Synthseek

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Self-hosted, multi-user music library automation.

Synthseek searches across music providers, downloads through your slskd instance, matches metadata, and organizes your personal library with Beets. It is multi-user, provider-agnostic, and ships a built-in MCP server so assistants can drive your library.

Features

Modern, responsive web UI (mobile and desktop friendly)
Multi-user: local accounts and Plex OAuth, with member management and per-user libraries
Provider-agnostic catalog (Deezer by default, no API keys required)
Search for tracks, albums, artists, and playlists
A full music library to browse and manage everything you have downloaded, organized by albums, artists, playlists, and tracks
Playlist management: create, rename, and delete your own playlists, and add or remove tracks
Sync playlists to Plex, one at a time or all at once
slskd integration for P2P downloads, with an automatic or optional yt-dlp fallback
Download queue controls, with priority, pause, and resume
Per-request download-source and quality selection
Spotify library import, and playlist import and export (JSPF, XSPF, CSV)
Discovery integrations with Last.fm and ListenBrainz, with discovery mixes on a dedicated Discover page
Lidarr delegation with tag and monitor-scope selection
Metadata matching
Automatic file organization
End-to-end playlist downloads with automatic Plex reconstruction
Built-in MCP server, so assistants can search and manage your library (see the full list and examples of MCP tools)
Localization in English, Espanol, Deutsch, and Francais
Real-time progress tracking, logs viewer, and in-app update notifications