Saber
Saber is a free, open-source notes app for Android and iOS. The notes app built for handwriting. It has 4,976 GitHub stars and is released under the GPL-3.0-only license, and you can install it from F-Droid, Google Play and the App Store.
github.com/saber-notes/saber (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 Saber
Saber is the notes app built for handwriting. It's designed to be as simple and intuitive as possible, while still delivering unique features that you'll actually use. Additionally, Saber is available across all your devices, large and small, and syncs between them seamlessly. Notably, it can invert your notes when you're in dark mode. This allows you to write with white ink on a black background, which is much easier on the eyes in low-light environments like when the teacher turns off the lights in class. Images and PDFs are also inverted, so you can still use a digital printout or a textbook without the fuss.
Privacy and F-Droid
F-Droid builds Saber 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 Saber free and open source?
Yes. Saber's source code is public on GitHub under the GPL-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 Saber?
You can install Saber from F-Droid (package com.adilhanney.saber), from Google Play and from the App Store; the links are on this page. Its GitHub repository also publishes releases (latest: v1.37.0).
Is Saber still maintained?
The repository's most recent commit was on Oct 27, 2026. Its F-Droid listing was last updated on Oct 22, 2026. appsgit only lists apps whose repository had a commit in the last six months.