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 shows adverts, supplied by Google AdMob. They appear only between rounds — never during a question, never on the settings, backup or diagnostics screens, and never in the first two times the app is opened.
They are deliberately infrequent: at most three a day, at least four minutes apart, and only after several rounds have been played in a session. These limits are enforced by the app itself, not only by the advertising network.
Adverts use Android's advertising identifier, a resettable ID that belongs to the device rather than to a person. You can reset or delete it at any time in Android Settings › Privacy › Ads. Google may use it to limit how often an advert is repeated and to measure whether adverts work.
Advert content is restricted to a 13+ audience, matching the app's rating.
Your choice about personalised adverts. Where the law requires it — including the EEA and the UK — QBrain asks before any personalised advert is shown, using Google's User Messaging Platform. You can change that choice at any time in Settings › Privacy & data › Advert privacy options. Declining means you see non-personalised adverts, not more adverts.
QBrain Pro removes all advertising. Every game, level and feature is free and stays free — Pro removes the adverts and nothing else. There is also a free option that removes adverts for 24 hours in exchange for watching one.
Google's handling of advertising data is described in its own privacy policy.
QBrain Pro is available as a monthly or yearly subscription, or as a one-time lifetime purchase. Pro removes the adverts and nothing else — every game, level, badge and feature is free and stays free, for everyone.
All payments are handled by Google Play. We never receive, see or store payment card details, and we are not told your name or billing address. The app asks Google Play what you own so it knows whether to show adverts; that answer is a yes or a no, kept on the device.
Subscriptions are managed and cancelled in the Play Store under Subscriptions, not in QBrain. Cancelling keeps Pro until the paid period ends. A lifetime purchase can be restored on a new device with Settings › QBrain Pro › Restore purchase.
| 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. |
AD_ID | Android's resettable advertising identifier, used only for the adverts described above. Not used if you have Pro. |
BILLING | To offer QBrain Pro through Google Play. No payment details ever reach us. |
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. Turning analytics off calls Firebase's own data reset, which discards that identifier. Advert measurement is handled separately by AdMob and is described under Advertising above.
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.