Watch Later Tidy keeps your playlist cache, saved views and delete history on your own device. They are never uploaded to us and we hold no copy of them.

Three things leave your browser:
1. A request for a public configuration file on tidywl.com, with no identifiers and no payload, so the add-on survives YouTube changing its page layout.
2. A random install identifier, not linked to you or your Google account, and lifetime counts: videos deleted, likes removed, videos moved, bulk operations run, Lineups built, days you opened the dashboard, the size of your Watch Later, and your browser. Never a title, video ID, channel or timestamp. On Firefox this is sent only if you allow technical and interaction data. Records not updated for 12 months are deleted.
3. Only if you buy Pro: your licence key, or the Transaction ID from your receipt, and the device name you type when activating, so the key can be validated and you can see which devices use it.

Payment is handled by Paddle as merchant of record, in their own checkout on tidywl.com. The add-on never sees card details. The Lineup reads your YouTube watch history and subscriptions on your device only. Sending videos to Gemini Notebook, which you trigger yourself, is the one flow that sends video links elsewhere.

Full policy: https://tidywl.com/privacy/