TMSync

About

TMSync passively tracks what you watch and records it to the right account
automatically — no manual logging, no checking in.

• Movies and non-anime TV → your Trakt account (real-time scrobble: start,
  pause, and a watched mark when you finish).
• Anime series → your AniList account (progress updates on dedicated anime
  sites).

How it works
TMSync detects the title, season, and episode from the page and the video
player, then records progress to the matching tracker. Sites are described
by lightweight "recipes" (data, not code). Don't see your site? Use the
built-in element picker to add it in a few clicks.

Privacy by design
There is no backend. Your viewing activity and login tokens stay in your
browser and are sent only to the tracker account you connect — never to the
developer or anyone else. TMSync requests access to a streaming site only
when you explicitly enable it, never to all sites at install.

Open source: https://github.com/kasusoba/TMSync