Privacy
Sign-in is optional. If you never sign in, this site stores nothing about you on a server.
What the site stores
Signed out: the lessons you mark as read, the problems you tick and your code language. They stay in this browser and never leave your device.
Signed in with Google:
- Your name, email address and profile picture, from your Google account.
- The lessons you mark as read and the problems you tick, so they show on every device.
- Cookies that keep you signed in. They end when you sign out, or 7 days after your last visit.
What it does not do
- No ads, no tracking and no analytics cookies.
- It does not sell or share your data with anyone.
- It asks Google only for your name, email and picture. It cannot read your mail, contacts or files.
Where the data lives
The site runs on Vercel. Account data is in a Postgres database at Neon, connected through Vercel.
Delete your data
Last updated .