From ff1979ba518a05181ee3e8c5b1ad0ec1decf0f31 Mon Sep 17 00:00:00 2001
From: Ramon <dev@ramonbesselink.nl>
Date: Mon, 27 Jul 2026 14:14:25 +0200
Subject: [PATCH] v0.7.10-beta - categorieen met kleur in de app store en bij
 je apps

- Nieuw core/categories.py: zeventien categorieen, elk met naam (nl/en), kleur
  en pictogram. Kleuren zijn middentonen die in licht en donker leesbaar zijn;
  de interface gebruikt ze als tekstkleur op een doorzichtige variant.
- Alle 96 apps ingedeeld via metadata.categories. Een app mag in meerdere
  categorieen zitten; 39 apps doen dat (Frigate onder domotica en media,
  Immich onder fotos en opslag, Kavita onder media en documenten).
- Apps uit externe repos geven geen categorieen op; die worden afgeleid uit
  tags en omschrijving, zodat ook zij een kleur en een plek in het filter
  krijgen.
- App store: gekleurde categoriebalk met aantallen, klikbare badges per app,
  werkt naast het bestaande zoekveld en de tagfilters.
- Stackslijst: dezelfde balk met alleen de categorieen die je draait, gekleurde
  rand per kaart en klikbare badges.
- Nieuw /api/categories geeft de definities met kleur, zodat interface en
  backend dezelfde kleur voor dezelfde categorie gebruiken. /api/stacks geeft
  de categorieen mee; een stack van voor deze versie valt terug op "overig"
  in plaats van kleurloos te blijven.
- Tests: elke app heeft geldige categorieen, kleuren zijn uniek, en er staat
  geen categorie in het filter zonder apps.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01C7oLCRYzY5ixJ5Sv8Y8EFb
---
 CHANGELOG.md                           |  39 +++++++++
 VERSION                                |   2 +-
 apps/actual-budget/template.json       |  19 ++++-
 apps/adguard-home/template.json        |  20 ++++-
 apps/arr-stack/template.json           |   6 +-
 apps/audiobookshelf/template.json      |   5 +-
 apps/authelia/template.json            |   5 +-
 apps/baby-buddy/template.json          |   5 +-
 apps/bambuddy/template.json            |   5 +-
 apps/baserow/template.json             |   6 +-
 apps/beszel/template.json              |   5 +-
 apps/bookstack/template.json           |   5 +-
 apps/caddy/template.json               |   6 +-
 apps/calibre-web/template.json         |   6 +-
 apps/changedetection-io/template.json  |  23 ++++-
 apps/cyberchef/template.json           |   6 +-
 apps/dozzle/template.json              |  20 ++++-
 apps/duplicati/template.json           |   5 +-
 apps/esphome/template.json             |   6 +-
 apps/excalidraw/template.json          |   5 +-
 apps/filebrowser/template.json         |  19 ++++-
 apps/firefly-iii/template.json         |   5 +-
 apps/focalboard/template.json          |   5 +-
 apps/forgejo-mcp/template.json         |  29 +++++--
 apps/forgejo/template.json             |  19 ++++-
 apps/freshrss/template.json            |   5 +-
 apps/frigate/template.json             |   6 +-
 apps/ghost/template.json               |  27 ++++--
 apps/gotify/template.json              |  23 ++++-
 apps/grafana/template.json             |  23 ++++-
 apps/grocy/template.json               |   5 +-
 apps/hedgedoc/template.json            |   6 +-
 apps/home-assistant/template.json      |  18 +++-
 apps/homeassistant-mcp/template.json   |  29 +++++--
 apps/homebridge/template.json          |   5 +-
 apps/homepage/template.json            |   5 +-
 apps/immich/template.json              |   6 +-
 apps/influxdb/template.json            |   6 +-
 apps/it-tools/template.json            |  19 ++++-
 apps/jellyfin/template.json            |  19 ++++-
 apps/jellyseerr/template.json          |   5 +-
 apps/karakeep/template.json            |   5 +-
 apps/kavita/template.json              |   6 +-
 apps/keycloak/template.json            |   5 +-
 apps/kimai/template.json               |   6 +-
 apps/komga/template.json               |   5 +-
 apps/kopia/template.json               |   5 +-
 apps/languagetool/template.json        |   6 +-
 apps/linkding/template.json            |  22 ++++-
 apps/mealie/template.json              |  19 ++++-
 apps/memos/template.json               |   6 +-
 apps/metabase/template.json            |   6 +-
 apps/metube/template.json              |   6 +-
 apps/miniflux/template.json            |  27 ++++--
 apps/mosquitto/template.json           |   6 +-
 apps/n8n/template.json                 |  23 ++++-
 apps/navidrome/template.json           |   5 +-
 apps/netdata/template.json             |   5 +-
 apps/nextcloud-aio/template.json       |  20 ++++-
 apps/nginx-proxy-manager/template.json |  19 ++++-
 apps/nocodb/template.json              |   6 +-
 apps/node-red/template.json            |   6 +-
 apps/ntfy/template.json                |   5 +-
 apps/octoprint/template.json           |   5 +-
 apps/ollama/template.json              |   5 +-
 apps/open-webui/template.json          |   5 +-
 apps/owntracks/template.json           |   6 +-
 apps/paperless-ngx/template.json       |  28 ++++--
 apps/photoprism/template.json          |   5 +-
 apps/pihole/template.json              |  24 +++++-
 apps/pinchflat/template.json           |   6 +-
 apps/planka/template.json              |   5 +-
 apps/plex/template.json                |  23 ++++-
 apps/portainer/template.json           |  18 +++-
 apps/prometheus/template.json          |   5 +-
 apps/qbittorrent/template.json         |  18 +++-
 apps/sabnzbd/template.json             |  19 ++++-
 apps/scrypted/template.json            |   6 +-
 apps/searxng/template.json             |   6 +-
 apps/shlink/template.json              |   6 +-
 apps/speedtest-tracker/template.json   |  24 +++++-
 apps/spoolman/template.json            |   5 +-
 apps/stirling-pdf/template.json        |  19 ++++-
 apps/syncthing/template.json           |  19 ++++-
 apps/tandoor/template.json             |   5 +-
 apps/technitium-dns/template.json      |   6 +-
 apps/teslamate/template.json           |   6 +-
 apps/traefik/template.json             |  24 +++++-
 apps/unifi-network/template.json       |  24 +++++-
 apps/uptime-kuma/template.json         |  18 +++-
 apps/vaultwarden/template.json         |  22 ++++-
 apps/vikunja/template.json             |  27 ++++--
 apps/wallabag/template.json            |   5 +-
 apps/watchtower/template.json          |   5 +-
 apps/wg-easy/template.json             |   6 +-
 apps/wikijs/template.json              |   5 +-
 apps/zigbee2mqtt/template.json         |   5 +-
 apps/zwave-js-ui/template.json         |   5 +-
 server-up/app.py                       |  17 +++-
 server-up/core/boilerplates.py         |  10 ++-
 server-up/core/categories.py           | 106 +++++++++++++++++++++++
 server-up/templates/index.html         | 110 ++++++++++++++++++++++--
 server-up/translations/en.json         |   4 +-
 server-up/translations/nl.json         |   4 +-
 tests/test_categories.py               | 113 +++++++++++++++++++++++++
 105 files changed, 1286 insertions(+), 200 deletions(-)
 create mode 100644 server-up/core/categories.py
 create mode 100644 tests/test_categories.py

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5eca7db..48ce5f5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,42 @@
+# v0.7.10-beta — Categorieën met kleur, in de app store en bij je apps
+
+Alle 96 apps zijn ingedeeld in zeventien categorieën, elk met een eigen kleur en
+pictogram. Een app mag in meerdere categorieën zitten: Frigate staat onder
+Domotica én Media, Immich onder Foto's én Opslag, Kavita onder Media én
+Documenten. Negenendertig apps vallen onder meer dan één.
+
+| | Categorie | | Categorie |
+|---|---|---|---|
+| 🟣 | Media | 🔵 | Netwerk |
+| 🩷 | Foto's | 🔴 | Beveiliging |
+| 🟢 | Downloaden | 🟠 | Opslag & backup |
+| 🟩 | Domotica | 🩵 | Documenten |
+| 🟦 | 3D-printen | 🟦 | Productiviteit |
+| 🔷 | Communicatie | 🟩 | Financiën |
+| 🌸 | Gezin & huishouden | 🟧 | Monitoring |
+| 🩵 | Ontwikkeling | 🟪 | AI |
+| ⬜ | Systeembeheer | | |
+
+**In de app store** staat een gekleurde categoriebalk met per categorie het
+aantal apps. Klikken filtert; het bestaande zoekveld en de tagfilters werken
+ernaast gewoon door. Elke app-kaart toont zijn categorieën als gekleurde badge,
+en klikken op zo'n badge filtert er meteen op.
+
+**Bij je geïnstalleerde apps** staat dezelfde balk, met alleen de categorieën die
+je daadwerkelijk draait. Elke stackkaart heeft een gekleurde rand in de kleur van
+zijn eerste categorie, plus dezelfde klikbare badges.
+
+Apps uit externe repo's (zoals de ChristianLempa-boilerplates) geven geen
+categorieën op. Die worden afgeleid uit hun tags en omschrijving, zodat ook zij
+een kleur en een plek in het filter krijgen in plaats van als naamloze groep
+buiten de indeling te vallen.
+
+Tests bewaken dat elke app minstens één geldige categorie heeft, dat de kleuren
+onderling verschillen, en dat er geen categorie in het filter staat waar geen
+enkele app onder valt.
