Qubit Chess: Privacy Policy
Qubit Chess keeps your chess on your device. This policy explains what little leaves it, and why.
1. Who we are
Qubit Chess is made by QubitSofTech ("we"). This policy covers the Qubit Chess Android app.
2. No account, no cloud copy
You don't create an account with us. Your profiles, games, ratings, puzzles, statistics, settings and credits are stored only on your device, in an encrypted database. Android cloud backup and device transfer are turned off for this data. We keep no copy, so we can't restore it if you uninstall the app or clear its data. You can export your games as PGN at any time.
3. Online play
When you play online, our relay server receives your display name, an online key created for your profile, your moves, and for rated games your rating and game result. The server needs these to pair players and run the game. Game data is kept in memory and deleted shortly after the game ends. For the global leaderboard, the server keeps each online profile's display name, ratings and number of rated games, linked to the online key and not to you personally. A profile that stops playing rated games is removed from the leaderboard after 90 days. We don't sell this data or use it for advertising.
4. Advertising
Qubit Chess is free and shows ads from Google AdMob: a banner below some lists, an occasional full-screen ad between games against the computer, and videos you choose to watch to earn credits. Ads never appear during an online game or on a board you are playing. To show and measure ads, Google collects device and ad data such as the advertising ID, IP address, approximate location and ad interactions, as described in Google's privacy policy (policies.google.com/privacy). Google never receives your games, ratings or profile from us.
5. Your ad choices
Where the law requires it (for example in the EEA, the UK and Switzerland) the app asks for your consent before showing personalised ads, and Settings has an "Ad privacy choices" option to change your choice. You can also reset or delete your advertising ID in your device's settings.
6. Credits
Credits are stored on your device. They have no cash value and are never shared with us or anyone else.
7. Fair play
To keep rated online games fair, the server checks game data for abuse, such as floods of illegal moves. A flagged player's games don't raise their rating. No personal data beyond the game data above is used.
8. Children
Qubit Chess isn't directed at children under 13, and we don't knowingly collect personal information from them.
9. Security
Local data is encrypted with keys kept in the Android Keystore, and you can protect a profile with a PIN. Online traffic to the relay is encrypted, and the app checks the server's identity.
10. Deleting your data
Settings → "Delete all local data" removes every profile, game and setting from this device, including the encryption keys. Leaderboard entries expire as described above. To ask us to remove a leaderboard entry sooner, contact us.
11. Changes
If this policy changes, the app will show the new version and its effective date.
12. Contact
Questions or requests: write to QubitSofTech, a software development company based in India, at support@qubitsoftech.com.