Privacy
Working draft — last updated July 3, 2026.
What we store
Your email address and password hash (for signing in), and the content you create: decks, cards, your written explanations and review history, and — if you set them — a username and avatar. That's the product working, not surveillance.
Where it lives
Data is stored with Supabase (Postgres) in the EU (eu-west-1) and served via Vercel. Passwords are hashed by Supabase Auth; we never see them.
What's visible to others
Nothing, by default — decks are private. If you publish a deck to the hub, its prompts, references, and key points become visible to signed-in users under your username, along with your avatar, likes, and comments. Your explanations and review history are never shared. Your email is never shown to anyone.
AI features
If AI generation is enabled and you use it, the card content you submit is sent to Anthropic's API to produce the reference or feedback, subject to their data handling terms. Self-grading and reviewing never involve AI.
Tracking
No ads, no third-party trackers. Cookies are used only to keep you signed in.
Your data is yours
Export everything (including full review history) from settings at any time. Deleting your account permanently removes your data, including anything you shared on the hub.
Contact
Operated by FeynmanFSRS. Reach us at support@feynmanfsrs.com.