Is my AniList login safe?

Zenbu has no backend and no database, so there's nowhere for your credentials to be stored server-side. Logging in uses AniList's own OAuth flow, and the resulting token is kept in your browser's local storage — it never touches a Zenbu server.

Logging out clears that token immediately. If you ever want to fully revoke access, you can do that from your AniList account settings too.