This page explains what the “My progress” feature on the quizzes stores, and where.
If you do not sign in
Your quiz results are stored only in your browser’s localStorage.
Nothing is sent to any server. Clearing your browser data clears the record.
If you sign in with Google
So that your progress follows you across devices, it is stored in Firebase Authentication and Cloud Firestore, operated by Google LLC.
Stored in this site’s database
- The user ID issued by Firebase (a random string)
- Per-quiz results: best streak, rounds played, correct answers, questions asked, last played date
- Per-question correct and incorrect counts
- The number of answers given on each day you studied
- Badges earned and the dates they were earned
Your email address, name and profile photo are not written to this site’s database.
They are, however, held by Firebase Authentication
Google sign-in inherently requires an authentication provider, and Firebase Authentication records your email address and display name. This site does not link those to your results or use them for anything.
Purpose
The data is used solely to carry your progress between your own devices. It is never used for advertising or profiling, and is never shared or sold.
Retention and deletion
- Erase progress on this device — the button on the “My progress” page, or clearing this site’s data in your browser.
- Delete account and synced data — the button on the “My progress” page removes your stored progress and your authentication record. This cannot be undone.
Where the data is held
The data is stored in Firebase, provided by Google LLC, and processed in that company’s data centres. See Firebase privacy and security for details.
Contact
For questions or deletion requests, please open an issue on GitHub or send a DM on X (Twitter).