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Calculate

train mental calculation
New in version 3.1
- monochrome icon
- updated buildtools and dependencies
A simple mental calculation trainer with this features:

- contains the four elementary arithmetic operations and the prime factorization
- configurable task types and diffculty
- configurable number input field
- statistic about the performance
- multi user support
- time trial mode (solve as many tasks as possible within a defined time) with tasks depending on the wall clock time so that one can play "against" another one with the same tasks
  • app screenshot
  • app screenshot

Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

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  • Version 3.1 (22) suggested Added on Sep 25, 2025

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 6.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • com.rechnen.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 2.9 MiB PGP Signature | Build Log

  • Version 3.0 (21) - Added on May 11, 2025

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • com.rechnen.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 4 MiB PGP Signature | Build Log

  • Version 2.1 (20) - Added on May 22, 2022

    This version requires Android 4.0.3 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    No permissions

    Download APK 2.4 MiB PGP Signature | Build Log

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