+
+---
+
 # v0.7.00-beta — Apps koppelen, eenvoudiger instellen, geavanceerde opties verborgen
 
 ## 🔗 Apps kunnen elkaar nu bereiken
diff --git a/VERSION b/VERSION
index 771f51a..f7580d2 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.7.00-beta
+0.7.10-beta
diff --git a/apps/actual-budget/template.json b/apps/actual-budget/template.json
index 371ac78..2a7e0f6 100644
--- a/apps/actual-budget/template.json
+++ b/apps/actual-budget/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Actual Budget",
     "description": "Lokaal persoonlijk financieel beheer en budgettering zonder cloudafhankelijkheid.",
-    "tags": ["financiën", "budget", "persoonlijk", "privacy"],
-    "icon": {"provider": "selfhst", "id": "actual-budget"},
-    "version": {"name": "latest"}
+    "tags": [
+      "financiën",
+      "budget",
+      "persoonlijk",
+      "privacy"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "actual-budget"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "financien"
+    ]
   },
   "variables": [
     {
diff --git a/apps/adguard-home/template.json b/apps/adguard-home/template.json
index b335b7e..851a3c9 100644
--- a/apps/adguard-home/template.json
+++ b/apps/adguard-home/template.json
@@ -3,9 +3,23 @@
   "metadata": {
     "name": "AdGuard Home",
     "description": "DNS-level advertentie- en trackerblokkering voor het hele netwerk",
-    "tags": ["dns", "adblock", "netwerk", "privacy"],
-    "icon": {"provider": "selfhst", "id": "adguard-home"},
-    "version": {"name": "latest"}
+    "tags": [
+      "dns",
+      "adblock",
+      "netwerk",
+      "privacy"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "adguard-home"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "netwerk",
+      "beveiliging"
+    ]
   },
   "variables": [
     {
diff --git a/apps/arr-stack/template.json b/apps/arr-stack/template.json
index cee79ca..ab1b42b 100644
--- a/apps/arr-stack/template.json
+++ b/apps/arr-stack/template.json
@@ -16,7 +16,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "media",
+      "downloaden"
+    ]
   },
   "variables": [
     {
diff --git a/apps/audiobookshelf/template.json b/apps/audiobookshelf/template.json
index ae44b9f..b563aa2 100644
--- a/apps/audiobookshelf/template.json
+++ b/apps/audiobookshelf/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "media"
+    ]
   },
   "variables": [
     {
diff --git a/apps/authelia/template.json b/apps/authelia/template.json
index 92a1779..2a9652c 100644
--- a/apps/authelia/template.json
+++ b/apps/authelia/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "beveiliging"
+    ]
   },
   "variables": [
     {
diff --git a/apps/baby-buddy/template.json b/apps/baby-buddy/template.json
index 86aaba3..ca90458 100644
--- a/apps/baby-buddy/template.json
+++ b/apps/baby-buddy/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "gezin"
+    ]
   },
   "variables": [
     {
diff --git a/apps/bambuddy/template.json b/apps/bambuddy/template.json
index cbf0290..427984e 100644
--- a/apps/bambuddy/template.json
+++ b/apps/bambuddy/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "3d-printen"
+    ]
   },
   "variables": [
     {
diff --git a/apps/baserow/template.json b/apps/baserow/template.json
index 6c26f3f..7e746b0 100644
--- a/apps/baserow/template.json
+++ b/apps/baserow/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "ontwikkeling",
+      "productiviteit"
+    ]
   },
   "variables": [
     {
diff --git a/apps/beszel/template.json b/apps/beszel/template.json
index 9c8f173..75bc0eb 100644
--- a/apps/beszel/template.json
+++ b/apps/beszel/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "monitoring"
+    ]
   },
   "variables": [
     {
diff --git a/apps/bookstack/template.json b/apps/bookstack/template.json
index 890094a..612e86a 100644
--- a/apps/bookstack/template.json
+++ b/apps/bookstack/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "documenten"
+    ]
   },
   "variables": [
     {
diff --git a/apps/caddy/template.json b/apps/caddy/template.json
index 477bc98..cdd2a77 100644
--- a/apps/caddy/template.json
+++ b/apps/caddy/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "2"
-    }
+    },
+    "categories": [
+      "netwerk",
+      "beheer"
+    ]
   },
   "variables": [
     {
diff --git a/apps/calibre-web/template.json b/apps/calibre-web/template.json
index ac7c364..1ea48eb 100644
--- a/apps/calibre-web/template.json
+++ b/apps/calibre-web/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "media",
+      "documenten"
+    ]
   },
   "variables": [
     {
diff --git a/apps/changedetection-io/template.json b/apps/changedetection-io/template.json
index b119b76..b39905c 100644
--- a/apps/changedetection-io/template.json
+++ b/apps/changedetection-io/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Changedetection.io",
     "description": "Monitor websites op wijzigingen en ontvang meldingen zodra er iets verandert.",
-    "tags": ["monitoring", "websites", "alerting", "automatisering"],
-    "icon": {"provider": "selfhst", "id": "changedetection-io"},
-    "version": {"name": "latest"}
+    "tags": [
+      "monitoring",
+      "websites",
+      "alerting",
+      "automatisering"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "changedetection-io"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "monitoring"
+    ]
   },
   "variables": [
     {
@@ -44,7 +57,9 @@
           "default": "",
           "required": false,
           "description": "Optioneel wachtwoord om de webinterface te beveiligen. Laat leeg voor geen beveiliging.",
-          "config": {"placeholder": "sterk-wachtwoord"}
+          "config": {
+            "placeholder": "sterk-wachtwoord"
+          }
         }
       ]
     }
diff --git a/apps/cyberchef/template.json b/apps/cyberchef/template.json
index 5799d9d..19b1f3a 100644
--- a/apps/cyberchef/template.json
+++ b/apps/cyberchef/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "ontwikkeling",
+      "beveiliging"
+    ]
   },
   "variables": [
     {
diff --git a/apps/dozzle/template.json b/apps/dozzle/template.json
index fb0eba5..07d1168 100644
--- a/apps/dozzle/template.json
+++ b/apps/dozzle/template.json
@@ -3,9 +3,23 @@
   "metadata": {
     "name": "Dozzle",
     "description": "Realtime Docker container log viewer in je browser. Geen data opgeslagen, lichtgewicht.",
-    "tags": ["docker", "logs", "monitoring", "beheer"],
-    "icon": {"provider": "selfhst", "id": "dozzle"},
-    "version": {"name": "latest"}
+    "tags": [
+      "docker",
+      "logs",
+      "monitoring",
+      "beheer"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "dozzle"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "monitoring",
+      "beheer"
+    ]
   },
   "variables": [
     {
diff --git a/apps/duplicati/template.json b/apps/duplicati/template.json
index 76fb8fa..187f6cf 100644
--- a/apps/duplicati/template.json
+++ b/apps/duplicati/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "opslag"
+    ]
   },
   "variables": [
     {
diff --git a/apps/esphome/template.json b/apps/esphome/template.json
index 73cad3d..40688ef 100644
--- a/apps/esphome/template.json
+++ b/apps/esphome/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "stable"
-    }
+    },
+    "categories": [
+      "domotica",
+      "ontwikkeling"
+    ]
   },
   "variables": [
     {
diff --git a/apps/excalidraw/template.json b/apps/excalidraw/template.json
index 97a0a06..632e023 100644
--- a/apps/excalidraw/template.json
+++ b/apps/excalidraw/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "productiviteit"
+    ]
   },
   "variables": [
     {
diff --git a/apps/filebrowser/template.json b/apps/filebrowser/template.json
index 9aaa8cf..0d2a01a 100644
--- a/apps/filebrowser/template.json
+++ b/apps/filebrowser/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "File Browser",
     "description": "Webgebaseerde bestandsbeheerder voor je server: uploaden, downloaden, delen en bewerken.",
-    "tags": ["bestanden", "beheer", "cloud", "opslag"],
-    "icon": {"provider": "selfhst", "id": "filebrowser"},
-    "version": {"name": "latest"}
+    "tags": [
+      "bestanden",
+      "beheer",
+      "cloud",
+      "opslag"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "filebrowser"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "opslag"
+    ]
   },
   "variables": [
     {
diff --git a/apps/firefly-iii/template.json b/apps/firefly-iii/template.json
index 12010d2..cc4ab3c 100644
--- a/apps/firefly-iii/template.json
+++ b/apps/firefly-iii/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "financien"
+    ]
   },
   "variables": [
     {
diff --git a/apps/focalboard/template.json b/apps/focalboard/template.json
index 48c2a90..e906d08 100644
--- a/apps/focalboard/template.json
+++ b/apps/focalboard/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "productiviteit"
+    ]
   },
   "variables": [
     {
diff --git a/apps/forgejo-mcp/template.json b/apps/forgejo-mcp/template.json
index f873304..4b79764 100644
--- a/apps/forgejo-mcp/template.json
+++ b/apps/forgejo-mcp/template.json
@@ -3,9 +3,24 @@
   "metadata": {
     "name": "Forgejo MCP Server",
     "description": "MCP-server voor Forgejo en Gitea. Laat AI-assistenten zoals Claude je repositories, issues, pull requests en releases beheren via natuurlijke taal.",
-    "tags": ["mcp", "ai", "forgejo", "gitea", "claude"],
-    "icon": {"provider": "selfhst", "id": "forgejo"},
-    "version": {"name": "latest"}
+    "tags": [
+      "mcp",
+      "ai",
+      "forgejo",
+      "gitea",
+      "claude"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "forgejo"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "ontwikkeling",
+      "ai"
+    ]
   },
   "variables": [
     {
@@ -38,7 +53,9 @@
           "default": "https://jouw-forgejo-url",
           "required": true,
           "description": "Volledige URL van je Forgejo- of Gitea-instantie",
-          "config": {"placeholder": "https://git.example.com"}
+          "config": {
+            "placeholder": "https://git.example.com"
+          }
         },
         {
           "name": "forgejo_token",
@@ -47,7 +64,9 @@
           "default": "",
           "required": true,
           "description": "Maak een token aan via Forgejo → Instellingen → Toepassingen → Access Tokens. Geef minimaal 'repository' en 'issue' schrijfrechten.",
-          "config": {"placeholder": "jouw-api-token"}
+          "config": {
+            "placeholder": "jouw-api-token"
+          }
         }
       ]
     }
diff --git a/apps/forgejo/template.json b/apps/forgejo/template.json
index 9d97cc1..2a656bf 100644
--- a/apps/forgejo/template.json
+++ b/apps/forgejo/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Forgejo",
     "description": "Lichtgewicht zelfgehoste Git-server. Actief onderhouden community-fork van Gitea.",
-    "tags": ["git", "code", "versiebeheer", "ontwikkeling"],
-    "icon": {"provider": "selfhst", "id": "forgejo"},
-    "version": {"name": "latest"}
+    "tags": [
+      "git",
+      "code",
+      "versiebeheer",
+      "ontwikkeling"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "forgejo"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "ontwikkeling"
+    ]
   },
   "variables": [
     {
diff --git a/apps/freshrss/template.json b/apps/freshrss/template.json
index b82ec11..49f954b 100644
--- a/apps/freshrss/template.json
+++ b/apps/freshrss/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "documenten"
+    ]
   },
   "variables": [
     {
diff --git a/apps/frigate/template.json b/apps/frigate/template.json
