What we keep
Your email address (to sign you in), your vault (courses, review history, calibration log, learner profile — the product itself), your subscription state (via Stripe; we never see card numbers), and per-request AI usage counts (so allowances work). Signing in as a guest keeps everything in your own browser instead.
What we do with it
Run the service. Your study material and answers are sent to Anthropic's Claude models to write lessons and grade answers — that's the product working, not advertising. We don't sell your data, we don't run third-party ad trackers, and we don't use your vault to train models.
Who touches it
Three processors, each doing one job: Supabase (accounts and vault storage), Stripe (payments), Anthropic (course writing and tutoring). Plus the hosting platform the app runs on. Each receives only what its job requires.
Your controls
Download everything from your account at any time as plain files. To delete your account and its data, email support@chiron.study— deletion completes within 30 days and we'll confirm when it's done. Questions about anything here: same address.