Your work stays yours.
There is no account or server database. Use versioned export files to move progress between browsers or create backups.
Export or import progress
Versioned JSON includes mastery, checkpoint attempts, bookmarks, notes, diagnostic answers, confidence, and preferences. Nothing is sent to a server.
Your browser is the database
There are no accounts, cookies, trackers, analytics, or server-side progress records. Clearing site storage removes progress unless you exported it.