index 07fd0e8..04ef78c 100644
--- a/apps/frigate/template.json
+++ b/apps/frigate/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "stable"
-    }
+    },
+    "categories": [
+      "domotica",
+      "media"
+    ]
   },
   "variables": [
     {
diff --git a/apps/ghost/template.json b/apps/ghost/template.json
index 3810ccc..0628192 100644
--- a/apps/ghost/template.json
+++ b/apps/ghost/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Ghost",
     "description": "Professioneel blogplatform en CMS met abonnementen, nieuwsbrieven en moderne editor.",
-    "tags": ["blog", "cms", "publiceren", "nieuwsbrief"],
-    "icon": {"provider": "selfhst", "id": "ghost"},
-    "version": {"name": "latest"}
+    "tags": [
+      "blog",
+      "cms",
+      "publiceren",
+      "nieuwsbrief"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "ghost"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "documenten"
+    ]
   },
   "variables": [
     {
@@ -44,7 +57,9 @@
           "default": "http://localhost",
           "required": true,
           "description": "Volledige URL van je Ghost-site, inclusief protocol",
-          "config": {"placeholder": "https://mijn-blog.nl"}
+          "config": {
+            "placeholder": "https://mijn-blog.nl"
+          }
         }
       ]
     },
@@ -57,7 +72,9 @@
           "title": "Database wachtwoord",
           "default": "ghost_db_pass",
           "required": true,
-          "config": {"placeholder": "sterk-wachtwoord"}
+          "config": {
+            "placeholder": "sterk-wachtwoord"
+          }
         }
       ]
     }
diff --git a/apps/gotify/template.json b/apps/gotify/template.json
index 683329b..56f4010 100644
--- a/apps/gotify/template.json
+++ b/apps/gotify/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Gotify",
     "description": "Eenvoudige push-notificatieserver voor je eigen apparaten, scripts en apps.",
-    "tags": ["notificaties", "push", "messaging", "alerts"],
-    "icon": {"provider": "selfhst", "id": "gotify"},
-    "version": {"name": "latest"}
+    "tags": [
+      "notificaties",
+      "push",
+      "messaging",
+      "alerts"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "gotify"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "communicatie"
+    ]
   },
   "variables": [
     {
@@ -44,7 +57,9 @@
           "default": "admin",
           "required": true,
           "description": "Wijzig dit na de eerste aanmelding",
-          "config": {"placeholder": "sterk-wachtwoord"}
+          "config": {
+            "placeholder": "sterk-wachtwoord"
+          }
         }
       ]
     }
diff --git a/apps/grafana/template.json b/apps/grafana/template.json
index 4466095..dd89dd8 100644
--- a/apps/grafana/template.json
+++ b/apps/grafana/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Grafana",
     "description": "Visualiseer metrics, logs en traces in aanpasbare dashboards.",
-    "tags": ["monitoring", "dashboards", "metrics", "visualisatie"],
-    "icon": {"provider": "selfhst", "id": "grafana"},
-    "version": {"name": "latest"}
+    "tags": [
+      "monitoring",
+      "dashboards",
+      "metrics",
+      "visualisatie"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "grafana"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "monitoring"
+    ]
   },
   "variables": [
     {
@@ -51,7 +64,9 @@
           "default": "admin",
           "required": true,
           "description": "Wijzig dit na de eerste aanmelding",
-          "config": {"placeholder": "sterk-wachtwoord"}
+          "config": {
+            "placeholder": "sterk-wachtwoord"
+          }
         }
       ]
     }
diff --git a/apps/grocy/template.json b/apps/grocy/template.json
index 0eb601e..f486ce3 100644
--- a/apps/grocy/template.json
+++ b/apps/grocy/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "gezin"
+    ]
   },
   "variables": [
     {
diff --git a/apps/hedgedoc/template.json b/apps/hedgedoc/template.json
index 14434b7..e4eba68 100644
--- a/apps/hedgedoc/template.json
+++ b/apps/hedgedoc/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "documenten",
+      "productiviteit"
+    ]
   },
   "variables": [
     {
diff --git a/apps/home-assistant/template.json b/apps/home-assistant/template.json
index a099c82..d09d334 100644
--- a/apps/home-assistant/template.json
+++ b/apps/home-assistant/template.json
@@ -3,9 +3,21 @@
   "metadata": {
     "name": "Home Assistant",
     "description": "Open-source domotica platform voor het automatiseren van je slimme huis.",
-    "tags": ["domotica", "smart-home", "automatisering"],
-    "icon": {"provider": "selfhst", "id": "home-assistant"},
-    "version": {"name": "stable"}
+    "tags": [
+      "domotica",
+      "smart-home",
+      "automatisering"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "home-assistant"
+    },
+    "version": {
+      "name": "stable"
+    },
+    "categories": [
+      "domotica"
+    ]
   },
   "variables": [
     {
diff --git a/apps/homeassistant-mcp/template.json b/apps/homeassistant-mcp/template.json
index b885722..205342a 100644
--- a/apps/homeassistant-mcp/template.json
+++ b/apps/homeassistant-mcp/template.json
@@ -3,9 +3,24 @@
   "metadata": {
     "name": "Home Assistant MCP Server",
     "description": "MCP-server voor Home Assistant. Laat AI-assistenten zoals Claude je slimme apparaten bedienen, automations beheren en statussen opvragen via natuurlijke taal.",
-    "tags": ["mcp", "ai", "home-assistant", "smarthome", "claude"],
-    "icon": {"provider": "selfhst", "id": "home-assistant"},
-    "version": {"name": "latest"}
+    "tags": [
+      "mcp",
+      "ai",
+      "home-assistant",
+      "smarthome",
+      "claude"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "home-assistant"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "domotica",
+      "ai"
+    ]
   },
   "variables": [
     {
@@ -45,7 +60,9 @@
           "default": "http://homeassistant:8123",
           "required": true,
           "description": "URL van je Home Assistant instantie",
-          "config": {"placeholder": "http://192.168.1.x:8123"}
+          "config": {
+            "placeholder": "http://192.168.1.x:8123"
+          }
         },
         {
           "name": "hass_token",
@@ -54,7 +71,9 @@
           "default": "",
           "required": true,
           "description": "Maak een token aan via Home Assistant → Profiel → Lange termijn toegangstokens (onderaan de pagina)",
-          "config": {"placeholder": "eyJ..."}
+          "config": {
+            "placeholder": "eyJ..."
+          }
         }
       ]
     }
diff --git a/apps/homebridge/template.json b/apps/homebridge/template.json
index 8f7d5e7..90e8a35 100644
--- a/apps/homebridge/template.json
+++ b/apps/homebridge/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "domotica"
+    ]
   },
   "variables": [
     {
diff --git a/apps/homepage/template.json b/apps/homepage/template.json
index bef6048..14f1715 100644
--- a/apps/homepage/template.json
+++ b/apps/homepage/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "beheer"
+    ]
   },
   "variables": [
     {
diff --git a/apps/immich/template.json b/apps/immich/template.json
index 892e659..a386079 100644
--- a/apps/immich/template.json
+++ b/apps/immich/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "release"
-    }
+    },
+    "categories": [
+      "fotos",
+      "opslag"
+    ]
   },
   "variables": [
     {
diff --git a/apps/influxdb/template.json b/apps/influxdb/template.json
index 41500db..90ed6f0 100644
--- a/apps/influxdb/template.json
+++ b/apps/influxdb/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "2"
-    }
+    },
+    "categories": [
+      "monitoring",
+      "ontwikkeling"
+    ]
   },
   "variables": [
     {
diff --git a/apps/it-tools/template.json b/apps/it-tools/template.json
index 64311ea..ce2adb1 100644
--- a/apps/it-tools/template.json
+++ b/apps/it-tools/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "IT-Tools",
     "description": "Verzameling handige online tools voor developers: encoding, hashing, formattering, converters en meer.",
-    "tags": ["tools", "developer", "utilities", "encoding"],
-    "icon": {"provider": "selfhst", "id": "it-tools"},
-    "version": {"name": "latest"}
+    "tags": [
+      "tools",
+      "developer",
+      "utilities",
+      "encoding"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "it-tools"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "ontwikkeling"
+    ]
   },
   "variables": [
     {
diff --git a/apps/jellyfin/template.json b/apps/jellyfin/template.json
index 5bcb16d..b8482ec 100644
--- a/apps/jellyfin/template.json
+++ b/apps/jellyfin/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Jellyfin",
     "description": "Gratis en open-source mediaserver voor films, series en muziek. Geen abonnement.",
-    "tags": ["media", "streaming", "films", "muziek"],
-    "icon": {"provider": "selfhst", "id": "jellyfin"},
-    "version": {"name": "latest"}
+    "tags": [
+      "media",
+      "streaming",
+      "films",
+      "muziek"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "jellyfin"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "media"
+    ]
   },
   "variables": [
     {
diff --git a/apps/jellyseerr/template.json b/apps/jellyseerr/template.json
index 31e516e..1226c06 100644
--- a/apps/jellyseerr/template.json
+++ b/apps/jellyseerr/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "media"
+    ]
   },
   "variables": [
     {
diff --git a/apps/karakeep/template.json b/apps/karakeep/template.json
index a61649b..ad850cd 100644
--- a/apps/karakeep/template.json
+++ b/apps/karakeep/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "release"
-    }
+    },
+    "categories": [
+      "documenten"
+    ]
   },
   "variables": [
     {
diff --git a/apps/kavita/template.json b/apps/kavita/template.json
index 901b30e..cfbaae9 100644
--- a/apps/kavita/template.json
+++ b/apps/kavita/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "media",
+      "documenten"
+    ]
   },
   "variables": [
     {
diff --git a/apps/keycloak/template.json b/apps/keycloak/template.json
index 2ad4b96..11b11da 100644
--- a/apps/keycloak/template.json
+++ b/apps/keycloak/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "beveiliging"
+    ]
   },
   "variables": [
     {
diff --git a/apps/kimai/template.json b/apps/kimai/template.json
index eb029f6..7059562 100644
--- a/apps/kimai/template.json
+++ b/apps/kimai/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "apache"
-    }
+    },
+    "categories": [
+      "productiviteit",
+      "financien"
+    ]
   },
   "variables": [
     {
diff --git a/apps/komga/template.json b/apps/komga/template.json
index c3425aa..be65e33 100644
--- a/apps/komga/template.json
+++ b/apps/komga/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "media"
+    ]
   },
   "variables": [
     {
diff --git a/apps/kopia/template.json b/apps/kopia/template.json
index 8af9d6c..8b1163f 100644
--- a/apps/kopia/template.json
+++ b/apps/kopia/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "opslag"
+    ]
   },
   "variables": [
     {
diff --git a/apps/languagetool/template.json b/apps/languagetool/template.json
index 52ea543..f8c6562 100644
--- a/apps/languagetool/template.json
+++ b/apps/languagetool/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "productiviteit",
+      "documenten"
+    ]
   },
   "variables": [
     {
diff --git a/apps/linkding/template.json b/apps/linkding/template.json
