Privacy Policy

1. Information we collect

• The email address and the provider's user ID received when you sign in with Apple or Google (used only to identify you)
• Your nickname (shown in the ranking)
• Play mode results (bet, net result, whether each decision was correct, date) and paid-version purchase status

Learn and Review results and the review list are stored only on your device and are never sent to the server.

2. How we use it

For sign-in, compiling and showing the ranking, confirming the paid version, preventing abuse and answering inquiries.

3. Storage and security

Email addresses are stored encrypted and looked up by hash. The server is located in Japan and communicates over https only.

4. Sharing with third parties

We do not share your information with third parties except as required by law. Payments are handled by the App Store (Apple), Google Play and Stripe; the operator does not hold card details. RevenueCat is used to manage in-app purchases.

5. Deleting your account

You can delete your account from the App's settings. Deletion removes your email address, nickname and ranking records from the server and cannot be undone. The Sign in with Apple link is revoked as well.

6. Changes

This policy may be changed as needed. Changes take effect when posted on this page.