Thumb-Key
Thumb-Key is a free, open-source keyboard for Android. A privacy-conscious keyboard made for your thumbs. It has 1,562 GitHub stars and is released under the AGPL-3.0-only license, and you can install it from F-Droid and Google Play.
github.com/dessalines/thumb-key (opens in a new tab)
Data as of from the GitHub API and the F-Droid index; description from the project's repository or F-Droid listing. Report an error
About Thumb-Key
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.
Privacy and F-Droid
F-Droid builds Thumb-Key from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.
No anti-features flagged on the latest F-Droid build.
Screenshots
Screenshots from the app's F-Droid listing.
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Is Thumb-Key free and open source?
Yes. Thumb-Key's source code is public on GitHub under the AGPL-3.0-only license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.
How do I install Thumb-Key?
You can install Thumb-Key from F-Droid (package com.dessalines.thumbkey) and from Google Play; the links are on this page. Its GitHub repository also publishes releases (latest: 5.1.19).
Is Thumb-Key still maintained?
The repository's most recent commit was on Oct 26, 2026. Its F-Droid listing was last updated on Oct 8, 2026. appsgit only lists apps whose repository had a commit in the last six months.