index 52b5d57..fc804c0 100644
--- a/apps/linkding/template.json
+++ b/apps/linkding/template.json
@@ -3,9 +3,21 @@
   "metadata": {
     "name": "Linkding",
     "description": "Eenvoudige zelfgehoste bladwijzerbeheerder met tags, zoekfunctie en browserextensie.",
-    "tags": ["bladwijzers", "links", "productiviteit"],
-    "icon": {"provider": "selfhst", "id": "linkding"},
-    "version": {"name": "latest"}
+    "tags": [
+      "bladwijzers",
+      "links",
+      "productiviteit"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "linkding"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "documenten"
+    ]
   },
   "variables": [
     {
@@ -50,7 +62,9 @@
           "title": "Admin wachtwoord",
           "default": "",
           "required": true,
-          "config": {"placeholder": "sterk-wachtwoord"}
+          "config": {
+            "placeholder": "sterk-wachtwoord"
+          }
         }
       ]
     }
diff --git a/apps/mealie/template.json b/apps/mealie/template.json
index ce53e49..4e5a9cd 100644
--- a/apps/mealie/template.json
+++ b/apps/mealie/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Mealie",
     "description": "Receptenbeheer met maaltijdplanning, boodschappenlijsten en automatisch importeren van recepten.",
-    "tags": ["recepten", "koken", "maaltijdplanning", "voedsel"],
-    "icon": {"provider": "selfhst", "id": "mealie"},
-    "version": {"name": "latest"}
+    "tags": [
+      "recepten",
+      "koken",
+      "maaltijdplanning",
+      "voedsel"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "mealie"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "gezin"
+    ]
   },
   "variables": [
     {
diff --git a/apps/memos/template.json b/apps/memos/template.json
index a8f33a2..570d3e1 100644
--- a/apps/memos/template.json
+++ b/apps/memos/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "stable"
-    }
+    },
+    "categories": [
+      "documenten",
+      "productiviteit"
+    ]
   },
   "variables": [
     {
diff --git a/apps/metabase/template.json b/apps/metabase/template.json
index f2b739c..b89f7bf 100644
--- a/apps/metabase/template.json
+++ b/apps/metabase/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "monitoring",
+      "ontwikkeling"
+    ]
   },
   "variables": [
     {
diff --git a/apps/metube/template.json b/apps/metube/template.json
index 3d68955..be5e2e4 100644
--- a/apps/metube/template.json
+++ b/apps/metube/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "media",
+      "downloaden"
+    ]
   },
   "variables": [
     {
diff --git a/apps/miniflux/template.json b/apps/miniflux/template.json
index 3c0802c..0a027ac 100644
--- a/apps/miniflux/template.json
+++ b/apps/miniflux/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Miniflux",
     "description": "Minimalistische en snelle RSS-lezer, zelfgehost met een opgeruimde interface.",
-    "tags": ["rss", "nieuws", "lezer", "feeds"],
-    "icon": {"provider": "selfhst", "id": "miniflux"},
-    "version": {"name": "latest"}
+    "tags": [
+      "rss",
+      "nieuws",
+      "lezer",
+      "feeds"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "miniflux"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "documenten"
+    ]
   },
   "variables": [
     {
@@ -50,7 +63,9 @@
           "title": "Admin wachtwoord",
           "default": "",
           "required": true,
-          "config": {"placeholder": "sterk-wachtwoord"}
+          "config": {
+            "placeholder": "sterk-wachtwoord"
+          }
         }
       ]
     },
@@ -63,7 +78,9 @@
           "title": "Database wachtwoord",
           "default": "miniflux_db_pass",
           "required": true,
-          "config": {"placeholder": "sterk-wachtwoord"}
+          "config": {
+            "placeholder": "sterk-wachtwoord"
+          }
         }
       ]
     }
diff --git a/apps/mosquitto/template.json b/apps/mosquitto/template.json
index 9644f16..8af4263 100644
--- a/apps/mosquitto/template.json
+++ b/apps/mosquitto/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "2"
-    }
+    },
+    "categories": [
+      "domotica",
+      "netwerk"
+    ]
   },
   "variables": [
     {
diff --git a/apps/n8n/template.json b/apps/n8n/template.json
index 3361263..de56886 100644
--- a/apps/n8n/template.json
+++ b/apps/n8n/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "n8n",
     "description": "No-code/low-code workflow automatisering. Zapier-alternatief met 400+ integraties.",
-    "tags": ["automatisering", "workflow", "integratie"],
-    "icon": {"provider": "selfhst", "id": "n8n"},
-    "version": {"name": "latest"}
+    "tags": [
+      "automatisering",
+      "workflow",
+      "integratie"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "n8n"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "productiviteit",
+      "ontwikkeling"
+    ]
   },
   "variables": [
     {
@@ -51,7 +64,9 @@
           "default": "localhost",
           "required": false,
           "description": "Hostname of IP van je server voor webhook-URLs. Gebruik je domeinnaam als je een reverse proxy hebt.",
-          "config": {"placeholder": "mijn-server.nl"}
+          "config": {
+            "placeholder": "mijn-server.nl"
+          }
         }
       ]
     }
diff --git a/apps/navidrome/template.json b/apps/navidrome/template.json
index 4a634f6..b3ee073 100644
--- a/apps/navidrome/template.json
+++ b/apps/navidrome/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "media"
+    ]
   },
   "variables": [
     {
diff --git a/apps/netdata/template.json b/apps/netdata/template.json
index 42f7c5e..c16e5fd 100644
--- a/apps/netdata/template.json
+++ b/apps/netdata/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "stable"
-    }
+    },
+    "categories": [
+      "monitoring"
+    ]
   },
   "variables": [
     {
diff --git a/apps/nextcloud-aio/template.json b/apps/nextcloud-aio/template.json
index 51f1492..ca01dfa 100644
--- a/apps/nextcloud-aio/template.json
+++ b/apps/nextcloud-aio/template.json
@@ -3,9 +3,23 @@
   "metadata": {
     "name": "Nextcloud AIO",
     "description": "Nextcloud All-in-One: één container beheert automatisch alle Nextcloud-componenten.",
-    "tags": ["bestanden", "cloud", "productiviteit", "samenwerken"],
-    "icon": {"provider": "selfhst", "id": "nextcloud"},
-    "version": {"name": "latest"}
+    "tags": [
+      "bestanden",
+      "cloud",
+      "productiviteit",
+      "samenwerken"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "nextcloud"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "opslag",
+      "documenten"
+    ]
   },
   "variables": [
     {
diff --git a/apps/nginx-proxy-manager/template.json b/apps/nginx-proxy-manager/template.json
index 0493aaf..9b993da 100644
--- a/apps/nginx-proxy-manager/template.json
+++ b/apps/nginx-proxy-manager/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Nginx Proxy Manager",
     "description": "Reverse proxy met automatische SSL-certificaten en eenvoudige webinterface",
-    "tags": ["proxy", "ssl", "netwerk"],
-    "icon": {"provider": "selfhst", "id": "nginx-proxy-manager"},
-    "version": {"name": "latest"}
+    "tags": [
+      "proxy",
+      "ssl",
+      "netwerk"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "nginx-proxy-manager"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "netwerk",
+      "beheer"
+    ]
   },
   "variables": [
     {
diff --git a/apps/nocodb/template.json b/apps/nocodb/template.json
index af57740..1abd31d 100644
--- a/apps/nocodb/template.json
+++ b/apps/nocodb/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "ontwikkeling",
+      "productiviteit"
+    ]
   },
   "variables": [
     {
diff --git a/apps/node-red/template.json b/apps/node-red/template.json
index 8ad2373..6104b0a 100644
--- a/apps/node-red/template.json
+++ b/apps/node-red/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "domotica",
+      "productiviteit"
+    ]
   },
   "variables": [
     {
diff --git a/apps/ntfy/template.json b/apps/ntfy/template.json
index f0efcb1..39d7dce 100644
--- a/apps/ntfy/template.json
+++ b/apps/ntfy/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "communicatie"
+    ]
   },
   "variables": [
     {
diff --git a/apps/octoprint/template.json b/apps/octoprint/template.json
index 88ebba3..ff772fb 100644
--- a/apps/octoprint/template.json
+++ b/apps/octoprint/template.json
@@ -13,7 +13,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "3d-printen"
+    ]
   },
   "variables": [
     {
diff --git a/apps/ollama/template.json b/apps/ollama/template.json
index d9682c7..a05205c 100644
--- a/apps/ollama/template.json
+++ b/apps/ollama/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "ai"
+    ]
   },
   "variables": [
     {
diff --git a/apps/open-webui/template.json b/apps/open-webui/template.json
index f075d52..47272d5 100644
--- a/apps/open-webui/template.json
+++ b/apps/open-webui/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "main"
-    }
+    },
+    "categories": [
+      "ai"
+    ]
   },
   "variables": [
     {
diff --git a/apps/owntracks/template.json b/apps/owntracks/template.json
index ba6b6f4..e7aeff7 100644
--- a/apps/owntracks/template.json
+++ b/apps/owntracks/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "gezin",
+      "beveiliging"
+    ]
   },
   "variables": [
     {
diff --git a/apps/paperless-ngx/template.json b/apps/paperless-ngx/template.json
index be4fb97..4edf41a 100644
--- a/apps/paperless-ngx/template.json
+++ b/apps/paperless-ngx/template.json
@@ -3,9 +3,23 @@
   "metadata": {
     "name": "Paperless-ngx",
     "description": "Digitaal documentbeheer met OCR, slimme tags en zoekfunctie.",
-    "tags": ["documenten", "ocr", "archief", "productiviteit"],
-    "icon": {"provider": "selfhst", "id": "paperless-ngx"},
-    "version": {"name": "latest"}
+    "tags": [
+      "documenten",
+      "ocr",
+      "archief",
+      "productiviteit"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "paperless-ngx"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "documenten",
+      "opslag"
+    ]
   },
   "variables": [
     {
@@ -51,7 +65,9 @@
           "default": "",
           "required": true,
           "description": "Willekeurige lange string voor sessiebeveiliging",
-          "config": {"placeholder": "minimaal-50-willekeurige-tekens"}
+          "config": {
+            "placeholder": "minimaal-50-willekeurige-tekens"
+          }
         },
         {
           "name": "db_password",
@@ -59,7 +75,9 @@
           "title": "Database wachtwoord",
           "default": "paperless_db_pass",
           "required": true,
-          "config": {"placeholder": "sterk-wachtwoord"}
+          "config": {
+            "placeholder": "sterk-wachtwoord"
+          }
         }
       ]
     },
diff --git a/apps/photoprism/template.json b/apps/photoprism/template.json
index 0d38924..1639cd1 100644
--- a/apps/photoprism/template.json
+++ b/apps/photoprism/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "fotos"
+    ]
   },
   "variables": [
     {
diff --git a/apps/pihole/template.json b/apps/pihole/template.json
index 93d4bf5..84740af 100644
--- a/apps/pihole/template.json
+++ b/apps/pihole/template.json
@@ -3,9 +3,23 @@
   "metadata": {
     "name": "Pi-hole",
     "description": "DNS-gebaseerde advertentie- en trackerblokkering voor je hele thuisnetwerk.",
-    "tags": ["dns", "adblock", "privacy", "netwerk"],
-    "icon": {"provider": "selfhst", "id": "pi-hole"},
-    "version": {"name": "latest"}
+    "tags": [
+      "dns",
+      "adblock",
