Effective July 28, 2026 · Applies to the CoStudy iOS app and costudy.net
When you create an account we collect your email address and a password (stored as a secure hash). When you make a purchase we receive purchase records (product purchased, date, and a transaction identifier) from Apple or our payment processor Stripe — we never see or store your card number. To enforce our one-phone-plus-one-computer account limit we store a random device identifier for your signed-in devices. Your study progress (cards seen, scores, lists) is stored with your account so it syncs between your iPhone and the web.
We don't sell your data, show ads, use third-party advertising or analytics trackers, or use your data for advertising of any kind. We don't collect your location, contacts, photos, or anything else from your device.
Your account and study data are stored with Supabase. Payments are processed by Apple (in-app purchases), Stripe (web purchases), and RevenueCat (purchase management). Each processes only what's needed to complete and maintain your purchase.
You can sign out at any time. To delete your account and all associated data, email us at 1992nburton@gmail.com from your account email and we'll complete the deletion within 30 days. Subscription management and refunds for in-app purchases are handled through your Apple ID settings.
CoStudy's study content spans school grades, but accounts and purchases are intended for adults or for students with a parent or guardian managing the account. We don't knowingly collect personal information from children under 13 without parental consent.
If this policy changes we'll update this page and its effective date. Questions: 1992nburton@gmail.com.