Privacy Policy

Math For Kids aged 2 to 10 for Android · Last updated: November 3, 2026

This policy explains what information the Math For Kids aged 2 to 10 app for Android phones and tablets (the “App”) uses, why, who it is shared with, and what choices you have. The App for iPhone and iPad has its own privacy policy.

Who is responsible

The App is developed by Bernard Bijoch, an independent developer based in Poland (“I”, “me”). I am the controller of personal data processed in connection with the App. You can contact me at any time at bbijoch@gmail.com.

In short

• The App is made for children. It has no accounts, no chat and no way to share personal information.
• Your child’s results and progress are stored only on your device. I do not receive them.
• The free version shows a single banner ad from Google AdMob, marked as directed to children and limited to content suitable for all ages. There are no full-screen ads, and the App does not use your device’s advertising identifier.
• Crash reports and start-up session records from Firebase Crashlytics help me fix errors. They contain technical details, never your child’s answers.

Information stored on your device

The App saves your child’s answers, star ratings, daily results and the progress calendar, as well as settings such as the operations to practise, the difficulty level, the number of questions per day and whether ads have been removed. This information is stored only on your device and is not sent to me. Deleting the App removes it.

Backup. If backup is turned on for your Android device, Android’s Auto Backup includes this information in your device backup in your Google account and can restore it when you reinstall the App or move to a new device. The backup is handled by Google under Google’s Privacy Policy; I have no access to it. You can turn backup off in your device’s settings.

Advertising

The free version of the App shows one banner ad provided by Google AdMob, a service of Google, on the menu, calendar and settings screens; there is no ad on the screen where your child answers questions. Every ad request is marked as directed to children and as coming from a user under the age of consent, so Google does not show personalised (interest-based) ads or remarketing, and ads are limited in Google AdMob to content suitable for general audiences (rating G). If you buy the in-app purchase that removes ads, no further ads are requested.

To deliver ads, the Google Mobile Ads SDK may collect and process:

• your IP address, which can indicate your approximate location;
• device and operating-system information, such as model, Android version, language and screen size;
• information about the App and about the ads shown and tapped;
• an app set identifier, which is limited to apps from the same developer on your device and is used to limit how often an ad is shown and to detect fraud.

Google uses this data to show ads, limit how often the same ad is shown, measure ad performance, and detect fraud and abuse. Google acts as an independent controller of this data under its own Privacy Policy. You can read how Google uses information from apps that use its services at policies.google.com/technologies/partner-sites.

Advertising identifier. The App does not request the advertising-identifier permission, so on Android 12 and later Google Play services does not give your device’s advertising identifier to the App or to the Google Mobile Ads SDK. On every Android version, each ad request is marked as directed to children, so Google does not use your device’s advertising identifier to personalise ads, for remarketing or to track your child across apps.

Users in the EEA, the UK and Switzerland. The App does not show a consent message, because it is directed to children and no consent is asked from them. Google therefore shows only non-personalised or limited ads, which are not based on activity in other apps or on websites.

Crash reports

The App uses Firebase Crashlytics, a service of Google, to report crashes. A crash report contains technical details of the error, the device model, Android version, App version, the time of the crash and a random identifier of your App installation. So that crash-free statistics can be calculated, Crashlytics also sends a short session record when the App starts, with the same random installation identifier, device model, Android version, App version and time, but no information about what your child does in the App. It does not contain your child’s answers, results or settings, and it is not linked to a name or contact details. I use crash reports only to find and fix errors. Google processes them on my behalf under the Firebase data processing terms and keeps them for a limited time; see Firebase’s privacy information.

In-app purchases

The purchase that removes ads is processed by Google Play. I do not receive any payment details; the App only learns whether ads have been removed. The purchase is offered only in the settings screen, and Google Play shows its own confirmation with the price before any payment. If the purchase is refunded, ads come back.

Legal bases (GDPR)

• Storing results, progress and settings on your device, including them in your device backup, and processing the purchase are necessary to provide the App (Art. 6(1)(b) GDPR).
• The delivery and measurement of non-personalised ads is based on my legitimate interests in funding a free app and keeping ads safe and suitable for children, and crash reports on my legitimate interest in keeping the App working (Art. 6(1)(f) GDPR). You can object at any time by contacting me, remove ads with the in-app purchase, or delete the App.

How long data is kept

Data stored on your device stays there until you delete the App; data in your device backup stays in your Google account according to Android’s backup settings. Crash data is kept for a limited time described in Firebase’s privacy information. Data collected by Google for advertising is retained according to Google’s retention policy.

Sharing and international transfers

The App shares data only with Google, as the advertising, crash reporting, backup and payment provider described above. Google is bound by its own privacy policy and data protection terms, which provide protection at least equal to that described in this policy, and may process data outside the European Economic Area, including in the United States, relying on safeguards such as the EU–U.S. Data Privacy Framework and the European Commission’s Standard Contractual Clauses.

Your rights

If you are in the EEA, the UK or Switzerland, you have the right to access, rectify and erase your personal data, to restrict or object to its processing and to data portability. Because I do not keep your data on any server of my own, most of these rights can be exercised directly on your device, for example by changing the App’s settings or deleting the App. Crash reports are linked only to a random installation identifier, so I usually cannot find them from your request; deleting the App resets that identifier. For any request or question, write to bbijoch@gmail.com; I will reply within one month.

You also have the right to lodge a complaint with a data protection authority: in Poland, the President of the Personal Data Protection Office (UODO, ul. Stawki 2, 00-193 Warsaw), or the authority in the country where you live or work.

Children

The App is directed at children aged 2 to 10. I do not collect any personal information from children: the App has no accounts, no free-text input that is sent anywhere, no chat and no social features, and your child’s results never leave the device. It does not request location, contacts, camera, microphone or phone permissions, and it does not read device identifiers such as the advertising identifier, IMEI or serial number. The limited technical data described above is collected by Google’s ad and crash-reporting services only to show ads suitable for children and to keep the App working. Parents and guardians can contact me at bbijoch@gmail.com with any question about the App’s data practices.

Security

Data saved by the App is kept in its private storage, protected by Android’s app sandbox and your device’s security settings. Ad requests and crash reports are sent to Google over encrypted connections.

Changes to this policy

I may update this policy when the App changes. The current version is always available on this page, with the date of the last update at the top. If a change significantly affects how your data is used, I will also mention it in the release notes of the App.

Contact

Bernard Bijoch, Poland · bbijoch@gmail.com