Tsundoku Watch
Privacy Policy
Last updated: July 12, 2026
Tsundoku Watch is a browser extension that keeps your AniList anime list in sync with what you watch on Crunchyroll. It is built to do that one job and to touch as little of your data as possible.
What the extension reads
When you watch on Crunchyroll, or when you click sync on your Crunchyroll history or watchlist, the extension reads only:
- the series title, season, and episode number of what you are watching or have watched;
- your Crunchyroll history and watchlist pages, but only at the moment you press the sync button.
It does not read your Crunchyroll account details, payment information, viewing beyond titles and episode numbers, or any other page you visit.
How that information is used
The series and episode information is sent to Tsundoku
(asktsundoku.com), which matches it to the correct AniList
entry and updates your watch progress on your own AniList
account. That is the only thing it is used for. Nothing is sold,
shared with advertisers, or transferred to any third party, and it is
never used for advertising, profiling, creditworthiness, or lending.
Authentication
To update your list on your behalf, the extension reads your own Tsundoku
session cookie for the asktsundoku.com origin and sends it
only to asktsundoku.com so your requests are authenticated as
you. Sign-in uses AniList's own OAuth flow through Tsundoku — the
extension never sees your AniList password, and no other site's cookies
are accessed.
What is stored, and where
The extension keeps a small amount of data in your browser's local extension storage:
- a cache mapping Crunchyroll series and seasons to their matched AniList entries;
- your list of series you've chosen to ignore;
- a recent-sync log shown in the popup;
- your settings, such as the auto-sync percentage threshold.
This data stays on your device. Removing the extension deletes it. The
only data that leaves your browser is the watch progress sent to
asktsundoku.com to update your AniList list.
What the extension does not do
- No analytics, tracking pixels, or advertising.
- No collection of browsing history or activity on other sites.
- No selling or sharing of your data with anyone.
- Nothing is injected into or altered on Crunchyroll beyond a small confirmation toast.
Changes to this policy
If this policy changes, the updated version will be posted on this page with a new "last updated" date.