+      "privacy",
+      "netwerk"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "pi-hole"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "netwerk",
+      "beveiliging"
+    ]
   },
   "variables": [
     {
@@ -59,7 +73,9 @@
           "default": "",
           "required": true,
           "description": "Wachtwoord voor het Pi-hole webpaneel",
-          "config": {"placeholder": "sterk-wachtwoord"}
+          "config": {
+            "placeholder": "sterk-wachtwoord"
+          }
         }
       ]
     }
diff --git a/apps/pinchflat/template.json b/apps/pinchflat/template.json
index 88f31d3..b3191db 100644
--- a/apps/pinchflat/template.json
+++ b/apps/pinchflat/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "media",
+      "downloaden"
+    ]
   },
   "variables": [
     {
diff --git a/apps/planka/template.json b/apps/planka/template.json
index 9c4ca43..932d396 100644
--- a/apps/planka/template.json
+++ b/apps/planka/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "1"
-    }
+    },
+    "categories": [
+      "productiviteit"
+    ]
   },
   "variables": [
     {
diff --git a/apps/plex/template.json b/apps/plex/template.json
index 558ea25..a88adbb 100644
--- a/apps/plex/template.json
+++ b/apps/plex/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Plex",
     "description": "Populaire mediaserver voor films, series, muziek en foto's met apps voor alle platforms.",
-    "tags": ["media", "streaming", "films", "muziek"],
-    "icon": {"provider": "selfhst", "id": "plex"},
-    "version": {"name": "latest"}
+    "tags": [
+      "media",
+      "streaming",
+      "films",
+      "muziek"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "plex"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "media"
+    ]
   },
   "variables": [
     {
@@ -86,7 +99,9 @@
           "default": "",
           "required": false,
           "description": "Haal op via plex.tv/claim om de server direct aan je account te koppelen. Verlopen na 4 minuten.",
-          "config": {"placeholder": "claim-xxxxxxxxxxxxxxxxxxxx"}
+          "config": {
+            "placeholder": "claim-xxxxxxxxxxxxxxxxxxxx"
+          }
         }
       ]
     }
diff --git a/apps/portainer/template.json b/apps/portainer/template.json
index 252db56..072a3e5 100644
--- a/apps/portainer/template.json
+++ b/apps/portainer/template.json
@@ -3,9 +3,21 @@
   "metadata": {
     "name": "Portainer CE",
     "description": "Webgebaseerde Docker-beheerinterface voor containers, images, volumes en netwerken.",
-    "tags": ["docker", "beheer", "containers"],
-    "icon": {"provider": "selfhst", "id": "portainer"},
-    "version": {"name": "latest"}
+    "tags": [
+      "docker",
+      "beheer",
+      "containers"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "portainer"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "beheer"
+    ]
   },
   "variables": [
     {
diff --git a/apps/prometheus/template.json b/apps/prometheus/template.json
index 0ff159c..f7f9edf 100644
--- a/apps/prometheus/template.json
+++ b/apps/prometheus/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "monitoring"
+    ]
   },
   "variables": [
     {
diff --git a/apps/qbittorrent/template.json b/apps/qbittorrent/template.json
index e8e544d..9f7a4b8 100644
--- a/apps/qbittorrent/template.json
+++ b/apps/qbittorrent/template.json
@@ -3,9 +3,21 @@
   "metadata": {
     "name": "qBittorrent",
     "description": "Open-source torrent-client met webinterface. Werkt goed samen met de ARR-stack.",
-    "tags": ["downloaden", "torrents", "media"],
-    "icon": {"provider": "selfhst", "id": "qbittorrent"},
-    "version": {"name": "latest"}
+    "tags": [
+      "downloaden",
+      "torrents",
+      "media"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "qbittorrent"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "downloaden"
+    ]
   },
   "variables": [
     {
diff --git a/apps/sabnzbd/template.json b/apps/sabnzbd/template.json
index fde1301..b5dc46e 100644
--- a/apps/sabnzbd/template.json
+++ b/apps/sabnzbd/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "SABnzbd",
     "description": "Usenet download-client met webinterface. Werkt samen met de ARR-stack voor automatisch downloaden via Usenet.",
-    "tags": ["downloaden", "usenet", "nzb", "media"],
-    "icon": {"provider": "selfhst", "id": "sabnzbd"},
-    "version": {"name": "latest"}
+    "tags": [
+      "downloaden",
+      "usenet",
+      "nzb",
+      "media"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "sabnzbd"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "downloaden"
+    ]
   },
   "variables": [
     {
diff --git a/apps/scrypted/template.json b/apps/scrypted/template.json
index 773cc67..b5f0990 100644
--- a/apps/scrypted/template.json
+++ b/apps/scrypted/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "domotica",
+      "media"
+    ]
   },
   "variables": [
     {
diff --git a/apps/searxng/template.json b/apps/searxng/template.json
index 4281f8e..f611460 100644
--- a/apps/searxng/template.json
+++ b/apps/searxng/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "netwerk",
+      "beveiliging"
+    ]
   },
   "variables": [
     {
diff --git a/apps/shlink/template.json b/apps/shlink/template.json
index 829537a..af019ba 100644
--- a/apps/shlink/template.json
+++ b/apps/shlink/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "stable"
-    }
+    },
+    "categories": [
+      "netwerk",
+      "ontwikkeling"
+    ]
   },
   "variables": [
     {
diff --git a/apps/speedtest-tracker/template.json b/apps/speedtest-tracker/template.json
index cedc133..b49b92f 100644
--- a/apps/speedtest-tracker/template.json
+++ b/apps/speedtest-tracker/template.json
@@ -3,9 +3,23 @@
   "metadata": {
     "name": "Speedtest Tracker",
     "description": "Automatische internetsnelheidsmetingen met historische grafieken en statistieken.",
-    "tags": ["netwerk", "monitoring", "internet", "statistieken"],
-    "icon": {"provider": "selfhst", "id": "speedtest-tracker"},
-    "version": {"name": "latest"}
+    "tags": [
+      "netwerk",
+      "monitoring",
+      "internet",
+      "statistieken"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "speedtest-tracker"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "netwerk",
+      "monitoring"
+    ]
   },
   "variables": [
     {
@@ -72,7 +86,9 @@
           "default": "",
           "required": true,
           "description": "Willekeurige 32-tekens encryptiesleutel, bijv. base64:xxxx...",
-          "config": {"placeholder": "base64:willekeurige-string-van-32-tekens"}
+          "config": {
+            "placeholder": "base64:willekeurige-string-van-32-tekens"
+          }
         }
       ]
     }
diff --git a/apps/spoolman/template.json b/apps/spoolman/template.json
index 3549b95..21e7756 100644
--- a/apps/spoolman/template.json
+++ b/apps/spoolman/template.json
@@ -13,7 +13,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "3d-printen"
+    ]
   },
   "variables": [
     {
diff --git a/apps/stirling-pdf/template.json b/apps/stirling-pdf/template.json
index e06c730..36ce866 100644
--- a/apps/stirling-pdf/template.json
+++ b/apps/stirling-pdf/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Stirling PDF",
     "description": "Web-gebaseerde PDF-tools: samenvoegen, splitsen, omzetten, comprimeren en bewerken.",
-    "tags": ["pdf", "tools", "documenten", "utilities"],
-    "icon": {"provider": "selfhst", "id": "stirling-pdf"},
-    "version": {"name": "latest"}
+    "tags": [
+      "pdf",
+      "tools",
+      "documenten",
+      "utilities"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "stirling-pdf"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "documenten"
+    ]
   },
   "variables": [
     {
diff --git a/apps/syncthing/template.json b/apps/syncthing/template.json
index de4acf9..d9fe6dd 100644
--- a/apps/syncthing/template.json
+++ b/apps/syncthing/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Syncthing",
     "description": "Gedecentraliseerde bestandssynchronisatie tussen apparaten zonder cloudopslag.",
-    "tags": ["sync", "bestanden", "backup", "privacy"],
-    "icon": {"provider": "selfhst", "id": "syncthing"},
-    "version": {"name": "latest"}
+    "tags": [
+      "sync",
+      "bestanden",
+      "backup",
+      "privacy"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "syncthing"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "opslag"
+    ]
   },
   "variables": [
     {
diff --git a/apps/tandoor/template.json b/apps/tandoor/template.json
index 9c906a1..fee7b86 100644
--- a/apps/tandoor/template.json
+++ b/apps/tandoor/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "gezin"
+    ]
   },
   "variables": [
     {
diff --git a/apps/technitium-dns/template.json b/apps/technitium-dns/template.json
index c149dc9..68b501e 100644
--- a/apps/technitium-dns/template.json
+++ b/apps/technitium-dns/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "netwerk",
+      "beveiliging"
+    ]
   },
   "variables": [
     {
diff --git a/apps/teslamate/template.json b/apps/teslamate/template.json
index 4d83a2b..43bf46a 100644
--- a/apps/teslamate/template.json
+++ b/apps/teslamate/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "gezin",
+      "monitoring"
+    ]
   },
   "variables": [
     {
diff --git a/apps/traefik/template.json b/apps/traefik/template.json
index d6b84c7..5598928 100644
--- a/apps/traefik/template.json
+++ b/apps/traefik/template.json
@@ -3,9 +3,23 @@
   "metadata": {
     "name": "Traefik",
     "description": "Moderne reverse proxy en load balancer met automatische SSL via Let's Encrypt.",
-    "tags": ["reverse-proxy", "ssl", "netwerk", "loadbalancer"],
-    "icon": {"provider": "selfhst", "id": "traefik"},
-    "version": {"name": "latest"}
+    "tags": [
+      "reverse-proxy",
+      "ssl",
+      "netwerk",
+      "loadbalancer"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "traefik"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "netwerk",
+      "beheer"
+    ]
   },
   "variables": [
     {
@@ -58,7 +72,9 @@
           "default": "",
           "required": false,
           "description": "E-mailadres voor Let's Encrypt SSL-certificaten. Laat leeg als je geen HTTPS gebruikt.",
-          "config": {"placeholder": "jij@voorbeeld.nl"}
+          "config": {
+            "placeholder": "jij@voorbeeld.nl"
+          }
         }
       ]
     }
diff --git a/apps/unifi-network/template.json b/apps/unifi-network/template.json
index bca8882..0498475 100644
--- a/apps/unifi-network/template.json
+++ b/apps/unifi-network/template.json
@@ -3,9 +3,23 @@
   "metadata": {
     "name": "Unifi Network Application",
     "description": "Unifi netwerkconfiguratie en -beheer. Beheert access points, switches en gateways van Ubiquiti.",
-    "tags": ["netwerk", "unifi", "ubiquiti", "wifi"],
-    "icon": {"provider": "selfhst", "id": "unifi"},
-    "version": {"name": "latest"}
+    "tags": [
+      "netwerk",
+      "unifi",
+      "ubiquiti",
+      "wifi"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "unifi"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "netwerk",
+      "beheer"
+    ]
   },
   "variables": [
     {
@@ -98,7 +112,9 @@
           "default": "unifi_mongo_pass",
           "required": true,
           "description": "Wachtwoord voor de interne MongoDB database",
-          "config": {"placeholder": "sterk-wachtwoord"}
+          "config": {
+            "placeholder": "sterk-wachtwoord"
+          }
         }
       ]
     }
