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CrossWatch is a synchronization engine that keeps your Plex, Jellyfin, Emby, Simkl, Trakt and MDBlist in sync. It runs locally with a web UI to link accounts, configure sync pairs, run them manually or on schedule, and track stats/history.

Features

Core features Sync watchlists (one-/two-way) Live scrobble (Plex/Jellyfin/Emby → Trakt/SIMKL/MDBList) Sync ratings (one-/two-way) Sync watch history (one-/two-way) Keep snapshots with CW tracker Auto-remove from watchlist after finish

Tools & modes Analyzer: finds broken or missing matches/IDs Exporter: CSV files for popular services Editor: Edit and adjust your items Now Playing card, Stats, history, live logs Headless scheduled runs Trackers         Media servers     Others

Limitations

CrossWatch is lightweight: no database, JSON files only. That keeps it simple but caps scale.

• Not for very large libraries. JSON state and provider rate limits become the bottleneck.
• Soft size guidance (varies by hardware):
  • Watchlist: stable up to ~2,500 items total across providers.
  • History (plays): stable up to ~10,000 play events total.
  • Ratings: stable up to ~10,000 ratings total.
• Above these ranges you may see slower planning, large state files, and long first-run times.
• Heavy backfills (full history/ratings) can take hours. Prefer incremental windows when possible.
• Ratings can take a long time; i don’t cache ratings (by design).
• Only for Movies and Shows currently there is no Anime support.

Known Issues

• Some UI sections don’t auto-refresh reliably. When in doubt, Ctrl+F5 for a clean reload.
• Stale UI data after long runs: Ctrl+F5 again.
• Statistics may not always display the exact numbers yet.

Next steps

• Read the wiki: Getting Started
• File issues here: https://github.com/cenodude/CrossWatch/issues
• Back up before experiments. Don’t say I didn’t warn you. 😉