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rechnen-android
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Rechnen-Android

(Rechnen = german for calculating)

This is a simple, but configurable mental calculation trainer.

Download: https://f-droid.org/en/packages/com.rechnen.app/

Screenshots

Screenshot of training itself

Screenshot of a part of the configuration screen

History

old config screen old training screen

  • originally a dark themed App from the age of Android 4
  • for this version, nearly everything of it was rewritten
    • new UI (most changes were made at the config screen)
    • Kotlin instead of Java
    • training logic separated from the UI
    • Room as database abstraction instead of using sqlite directly
    • object serialization using JSON instead of a custom format

License

GPL-3.0-only