Mark as watched.
REALLY.
Every other extension fakes this feature locally. With ours, the full progress is saved to your actual YouTube account, as if you just watched the video.
Version 0.1.0 · Unpacked extension
Chrome Web Store release pending
12:48
Marked as watched.
Really?
Because they fake it, when you change device or use the mobile app, the videos are still there.
Saved to YouTube.
Really.
You can find the marked videos in your history, and the algorithm treats it correctly as watched.
Open the menu.
Use the three dots on a video thumbnail.
Mark as watched.
Completed progress goes to your YouTube account.
Get confirmation.
Success only after YouTube returns 100% progress.
Your history stays between your browser and YouTube.
No extension account, analytics, or developer server collecting your history. Success means verified history and full progress; YouTube decides how that affects recommendations.