What we collect
- If you sign in: your email address and, for Google sign-in, your name and profile photo — used only to identify your account. Handled by Firebase Authentication.
- Your progress (solved problems, saved code, submission history), stored in your browser and — if you're signed in — synced to Firestore so it follows you across devices.
- Anonymous usage analytics (pages viewed, approximate location, device type) via Google Analytics. We honor your browser's Do Not Track setting.
What we don't do
- We don't sell your data or show ads.
- Code you write in the editor runs entirely in your browser; it's only sent to our database if you're signed in, so it can sync to your other devices.
Your choices
You can clear progress from the Problems page, and you can ask us to delete your account and data at any time by emailing the site owner at the address in the site footer or repository.