Last updated: May 18, 2026
DarkSquare Studio ("we", "us", or "our") operates the mobile application Chess: Play, Analyze, Improve (the "App") on iOS and Android platforms. This Privacy Policy explains what data the App collects, how it is used, and with whom it is shared.
1. Data We Collect
The App collects the following types of data:
Device or other IDs: The App uses an anonymous app instance identifier (Firebase Installation ID) and an advertising identifier (IDFA on iOS, Advertising ID on Android) for analytics and advertising purposes.
App activity: The App collects information about how you use the App, including screens viewed, games uploaded, games analyzed, and premium-related interactions.
Lichess account: If you choose to sign in via Lichess OAuth, your Lichess username and access token are stored locally on your device. We do not collect or store email addresses.
Purchase information: In-app purchases are processed by Apple (App Store) or Google (Google Play). We do not have access to your payment details.
2. How Data Is Used
Analytics: To understand how users interact with the App and improve its functionality. We use Firebase Analytics for this purpose.
Advertising: To display ads through Yandex Advertising Network. Ads are shown to free-tier users only. Premium users and users who purchased "Remove Ads" do not see ads.
App functionality: Lichess account linking (optional) requires OAuth authentication with Lichess.org. Your Lichess token is stored securely on your device and used only to access your Lichess account data.
3. App Tracking Transparency (iOS only)
On iOS, before collecting your advertising identifier (IDFA), the App will request your permission via Apple's App Tracking Transparency (ATT) prompt. If you decline, no advertising ID will be collected and only non-personalized ads may be shown. You can change this permission at any time in Settings > Privacy & Security > Tracking.
4. Third-Party Services
The App uses the following third-party services:
Firebase Analytics (Google LLC): Collects device identifiers and app usage data for analytics. Google Privacy Policy
Firebase Authentication: Used for Lichess OAuth sign-in. Google Privacy Policy
Firebase Firestore: Stores subscription tier status for authenticated users. Google Privacy Policy
Yandex Mobile Ads SDK: May collect device identifiers (IDFA on iOS, Advertising ID on Android) and usage data to serve relevant ads. Yandex Advertising Network Privacy Policy
Apple In-App Purchases / Google Play Billing: Processes in-app purchases. Apple and Google handle all payment data. Apple Privacy Policy · Google Payments Privacy Policy
5. Data Sharing
We do not sell or rent your personal data to third parties. Data may be shared with:
Service providers: Firebase (Google) and Yandex receive data as described above to provide analytics, authentication, and advertising services.
Legal requirements: We may disclose data if required by law.
6. Data Storage and Security
All game analysis, chess puzzles, and user preferences are stored locally on your device. Chess game data is not transmitted to our servers. Lichess OAuth tokens are stored securely using iOS Keychain (iOS) or Android EncryptedSharedPreferences (Android).
7. Children's Privacy
Chess: Play, Analyze, Improve is intended for a general audience and is not directed at children under 13. We do not knowingly collect personal information from children.
8. Your Choices
Opt out of ads: Purchase "Remove Ads" or a Premium subscription to remove all advertising.
Opt out of ad tracking on iOS: Deny the ATT prompt or go to Settings > Privacy & Security > Tracking and disable tracking for the App.
Opt out of ad tracking on Android: Go to Settings > Google > Ads > Delete advertising ID.
Revoke Lichess access: Disconnect your Lichess account in the App settings or revoke access through your Lichess.org profile.
9. Changes to This Policy
We may update this Privacy Policy from time to time. Changes will be reflected in the "Last updated" date above.
10. Contact Us
If you have questions about this Privacy Policy, contact us at:
Email: ivsilan2005@gmail.com
Developer: DarkSquare Studio