Watchlist Gap Checker

See which Douban Top 250 and festival titles are missing from your library

Problem

Cinephiles chasing Douban Top 250, IMDb Top 250, and major festival winners struggle to check what's already in their Emby library. The same film appears on several lists under different localized titles, so manual cross-checking is slow and has to be redone every time a list updates.

Solution

Maintain curated TMDB lists (Douban, IMDb, Oscars, Cannes, Berlin, Venice) and automatically match them against your Emby/Jellyfin library, outputting collected / missing / duplicate lists and letting you export the to-acquire set. Match by TMDB ID plus an alias table to resolve title conflicts.

Users

Home media enthusiasts running Emby or Jellyfin who collect classic and award-winning films

MVP

Import curated TMDB lists; connect to Emby/Jellyfin to read the library; match by TMDB ID plus title aliases; output a missing list with CSV export; weekly list refresh with new-gap alerts

Revenue

One-time purchase around $3–4, or a yearly $5 subscription with ongoing list curation; later, paid TMDB list feeds

Why now

Self-hosted Emby and Jellyfin libraries are growing steadily, list data is public, and a small focused desktop client is well within a solo developer's reach