Privacy Policy

Effective date: 25 May 2026

This Privacy Policy describes how Pawel Turczyk ("we", "us", "our") collects, uses, and shares information in connection with the Chess Revision mobile application (the "App").

1. Information we collect

The App is designed to collect as little data as possible.

Account and subscription data. If you purchase a subscription, Apple's App Store processes the transaction and shares with us only the receipt necessary to validate your entitlement. Subscription state is managed by RevenueCat, which assigns the App an anonymous identifier. We do not learn your real name, email address, or payment details from Apple.
Game content you provide. When you import a game via PGN paste, board photo, or by entering a Lichess or Chess.com username, that content is sent to our analysis backend for engine evaluation. The content is processed in memory and is not retained beyond the duration of the analysis request.
Diagnostic data. We collect anonymous performance and crash data (e.g. request timing, error codes) to keep the App running reliably. Diagnostic data does not contain any personally identifying information.
On-device storage. Your imported games, settings, and saved positions are stored locally on your device using the App's database. This data never leaves your device unless you explicitly share it.

2. How we use your information

To provide the core analysis and review features of the App.
To validate and manage your subscription entitlement.
To investigate bugs and improve performance.

We do not sell your personal information. We do not use your data for advertising. We do not track you across other apps or websites.

3. Third parties

Apple. Subscription purchases are processed by Apple under Apple's Privacy Policy.
RevenueCat. We use RevenueCat to manage subscription entitlements. RevenueCat receives an anonymous subscriber identifier and your Apple subscription receipt. See RevenueCat's Privacy Policy.
Amazon Web Services. Our analysis backend runs on AWS Lambda. Game positions you submit for analysis are processed by AWS in memory and are not persisted by us beyond the request.
Lichess and Chess.com. If you choose to import games by username, the App calls the public APIs of Lichess.org and Chess.com. Use of those services is governed by their own terms and privacy policies.

4. Data retention

We do not store game content on our servers. On-device data persists until you delete the App or clear it from within the App. Subscription receipts are retained for as long as required by Apple and applicable accounting law.

5. Your rights

Under the EU General Data Protection Regulation (GDPR), you have the right to access, correct, or delete personal data we hold about you, to object to processing, and to data portability. Because we do not hold personally identifying information beyond your anonymous subscription identifier, these rights are exercised in practice by cancelling your subscription and deleting the App. To make a formal request, email us at the address below.

6. Children's privacy

The App is rated for users aged 4 and over. We do not knowingly collect personal information from children under 13. If you believe a child has provided us with personal information, contact us and we will delete it.

7. International data transfers

The App's backend services are hosted in the European Union. If you use the App from outside the EU, your data may be transferred to and processed in the EU, which provides an adequate level of data protection under GDPR.

8. Security

All network traffic between the App and our backend is encrypted in transit using TLS. On-device data is stored within the App's protected container as managed by iOS.

9. Changes to this policy

We may update this policy from time to time. Material changes will be reflected in the Effective date above and announced in the App. Your continued use of the App after a change constitutes acceptance of the revised policy.

10. Contact

Pawel Turczyk
[email protected]