diff --git a/apps/uptime-kuma/template.json b/apps/uptime-kuma/template.json
index dd3978b..e8f23c3 100644
--- a/apps/uptime-kuma/template.json
+++ b/apps/uptime-kuma/template.json
@@ -3,9 +3,21 @@
   "metadata": {
     "name": "Uptime Kuma",
     "description": "Mooie en eenvoudige uptime-monitor voor al je services en websites.",
-    "tags": ["monitoring", "uptime", "alerting"],
-    "icon": {"provider": "selfhst", "id": "uptime-kuma"},
-    "version": {"name": "latest"}
+    "tags": [
+      "monitoring",
+      "uptime",
+      "alerting"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "uptime-kuma"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "monitoring"
+    ]
   },
   "variables": [
     {
diff --git a/apps/vaultwarden/template.json b/apps/vaultwarden/template.json
index c4ffe99..94f40b8 100644
--- a/apps/vaultwarden/template.json
+++ b/apps/vaultwarden/template.json
@@ -3,9 +3,21 @@
   "metadata": {
     "name": "Vaultwarden",
     "description": "Lichtgewicht Bitwarden-compatibele wachtwoordkluis. Werkt met alle Bitwarden-apps.",
-    "tags": ["wachtwoorden", "beveiliging", "privacy"],
-    "icon": {"provider": "selfhst", "id": "vaultwarden"},
-    "version": {"name": "latest"}
+    "tags": [
+      "wachtwoorden",
+      "beveiliging",
+      "privacy"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "vaultwarden"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "beveiliging"
+    ]
   },
   "variables": [
     {
@@ -51,7 +63,9 @@
           "default": "",
           "required": false,
           "description": "Willekeurige geheime string voor het /admin paneel. Laat leeg om admin uit te schakelen.",
-          "config": {"placeholder": "willekeurige-geheime-string"}
+          "config": {
+            "placeholder": "willekeurige-geheime-string"
+          }
         }
       ]
     }
diff --git a/apps/vikunja/template.json b/apps/vikunja/template.json
index 09dcdd8..c6de82a 100644
--- a/apps/vikunja/template.json
+++ b/apps/vikunja/template.json
@@ -3,9 +3,22 @@
   "metadata": {
     "name": "Vikunja",
     "description": "Open-source taakbeheer en to-do app met projecten, teams, Kanban en kalenderweergave.",
-    "tags": ["taken", "productiviteit", "projectbeheer", "todo"],
-    "icon": {"provider": "selfhst", "id": "vikunja"},
-    "version": {"name": "latest"}
+    "tags": [
+      "taken",
+      "productiviteit",
+      "projectbeheer",
+      "todo"
+    ],
+    "icon": {
+      "provider": "selfhst",
+      "id": "vikunja"
+    },
+    "version": {
+      "name": "latest"
+    },
+    "categories": [
+      "productiviteit"
+    ]
   },
   "variables": [
     {
@@ -51,7 +64,9 @@
           "default": "",
           "required": true,
           "description": "Willekeurige geheime string voor JWT-tokenbeveiliging",
-          "config": {"placeholder": "willekeurige-lange-string"}
+          "config": {
+            "placeholder": "willekeurige-lange-string"
+          }
         },
         {
           "name": "db_password",
@@ -59,7 +74,9 @@
           "title": "Database wachtwoord",
           "default": "vikunja_db_pass",
           "required": true,
-          "config": {"placeholder": "sterk-wachtwoord"}
+          "config": {
+            "placeholder": "sterk-wachtwoord"
+          }
         }
       ]
     }
diff --git a/apps/wallabag/template.json b/apps/wallabag/template.json
index 79ab782..879608a 100644
--- a/apps/wallabag/template.json
+++ b/apps/wallabag/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "documenten"
+    ]
   },
   "variables": [
     {
diff --git a/apps/watchtower/template.json b/apps/watchtower/template.json
index cde684e..6843431 100644
--- a/apps/watchtower/template.json
+++ b/apps/watchtower/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "beheer"
+    ]
   },
   "variables": [
     {
diff --git a/apps/wg-easy/template.json b/apps/wg-easy/template.json
index 50eaa1e..44c6fdf 100644
--- a/apps/wg-easy/template.json
+++ b/apps/wg-easy/template.json
@@ -14,7 +14,11 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "netwerk",
+      "beveiliging"
+    ]
   },
   "variables": [
     {
diff --git a/apps/wikijs/template.json b/apps/wikijs/template.json
index 05eedcf..75be0e2 100644
--- a/apps/wikijs/template.json
+++ b/apps/wikijs/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "2"
-    }
+    },
+    "categories": [
+      "documenten"
+    ]
   },
   "variables": [
     {
diff --git a/apps/zigbee2mqtt/template.json b/apps/zigbee2mqtt/template.json
index a3817ed..fa8c0bb 100644
--- a/apps/zigbee2mqtt/template.json
+++ b/apps/zigbee2mqtt/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "domotica"
+    ]
   },
   "variables": [
     {
diff --git a/apps/zwave-js-ui/template.json b/apps/zwave-js-ui/template.json
index d8ccc54..728fbcb 100644
--- a/apps/zwave-js-ui/template.json
+++ b/apps/zwave-js-ui/template.json
@@ -14,7 +14,10 @@
     },
     "version": {
       "name": "latest"
-    }
+    },
+    "categories": [
+      "domotica"
+    ]
   },
   "variables": [
     {
diff --git a/server-up/app.py b/server-up/app.py
index 6f41dfd..2da016a 100644
--- a/server-up/app.py
+++ b/server-up/app.py
@@ -15,7 +15,8 @@ from flask import Flask, Response, jsonify, render_template, request, session
 import core as cfg
 from core import audit, jobs, i18n
 from core import auth, docker, git, boilerplates, updater
-from core import backups, compose_transform, networks, scheduler, selfupdate
+from core import backups, categories, compose_transform, networks
+from core import scheduler, selfupdate
 from core import stackupdates
 from core.modules import Module, CORE, discover
 
@@ -618,6 +619,10 @@ def api_stacks():
             "containers": ct,
             "logo_url": logo_url, "icon": icon,
             "network": meta.get("network", ""), "ip": meta.get("ip", ""),
+            # Bij installatie vastgelegd; ontbreekt dat (oudere installatie),
+            # dan leiden we het alsnog af uit de opgeslagen naam.
+            "categories": categories.normalize(
+                meta.get("categories"), meta.get("tags"), meta.get("name", "")),
         })
     return jsonify(out)
 
@@ -1306,6 +1311,8 @@ def api_store_install():
                     "network": net_name,
                     "ip": net_ip if net else "",
                     "connected": bool(verbinden and gedeeld_net),
+                    "categories": meta.get("categories") or [],
+                    "tags": meta.get("tags") or [],
                 }, ensure_ascii=False, indent=2), encoding="utf-8")
             except Exception:
                 pass
@@ -1502,6 +1509,14 @@ def api_networks():
                    drivers=list(networks.DRIVERS))
 
 
+@app.route("/api/categories")
+def api_categories():
+    """Categoriedefinities met hun kleur, zodat de interface overal dezelfde
+    kleur gebruikt voor dezelfde categorie."""
+    lang = (request.args.get("lang") or cfg.load().get("LANGUAGE") or "nl")[:5]
+    return jsonify(categories=categories.all_categories(lang))
+
+
 @app.route("/api/apps/connectable")
 def api_connectable():
     """Ge<0x00ef>nstalleerde apps waar een nieuwe app aan gekoppeld kan worden.
diff --git a/server-up/core/boilerplates.py b/server-up/core/boilerplates.py
index f849bcf..7754593 100644
--- a/server-up/core/boilerplates.py
+++ b/server-up/core/boilerplates.py
@@ -56,10 +56,16 @@ def metadata(d: Path) -> dict:
             icon_url = f"https://cdn.jsdelivr.net/gh/walkxcode/dashboard-icons/png/{iid}.png"
         elif iid and (iid.startswith("http://") or iid.startswith("https://")):
             icon_url = iid
+    from core import categories as cat
+    tags = md.get("tags", []) or []
+    beschrijving = md.get("description", "")
     return {
         "name": md.get("name") or d.name,
-        "description": md.get("description", ""),
-        "tags": md.get("tags", []) or [],
+        "description": beschrijving,
+        "tags": tags,
+        # Expliciet in template.json, anders afgeleid uit de tags. Zo krijgen
+        # ook apps uit externe repo's een zinnige indeling.
+        "categories": cat.normalize(md.get("categories"), tags, beschrijving),
         "logo_url": icon_url,
         "version": (md.get("version") or {}).get("name", ""),
         "kind": t.get("kind", "compose"),
diff --git a/server-up/core/categories.py b/server-up/core/categories.py
new file mode 100644
index 0000000..4312416
--- /dev/null
+++ b/server-up/core/categories.py
@@ -0,0 +1,106 @@
+"""Categorieën voor apps, met een kleur per categorie.
+
+Een app hoort bij één of meer categorieën. Ze staan in `template.json` onder
+`metadata.categories`; ontbreken ze — bijvoorbeeld bij een externe repo als de
+ChristianLempa-boilerplates — dan worden ze afgeleid uit de tags.
+
+De kleuren zijn middentonen die zowel op een lichte als op een donkere
+achtergrond leesbaar blijven. De interface gebruikt ze als tekstkleur op een
+doorzichtige variant van dezelfde kleur.
+"""
+from __future__ import annotations
+
+# id → (naam NL, naam EN, kleur, mdi-icoon)
+CATEGORIES: dict[str, dict] = {
+    "media":          {"nl": "Media",            "en": "Media",            "color": "#8b5cf6", "icon": "mdi-play-circle-outline"},
+    "fotos":          {"nl": "Foto's",           "en": "Photos",           "color": "#ec4899", "icon": "mdi-image-multiple-outline"},
+    "downloaden":     {"nl": "Downloaden",       "en": "Downloads",        "color": "#84cc16", "icon": "mdi-download-outline"},
+    "domotica":       {"nl": "Domotica",         "en": "Home automation",  "color": "#22c55e", "icon": "mdi-home-automation"},
+    "3d-printen":     {"nl": "3D-printen",       "en": "3D printing",      "color": "#14b8a6", "icon": "mdi-printer-3d-nozzle-outline"},
+    "netwerk":        {"nl": "Netwerk",          "en": "Network",          "color": "#3b82f6", "icon": "mdi-lan"},
+    "beveiliging":    {"nl": "Beveiliging",      "en": "Security",         "color": "#ef4444", "icon": "mdi-shield-lock-outline"},
+    "opslag":         {"nl": "Opslag & backup",  "en": "Storage & backup", "color": "#f59e0b", "icon": "mdi-harddisk"},
+    "documenten":     {"nl": "Documenten",       "en": "Documents",        "color": "#0891b2", "icon": "mdi-file-document-outline"},
+    "productiviteit": {"nl": "Productiviteit",   "en": "Productivity",     "color": "#6366f1", "icon": "mdi-checkbox-marked-outline"},
+    "communicatie":   {"nl": "Communicatie",     "en": "Communication",    "color": "#0ea5e9", "icon": "mdi-message-outline"},
+    "financien":      {"nl": "Financiën",        "en": "Finance",          "color": "#10b981", "icon": "mdi-cash-multiple"},
+    "gezin":          {"nl": "Gezin & huishouden", "en": "Family & home",  "color": "#f472b6", "icon": "mdi-home-heart"},
+    "monitoring":     {"nl": "Monitoring",       "en": "Monitoring",       "color": "#f97316", "icon": "mdi-chart-line"},
+    "ontwikkeling":   {"nl": "Ontwikkeling",     "en": "Development",      "color": "#06b6d4", "icon": "mdi-code-braces"},
+    "ai":             {"nl": "AI",               "en": "AI",               "color": "#a855f7", "icon": "mdi-brain"},
+    "beheer":         {"nl": "Systeembeheer",    "en": "System management", "color": "#64748b", "icon": "mdi-cog-outline"},
+    "overig":         {"nl": "Overig",           "en": "Other",            "color": "#94a3b8", "icon": "mdi-shape-outline"},
+}
+
+DEFAULT = "overig"
+
+# Trefwoorden in tags of omschrijving → categorie. Wordt alleen gebruikt als een
+# template zelf geen categorieën opgeeft, zoals bij externe repo's.
