Thumb-Key icon

Thumb-Key

heretic
Keyboard & IME Internet
Version
5.1.16
Size
3.9 MB
Requires
Android API 24+
4.3 / 5 · 6,353 ratings 0 downloads

Updated Sep 22, 2026

Quick answer

A privacy-conscious keyboard made for your thumbs.

F-Droid repository metadata

Thumb-Key is a privacy-conscious smart keyboard, made specifically for your thumbs. It features a 3x3 grid layout, and uses swipes for the less common letters. Its easy to learn, and designed for fast typing speeds. Instead of relying on profit-driven, privacy-offending word and sentence prediction for accuracy, as do most popular phone keyboards like Gboard and Swiftkey, Thumb-Key uses large keys with predictable positions, to prevent your eyes from hunting and pecking for letters. As the key positions get ingrained into your muscle memory, eventually you'll be able to appromixate the fast speeds of touch-typing, your eyes never having to leave the text edit area. This project is a follow-up to the now unmaintained (and closed-source) MessagEase Keyboard, which is its main inspiration.

Screenshots

Thumb-Key screenshot 1

What’s new

How to install

  1. Download the APK from the button at the top of this page.
  2. Allow “Install unknown apps” for your browser or file manager only, not for every app.
  3. Open the downloaded file and confirm the installation.
  4. If installation fails with “App not installed,” remove an earlier build of the same app first. A signature conflict is the usual cause.

Data safety

  • Every file is checked against its published SHA-256 before it is listed.
  • Files are scanned for malware on every update.
  • The permissions each app requests are listed on its own page.
  • Read the full safety policy for how we test, flag, and delist files.

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