Privacy

What we store

In your browser: your XP, streak and stars (local storage), a random guest id (cm_anon) that counts your free lessons, and your cookie choice (cm_consent).
With an account: sign-in is handled by Clerk. We save your lesson sessions, the answers you check, the judge's feedback, and your progress, so you can review them.
AI judging: when AI judging is switched on, your answer is sent to the AI provider to be judged. Do not put personal information in answers.

Analytics cookies

We use Google Analytics to count visits and see which lessons help. It sets _ga cookies. We send events like "lesson completed", never the text you write. Advertising features are off. You can opt out at any time:

Delete your data

Delete every session, answer and score saved to your account. To delete the account itself, use "Manage account" in the profile menu.