+_TREFWOORDEN: list[tuple[tuple[str, ...], str]] = [
+    (("film", "serie", "media", "muziek", "video", "streaming", "luisterboek",
+      "podcast", "strips", "manga", "boeken", "ebooks", "verzoeken"), "media"),
+    (("foto", "fotos", "photos"), "fotos"),
+    (("download", "torrent", "usenet", "nzb"), "downloaden"),
+    (("domotica", "smart-home", "zigbee", "zwave", "mqtt", "esp32", "homekit",
+      "automatisering", "camera", "nvr"), "domotica"),
+    (("3d-printen", "bambu-lab", "printerbeheer"), "3d-printen"),
+    (("netwerk", "dns", "vpn", "proxy", "https", "links", "web"), "netwerk"),
+    (("beveiliging", "wachtwoorden", "sso", "authenticatie", "oidc", "privacy"), "beveiliging"),
+    (("backup", "opslag", "bestanden", "sync", "archief", "versleuteling"), "opslag"),
+    (("documentatie", "wiki", "kennis", "documenten", "pdf", "notities",
+      "markdown", "lezen", "artikelen", "bladwijzers", "rss", "nieuws"), "documenten"),
+    (("productiviteit", "taken", "projecten", "kanban", "uren", "planning",
+      "schrijven", "samenwerken", "tekenen", "diagram"), "productiviteit"),
+    (("meldingen", "push", "chat", "communicatie", "e-mail"), "communicatie"),
+    (("financien", "budget", "administratie"), "financien"),
+    (("gezin", "huishouden", "recepten", "voorraad", "gezondheid", "logboek"), "gezin"),
+    (("monitoring", "metrics", "systeem", "dashboard", "statistiek",
+      "realtime", "rapportage"), "monitoring"),
+    (("git", "ontwikkelaar", "code", "ci", "database", "spreadsheet",
+      "no-code", "encoding"), "ontwikkeling"),
+    (("ai", "llm", "machine-learning"), "ai"),
+    (("beheer", "docker", "containers", "updates", "onderhoud",
+      "infrastructuur", "startpagina", "overzicht"), "beheer"),
+]
+
+
+def all_categories(lang: str = "nl") -> list[dict]:
+    """Alle categorieën, in de vaste volgorde van CATEGORIES."""
+    return [{"id": cid, "name": c.get(lang) or c["nl"],
+             "color": c["color"], "icon": c["icon"]}
+            for cid, c in CATEGORIES.items()]
+
+
+def derive(tags, description: str = "") -> list[str]:
+    """Leid categorieën af uit tags en omschrijving.
+
+    Voor apps uit externe repo's die zelf geen categorieën opgeven.
+    """
+    hooi = " ".join(str(t).lower() for t in (tags or []))
+    hooi += " " + (description or "").lower()
+    gevonden: list[str] = []
+    for woorden, cat in _TREFWOORDEN:
+        if cat in gevonden:
+            continue
+        if any(w in hooi for w in woorden):
+            gevonden.append(cat)
+    return gevonden[:3] or [DEFAULT]
+
+
+def normalize(waarde, tags=None, description: str = "") -> list[str]:
+    """Maak er een geldige, ontdubbelde lijst categorie-ids van."""
+    uit: list[str] = []
+    for c in (waarde or []):
+        c = str(c).strip().lower()
+        if c in CATEGORIES and c not in uit:
+            uit.append(c)
+    return uit or derive(tags, description)
+
+
+def color(cid: str) -> str:
+    return CATEGORIES.get(cid, CATEGORIES[DEFAULT])["color"]
+
+
+def name(cid: str, lang: str = "nl") -> str:
+    c = CATEGORIES.get(cid, CATEGORIES[DEFAULT])
+    return c.get(lang) or c["nl"]
diff --git a/server-up/templates/index.html b/server-up/templates/index.html
index 0678d19..8f45653 100644
--- a/server-up/templates/index.html
+++ b/server-up/templates/index.html
@@ -256,9 +256,27 @@ tailwind.config = {
             <span x-text="t('check_updates')">Updates controleren</span>
           </button>
         </div>
+
+        <!-- Categorieën van wat je hebt draaien; klikken filtert. -->
+        <div class="flex flex-wrap gap-1.5 mb-5" x-show="stackCategories.length">
+          <button class="text-[11px] font-semibold px-2.5 py-1 rounded-lg border transition"
+                  :class="!stackCat ? 'border-ac bg-ac/10 text-ac dark:text-ac-dark' : 'border-bd dark:border-bd-dark text-t2 dark:text-t2-dark hover:border-bd2'"
+                  @click="stackCat = ''" x-text="t('all')">Alle</button>
+          <template x-for="c in stackCategories" :key="c.id">
+            <button class="text-[11px] font-semibold px-2.5 py-1 rounded-lg border transition inline-flex items-center gap-1.5"
+                    :style="stackCat === c.id ? catStyle(c.id) : ''"
+                    :class="stackCat === c.id ? '' : 'border-bd dark:border-bd-dark text-t2 dark:text-t2-dark hover:border-bd2'"
+                    @click="stackCat = (stackCat === c.id ? '' : c.id)">
+              <span class="mdi" :class="c.icon" :style="stackCat === c.id ? '' : 'color:' + c.color"></span>
+              <span x-text="c.name"></span>
+              <span class="opacity-60" x-text="c.count"></span>
+            </button>
+          </template>
+        </div>
         <div class="grid sm:grid-cols-2 lg:grid-cols-3 gap-4" x-show="filteredStacks.length > 0">
           <template x-for="s in filteredStacks" :key="s.name">
-            <div class="card card-hover flex flex-col">
+            <div class="card card-hover flex flex-col border-l-4"
+                 :style="'border-left-color:' + cat((s.categories || [])[0] || 'overig').color">
               <div class="px-4 py-3.5 flex items-center gap-2.5 border-b border-bd dark:border-bd-dark">
                 <template x-if="s.logo_url"><img :src="s.logo_url" class="w-8 h-8 rounded-lg object-contain bg-s2 dark:bg-s2-dark p-0.5 shrink-0" loading="lazy" onerror="this.style.display='none'"></template>
                 <template x-if="!s.logo_url"><span class="w-8 h-8 rounded-lg bg-s2 dark:bg-s2-dark grid place-items-center text-base shrink-0" x-text="s.icon || '📦'"></span></template>
@@ -273,6 +291,17 @@ tailwind.config = {
                 <span class="badge" :class="s.running ? 'badge-ok' : !s.has_compose ? 'badge-warn' : 'badge-dim'" x-text="!s.has_compose ? '—' : s.running ? t('running') : t('stopped')"></span>
               </div>
               <div class="p-4 flex flex-col gap-3 flex-1">
+                <div class="flex flex-wrap gap-1" x-show="(s.categories || []).length">
+                  <template x-for="c in (s.categories || [])" :key="c">
+                    <button type="button" @click="stackCat = c"
+                            class="text-[10px] font-semibold px-2 py-0.5 rounded-md border inline-flex items-center gap-1"
+                            :style="catStyle(c)" :title="t('filter_on_category')">
+                      <span class="mdi text-[11px]" :class="cat(c).icon"></span>
+                      <span x-text="cat(c).name"></span>
+                    </button>
+                  </template>
+                </div>
+
                 <!-- Containerchips; klik klapt het beheerpaneel per container uit -->
                 <div class="flex flex-wrap gap-1.5 items-center cursor-pointer"
                      x-show="s.containers && s.containers.length"
@@ -386,6 +415,23 @@ tailwind.config = {
           <button @click="syncAllRepos()" class="btn"><span class="mdi mdi-source-pull"></span> <span x-text="t('pull')">Pull</span></button>
           <button @click="modal='add-repo'" class="btn btn-primary"><span class="mdi mdi-plus"></span> <span x-text="t('add_repo')">Repository</span></button>
         </div>
+        <!-- Categorieën met hun eigen kleur; klikken filtert de lijst. -->
+        <div class="flex flex-wrap gap-1.5 mb-3" x-show="storeCategories.length">
+          <button class="text-[11px] font-semibold px-2.5 py-1 rounded-lg border transition"
+                  :class="!storeCat ? 'border-ac bg-ac/10 text-ac dark:text-ac-dark' : 'border-bd dark:border-bd-dark text-t2 dark:text-t2-dark hover:border-bd2'"
+                  @click="storeCat = ''" x-text="t('all')">Alle</button>
+          <template x-for="c in storeCategories" :key="c.id">
+            <button class="text-[11px] font-semibold px-2.5 py-1 rounded-lg border transition inline-flex items-center gap-1.5"
+                    :style="storeCat === c.id ? catStyle(c.id) : ''"
+                    :class="storeCat === c.id ? '' : 'border-bd dark:border-bd-dark text-t2 dark:text-t2-dark hover:border-bd2'"
+                    @click="storeCat = (storeCat === c.id ? '' : c.id)">
+              <span class="mdi" :class="c.icon" :style="storeCat === c.id ? '' : 'color:' + c.color"></span>
+              <span x-text="c.name"></span>
+              <span class="opacity-60" x-text="c.count"></span>
+            </button>
+          </template>
+        </div>
+
         <!-- Tags uit alle repo's samen; klikken filtert de lijst. -->
         <div class="flex flex-wrap gap-1.5 mb-5" x-show="storeTags.length">
           <button class="text-[11px] font-semibold px-2.5 py-1 rounded-lg border transition"
@@ -399,7 +445,7 @@ tailwind.config = {
         </div>
         <div class="space-y-7">
           <template x-for="repo in repos" :key="repo.id">
-            <div x-show="!storeQuery && !storeTag || filteredStore(repo.id).length">
+            <div x-show="!storeQuery && !storeTag && !storeCat || filteredStore(repo.id).length">
               <div class="flex items-center gap-2 mb-3">
                 <span class="mdi mdi-source-branch text-ac dark:text-ac-dark text-lg"></span>
                 <span class="font-bold text-wh dark:text-wh-dark text-sm" x-text="repo.name"></span>
@@ -423,8 +469,16 @@ tailwind.config = {
                       </div>
                       <span x-show="stack.format === 'boilerplate'" class="badge badge-info shrink-0" title="ChristianLempa Boilerplate">BP</span>
                     </div>
-                    <div class="flex flex-wrap gap-1 mb-3" x-show="stack.tags && stack.tags.length">
-                      <template x-for="tag in (stack.tags || []).slice(0,3)">
+                    <div class="flex flex-wrap gap-1 mb-3" x-show="(stack.categories || []).length || (stack.tags || []).length">
+                      <template x-for="c in (stack.categories || [])" :key="c">
+                        <button type="button" @click.stop="storeCat = c"
+                                class="text-[10px] font-semibold px-2 py-0.5 rounded-md border inline-flex items-center gap-1"
+                                :style="catStyle(c)" :title="t('filter_on_category')">
+                          <span class="mdi text-[11px]" :class="cat(c).icon"></span>
+                          <span x-text="cat(c).name"></span>
+                        </button>
+                      </template>
+                      <template x-for="tag in (stack.tags || []).slice(0,2)">
                         <span class="text-[10px] font-mono px-2 py-0.5 rounded-md bg-s2 dark:bg-s2-dark text-t2 dark:text-t2-dark" x-text="tag"></span>
                       </template>
                     </div>
@@ -1551,8 +1605,9 @@ function app() {
 
     docker: { running: 0, containers: 0, images: 0 },
     stacks: [],
-    stackQuery: '',
-    storeQuery: '', storeTag: '',
+    stackQuery: '', stackCat: '',
+    storeQuery: '', storeTag: '', storeCat: '',
+    categories: [], catMap: {},
     images: [],
     audit: [],
     repos: [],
@@ -1604,6 +1659,7 @@ function app() {
       });
       await this.loadLangs();
       await this.loadLang(localStorage.getItem('lang') || 'nl');
+      await this.loadCategories();
       await this.loadAuth();
       if (!this.auth.authenticated) return;   // login-/setupscherm neemt het over
       await this.startApp();
@@ -1862,11 +1918,37 @@ function app() {
     async loadDashboard() { await this.loadDocker(); await this.loadStacks(); },
 
     async loadStacks() { const d = await this.rpc('/api/stacks'); this.stacks = Array.isArray(d) ? d : (d.stacks || []); },
+    async loadCategories() {
+      const d = await this.rpc('/api/categories?lang=' + (localStorage.getItem('lang') || 'nl'));
+      this.categories = d.categories || [];
+      this.catMap = Object.fromEntries(this.categories.map(c => [c.id, c]));
+    },
+    cat(id) { return this.catMap[id] || { id, name: id, color: '#94a3b8', icon: 'mdi-shape-outline' }; },
+    // Doorzichtige achtergrond in dezelfde kleurtoon, zodat het in licht en
+    // donker leesbaar blijft zonder twee paletten bij te houden.
