Last updated: 19 August 2026
Chess Brain Trainer does not require an account, does not show ads, and does not collect personal data such as your name, e-mail address or contacts.
Everything the app records about your practice - puzzles played, results, XP, ranks, achievements and settings - is stored only on your device. It never leaves it, and it is deleted when you uninstall the app.
The app uses Firebase Crashlytics (Google) to report crashes and errors. A report contains the device model, the Android and app version, and the technical details of the crash. It does not identify you personally and is used only to find and fix faults. Reports are sent over an encrypted connection and are deleted automatically after 90 days.
The optional Premium purchase is processed by Google Play. Google is the seller; we never receive or store your payment details.
The app is suitable for all ages and contains no ads and no links to external content.
Email: vladanpejovic1@gmail.com
Thank you for using Chess Brain Trainer!