QBrain is an educational game for ages 13 and over, and it is played by adults as well as teenagers. Its difficulty levels — Starter, Explorer, Challenger and Master — describe how hard the questions are, not how old the player is.
It is not directed to children under 13, and this matches our Google Play target-audience declaration. We know a younger child may still play it alongside a parent, so we have built it to be safe in that case anyway: there is no account, no sign-in, no chat, no user-generated content and no way for one user to contact another. Nothing a player types ever leaves the device.
The following is saved in the app's private storage on the device so progress is not lost between sessions. None of it is transmitted.
| Stored on the device | Why |
|---|---|
| Explorer name and avatar chosen in the app | So a player sees their own progress |
| XP, level, daily streak, streak freezes | Progression |
| Badges, landmarks, daily quests | Progression |
| Practice counts and accuracy per skill | To adapt question difficulty |
| Questions answered incorrectly | To offer a review round |
| High scores | To show a personal best |
| Settings (sound, haptics, accessibility) | To honour your preferences |
The explorer name is whatever you type — we suggest a first name or a nickname. It never leaves the device and is visible only on that device. Uninstalling the app deletes all of it.
A parent can copy every explorer’s progress out of the app as plain text, to keep as a backup or to move to another device. It is behind the same parent check as the settings above.
If QBrain stops working, an anonymous technical report is sent to Firebase Crashlytics so we can fix it. A crash report contains the error, the screen that was open, and the app version. It contains no name, no answers, no typed text, and nothing about what the player was learning.
Crash reporting is on by default, and you can turn it off at any time in Settings › Privacy & data › Send crash reports.
Why this differs from analytics below: a crash report describes a fault in our software, not how anyone plays. Collecting crash reports only from those who opted in would leave crashes unfixed for everyone else — including the families who did opt in.
QBrain can send anonymous counts of events to Firebase Analytics — for example “a maths round was completed” or “a badge was earned”. These are event names with a number attached. The app is built so that it is structurally incapable of sending anything else: there is no code path through which a name, a typed answer or any free text could be transmitted.
Change this at any time in Settings › Privacy & data.
QBrain currently contains no advertising. If advertising is introduced in a future version, this policy will be updated before that version is released, the Google Play Data Safety declaration will be updated, and any advertising will be age-appropriate for a 13+ audience with ad personalisation disabled.
QBrain currently contains no in-app purchases or subscriptions. If they are introduced, purchases will be processed by Google Play — we would never receive or store payment card details — and this policy will be updated first.
| Permission | Why |
|---|---|
VIBRATE | Gentle haptic feedback on answers. Can be turned off in Settings. |
INTERNET | Crash reports and, if enabled, anonymous analytics. Never required to play. |
ACCESS_NETWORK_STATE | To avoid attempting a transfer while offline. |
QBrain requests no location, camera, microphone, contacts or storage permissions. Every game, all content and all progress work with no internet connection.
Firebase (Google) processes crash reports and, where enabled, anonymous analytics. Firebase generates an app-instance identifier so repeat sessions can be counted; it is not linked to any name or account. Advertising-identifier collection and ad personalisation are switched off in the app's configuration. Turning analytics off calls Firebase's own data reset, which discards that identifier.
There is no server-side copy of anyone's progress, so nothing survives uninstallation. See our data deletion page for details.
QBrain is intended for ages 13 and over and is not directed to children under 13. Regardless of age, we do not knowingly collect personal information from any user. There is no account, no user-generated content, no chat, no social feature and no way for one user to contact another inside the app.
If you have any child-safety concern, or believe a child has provided personal information, contact us at support@zinijo.com and we will act promptly.
Depending on where you live you may have rights to access, correct or delete information held about you. Because QBrain stores progress only on your own device and collects no personal information, you can exercise these directly using the deletion options above. For anything else, contact us.
If this policy changes, the version and effective date at the top will change and the updated policy will be published here before the corresponding app update is released.
Email: support@zinijo.com
This address is monitored and is also our designated child-safety contact.