Mathe-Trainer is an open-source (GPL-3.0-or-later) Android app by Christoph Bayer. The APK we host is 21 MB, it needs Android 7.0 or newer, and it declares 1 permission.
The file on this page is Mathe-Trainer 2.15.1, 20.79 MB, and it installs on Android 7.0 and newer.
We compared the signing certificate of this build with the certificate recorded the first time com.chrbayer.mathe_trainer entered the site, and published both the file's SHA-256 and the certificate's fingerprint above so you can check the download yourself. That comparison says the file was not repackaged by someone else; it is not a review of what the app does.
The manifest inside the APK declares 1 permission, none of which cover contacts, location, SMS, the camera or the microphone.
Its licence is GPL-3.0-or-later. We took this build from F-Droid, and the source for this exact version is linked below.
We do not show a star rating or an install count for this page: we have no measured figure for either, and a number we cannot source is worth less than an empty field.
- Version
- 2.15.1
- Size
- 20.79 MB
- Requires Android
- API 24
- Package
- com.chrbayer.mathe_trainer
- Signature checked on
- Oct 10, 2026
- Where this file came from
- F-Droid
- Licence
- GPL-3.0-or-later
- Source code
- Source for this version
File SHA-256: e29d63800afcbd5ee2a7310628ac4e91b3c634cda4b06f2715508ddbff70537c
Signing certificate (SHA-256): 7e85b3258cfd28059278887f771d0be0feb7b81c8143903129f8529937a611a1
We check that this file carries the same signing certificate as earlier releases of the same package. That shows the APK was not repackaged by someone else — it is not a security review of the app.
Declared permissions
- com.chrbayer.mathe_trainer.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Screenshots