+    catStyle(id) {
+      const c = this.cat(id).color;
+      return `color:${c};background:${c}1a;border-color:${c}40`;
+    },
+    // Welke categorieën komen voor in de app store, met hun aantal.
+    get storeCategories() {
+      const telling = {};
+      for (const lijst of Object.values(this.storeStacks || {})) {
+        for (const st of lijst) for (const c of (st.categories || [])) {
+          telling[c] = (telling[c] || 0) + 1;
+        }
+      }
+      return this.categories
+        .filter(c => telling[c.id])
+        .map(c => ({ ...c, count: telling[c.id] }));
+    },
+
     // Apps filteren op naam, omschrijving en tags; tagfilter werkt aanvullend.
     filteredStore(repoId) {
       const lijst = this.storeStacks[repoId] || [];
       const q = this.storeQuery.trim().toLowerCase();
       return lijst.filter(s => {
+        if (this.storeCat && !(s.categories || []).includes(this.storeCat)) return false;
         if (this.storeTag && !(s.tags || []).includes(this.storeTag)) return false;
         if (!q) return true;
         return (s.name || '').toLowerCase().includes(q)
@@ -1889,7 +1971,21 @@ function app() {
         .slice(0, 14);
     },
 
-    get filteredStacks() { const q = this.stackQuery.toLowerCase(); return q ? this.stacks.filter(s => (s.name||'').toLowerCase().includes(q)) : this.stacks; },
+    get filteredStacks() {
+      const q = this.stackQuery.toLowerCase();
+      return this.stacks.filter(s => {
+        if (this.stackCat && !(s.categories || []).includes(this.stackCat)) return false;
+        return !q || (s.name || '').toLowerCase().includes(q);
+      });
+    },
+    // Categorieën van de geïnstalleerde stacks, met hun aantal.
+    get stackCategories() {
+      const telling = {};
+      for (const s of this.stacks) for (const c of (s.categories || [])) {
+        telling[c] = (telling[c] || 0) + 1;
+      }
+      return this.categories.filter(c => telling[c.id]).map(c => ({ ...c, count: telling[c.id] }));
+    },
     async stackAction(name, action) {
       const d = await this.rpc(`/api/stacks/${encodeURIComponent(name)}/${action}`, {});
       if (d.job_id) this.pollJob(d.job_id, () => this.loadStacks());
diff --git a/server-up/translations/en.json b/server-up/translations/en.json
index a8e689a..5561eae 100644
--- a/server-up/translations/en.json
+++ b/server-up/translations/en.json
@@ -253,5 +253,7 @@
   "enter_manually": "Enter manually…",
   "no_connectable_app": "No {app} is installed yet. Install it first, or enter the address manually.",
   "connect_apps": "Connect to other apps",
-  "connect_apps_hint": "Put this stack on the shared network '{net}' so it can reach other apps by name and vice versa. Without this, every stack stands alone."
+  "connect_apps_hint": "Put this stack on the shared network '{net}' so it can reach other apps by name and vice versa. Without this, every stack stands alone.",
+  "filter_on_category": "Filter by this category",
+  "categories": "Categories"
 }
diff --git a/server-up/translations/nl.json b/server-up/translations/nl.json
index 79f0aab..f539f92 100644
--- a/server-up/translations/nl.json
+++ b/server-up/translations/nl.json
@@ -253,5 +253,7 @@
   "enter_manually": "Handmatig invullen…",
   "no_connectable_app": "Er is nog geen {app} geïnstalleerd. Installeer die eerst, of vul het adres handmatig in.",
   "connect_apps": "Verbinden met andere apps",
-  "connect_apps_hint": "Zet deze stack op het gedeelde netwerk '{net}', zodat hij andere apps op hun naam kan bereiken en andersom. Zonder dit staat elke stack op zichzelf."
+  "connect_apps_hint": "Zet deze stack op het gedeelde netwerk '{net}', zodat hij andere apps op hun naam kan bereiken en andersom. Zonder dit staat elke stack op zichzelf.",
+  "filter_on_category": "Filter op deze categorie",
+  "categories": "Categorieën"
 }
diff --git a/tests/test_categories.py b/tests/test_categories.py
new file mode 100644
index 0000000..b1a7f2e
--- /dev/null
+++ b/tests/test_categories.py
@@ -0,0 +1,113 @@
+"""Categorieën: indeling, kleuren en hoe ze door de API komen."""
+import json
+import sys
+from pathlib import Path
+
+import pytest
+
+WORTEL = Path(__file__).resolve().parent.parent
+sys.path.insert(0, str(WORTEL / "server-up"))
+
+from core import boilerplates as bp
+from core import categories as cat
+
+from conftest import login
+
+APPS = sorted(d for d in (WORTEL / "apps").iterdir() if d.is_dir())
+
+
+def test_elke_categorie_heeft_naam_en_kleur():
+    for cid, c in cat.CATEGORIES.items():
+        assert c["nl"] and c["en"], cid
+        assert c["color"].startswith("#") and len(c["color"]) == 7, cid
+        assert c["icon"].startswith("mdi-"), cid
+
+
+def test_kleuren_zijn_uniek():
+    """Twee categorieën met dezelfde kleur zijn niet uit elkaar te houden."""
+    kleuren = [c["color"] for c in cat.CATEGORIES.values()]
+    assert len(kleuren) == len(set(kleuren))
+
+
+@pytest.mark.parametrize("app", APPS, ids=[d.name for d in APPS])
+def test_elke_app_heeft_geldige_categorieen(app):
+    cats = bp.metadata(app)["categories"]
+    assert cats, "geen categorie"
+    for c in cats:
+        assert c in cat.CATEGORIES, f"onbekende categorie '{c}'"
+    assert len(cats) == len(set(cats)), "dubbele categorie"
+
+
+def test_apps_mogen_in_meerdere_categorieen():
+    meervoudig = [d.name for d in APPS if len(bp.metadata(d)["categories"]) > 1]
+    assert len(meervoudig) >= 20, "vrijwel niemand valt onder meerdere categorieën"
+
+
+def test_elke_categorie_wordt_gebruikt():
+    """Een categorie die nergens voorkomt, is alleen maar ruis in het filter."""
+    gebruikt = {c for d in APPS for c in bp.metadata(d)["categories"]}
+    ongebruikt = set(cat.CATEGORIES) - gebruikt - {"overig"}
+    assert not ongebruikt, f"categorieën zonder apps: {sorted(ongebruikt)}"
+
+
+def test_afleiden_uit_tags_voor_externe_repos():
+    """Apps uit een externe repo geven geen categorieën op; dan leiden we ze af."""
+    assert "media" in cat.derive(["films", "series"])
+    assert "domotica" in cat.derive(["zigbee", "mqtt"])
+    assert "beveiliging" in cat.derive(["wachtwoorden"])
+    assert cat.derive([]) == ["overig"]
+    assert cat.derive(["iets-heel-onbekends"]) == ["overig"]
+
+
+def test_afleiden_geeft_hoogstens_drie():
+    veel = ["films", "zigbee", "wachtwoorden", "backup", "wiki", "taken", "ai"]
+    assert len(cat.derive(veel)) <= 3
+
+
+def test_normalize_gooit_onbekende_weg():
+    assert cat.normalize(["media", "bestaatniet", "media"]) == ["media"]
+
+
+def test_normalize_valt_terug_op_tags():
+    assert cat.normalize([], ["films"]) == ["media"]
+
+
+def test_endpoint_geeft_kleuren(client):
+    login(client)
+    d = client.get("/api/categories").get_json()
+    ids = {c["id"] for c in d["categories"]}
+    assert "media" in ids and "domotica" in ids
+    media = next(c for c in d["categories"] if c["id"] == "media")
+    assert media["color"].startswith("#") and media["name"]
+
+
+def test_endpoint_in_het_engels(client):
+    login(client)
+    d = client.get("/api/categories?lang=en").get_json()
+    media = next(c for c in d["categories"] if c["id"] == "media")
+    assert media["name"] == "Media"
+    fam = next(c for c in d["categories"] if c["id"] == "gezin")
+    assert fam["name"] == "Family & home"
+
+
+def test_stacklijst_geeft_categorieen(client, env):
+    login(client)
+    stack = env["lib"] / "jellyfin"
+    stack.mkdir(parents=True)
+    (stack / "docker-compose.yml").write_text("services:\n  a:\n    image: x\n")
+    (stack / ".serverup.json").write_text(json.dumps(
+        {"source": "jellyfin", "name": "Jellyfin", "categories": ["media"]}))
+    d = client.get("/api/stacks").get_json()
+    assert d[0]["categories"] == ["media"]
+
+
+def test_oude_installatie_zonder_categorieen(client, env):
+    """Een stack van vóór deze versie heeft geen categorieën opgeslagen; die
+    mogen niet leeg blijven, anders valt de kleurmarkering weg."""
+    login(client)
+    stack = env["lib"] / "oud"
+    stack.mkdir(parents=True)
+    (stack / "docker-compose.yml").write_text("services:\n  a:\n    image: x\n")
+    (stack / ".serverup.json").write_text(json.dumps({"source": "oud", "name": "Oud"}))
+    d = client.get("/api/stacks").get_json()
+    assert d[0]["categories"] == ["overig"]