Butterfly
Butterfly is a free, open-source notes app for Android. Take notes, draw freely, and organize ideas across an endless workspace. It has 2,048 GitHub stars and is released under the AGPL-3.0-only license, and you can install it from F-Droid.
- Android
- Flutter
- Notes & to-do
- Actively maintained
About Butterfly
Butterfly is an open-source app for people who think better with space around their ideas. Instead of writing everything from top to bottom on a fixed page, you get an endless workspace where you can place notes, sketches, diagrams, images, and documents wherever they make sense. Use it for class notes, meeting notes, research, math, worksheets, planning, whiteboarding, storyboards, product sketches, or any project that starts messy and needs room to grow. Write by hand with a stylus, touch, or mouse, type text and Markdown, add shapes and lines, place images and photos, import PDFs, SVGs, and image files, then export your work as PDF, SVG, images, or portable Butterfly files.
Privacy and F-Droid
F-Droid builds Butterfly 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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What is Butterfly?
Butterfly is a free, open-source notes app for Android. Take notes, draw freely, and organize ideas across an endless workspace. It has 2,048 GitHub stars and is released under the AGPL-3.0-only license, and you can install it from F-Droid.
Is Butterfly free and open source?
Yes. Butterfly'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 Butterfly?
You can install Butterfly from F-Droid (package dev.linwood.butterfly); the links are on this page. Its GitHub repository also publishes releases (latest: v2.6.0).
Is Butterfly still maintained?
The repository's most recent commit was on Oct 7, 2026. Its F-Droid listing was last updated on Oct 1, 2026. appsgit only lists apps whose repository had a commit in the last six months.