Deluge vs qBittorrent: Which Torrent Client?

Want a self-hosted torrent client that runs headless and integrates with Sonarr and Radarr — but not sure whether Deluge or qBittorrent fits your setup better? Both are free, open-source BitTorrent clients with web UIs, Docker support, and full *arr stack compatibility. The differences come down to architecture, UI polish, and how much you want to customize. Feature Comparison Feature Deluge qBittorrent License GPL-3.0 GPL-2.0 Docker image lscr.io/linuxserver/deluge:2.2.0 lscr.io/linuxserver/qbittorrent:5.1.4 Backend engine libtorrent-rasterbar libtorrent-rasterbar Web UI Built-in (basic) Built-in (polished) Desktop client GTK client (separate) Integrated Plugin system Yes — Python plugins Limited (search plugins) RSS support Via plugin Built-in Sequential download Via plugin Built-in Categories/tags Labels only Categories + tags API JSON-RPC REST API (WebUI) Sonarr/Radarr support Full Full Default web port 8112 8080 RAM usage (idle) ~80-120 MB ~80-150 MB Architecture Deluge separates