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SlashFacts

Multiplication tables 2–9: see, remember, slash the answer.
New in version 1.1.0
Tablets: the paper column fills the screen in portrait, landscape and split screen.
About shows our contact address, hello@proto.fish.
A smaller download.
SlashFacts is a multiplication-tables trainer (2 to 9) built around a single gesture: you answer by drawing one continuous stroke through the digits of the result. No buttons, no rewards, no screens between attempts — see → remember → slash → next.

  • Pick the tables to practise, and each round adapts to the facts you keep missing or answer slowly.

  • A missed fact shows its answer and comes straight back until it is answered right.

  • The Facts map ticks every fact answered right first time — one mark a child can read at a glance.

  • Haptic feedback on every answer, fully usable offline.


Designed for children: no account, no network access, no analytics, no ads. Everything stays on the device.
Made by PROTO/fish · https://proto.fish
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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 1.1.0 (10100003) suggested Added on Oct 22, 2026

    x86_64

    This version requires Android 7.0 or newer.

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

    Permissions
    • control vibration
      Allows the app to control the vibrator.
    • fish.proto.slashfacts.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 28 MiB PGP Signature | Build Log

  • Version 1.1.0 (10100002) - Added on Oct 22, 2026

    arm64-v8a

    This version requires Android 7.0 or newer.

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

    Permissions
    • control vibration
      Allows the app to control the vibrator.
    • fish.proto.slashfacts.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 27 MiB PGP Signature | Build Log

  • Version 1.1.0 (10100001) - Added on Oct 22, 2026

    armeabi-v7a

    This version requires Android 7.0 or newer.

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

    Permissions
    • control vibration
      Allows the app to control the vibrator.
    • fish.proto.slashfacts.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 21 MiB PGP Signature | Build Log

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