Last updated: 15 August 2026
MathMind is a mental-maths brain game for all ages, published by CryoSim. We designed MathMind to respect your privacy. In short: MathMind does not collect, store, or share any personal information. There are no accounts, no sign-in, no ads and no tracking. The one thing that leaves your device is an optional leaderboard score, described below, and you can switch it off.
No personal information. MathMind does not ask for your name, email, phone number, location, contacts, photos, or any other personal data, and it does not require you to create an account or sign in.
MathMind includes a weekly worldwide leaderboard. It is controlled by a single switch in Settings → Compete worldwide. While it is on, and only when you finish a scoring run, the app sends four things to our server at cryosim.com:
We do not store IP addresses, country, device information, or any identifier that could be linked back to a person. Turning the switch off stops all of this immediately; with it off, MathMind behaves exactly as a fully offline app.
In Settings → Privacy, "Start over as a new player" deletes every leaderboard row belonging to your player id from our server and gives you a fresh random id and nickname. No request or email is needed. You can also email us at the address below and we will delete it for you.
Everything else — your saved age, level progress, points, XP, badges, daily streak, quests and settings — stays on your device only, and is removed if you uninstall the app.
MathMind contains no advertisements, no third-party analytics, and no tracking of any kind. There are no third-party SDKs that collect data.
MathMind is suitable for students, including children, and complies with Google Play's Families policy requirements. The app collects no personal information from anyone, including children. The leaderboard was designed specifically with younger players in mind: there is no free-text entry anywhere in the app, no chat, no messaging, no profile photos and no way for one player to contact another. Nicknames come from a fixed word list chosen by us, so no child can be identified by their leaderboard entry and no inappropriate text can appear on it. A parent or guardian can turn the leaderboard off entirely in Settings.
MathMind requests no sensitive device permissions. It does not use the camera, microphone, location, contacts, or your personal files. It requests internet access, used solely for the optional leaderboard described above, for Google Play's in-app update check, and (if you allow it) for the optional daily practice reminder notification.
If this policy changes, the updated version will be posted on this page with a revised "Last updated" date.
Questions about this policy? Email cryosim2026@gmail.com.