butterfly
A cross-platform, open source note-taking app with an endless canvas for writing, drawing and organizing ideas. It runs on Android, Windows, Linux and the web.
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Share on XLicense: AGPL-3.0
Overview
Butterfly is an open source note-taking app built around an endless canvas. Instead of a fixed page, you place handwriting, text, Markdown, shapes, images and documents wherever they fit. It suits class notes, meetings, research, whiteboarding and planning, and runs on Android, Windows, Linux and the web. Work can be exported as PDF, SVG, images or portable Butterfly files.
Key features
- Endless workspace for notes, sketches and diagrams
- Tunable pens with smoothing, pressure and shape detection
- Mixes handwriting, Markdown, shapes, images, PDFs and SVGs
- Write with stylus, touch or mouse
- Export to PDF, SVG, images or Butterfly files
Best for
People who think visually and want room to arrange notes and drawings freely, on several platforms, with an open source app.
- Upstream
- LinwoodDev/Butterfly
- Fork on GitHub
- Guo-astro/butterfly
- Upstream stars
- 2.1k
- Category
- Apps and everyday utilities
- Language
- Dart
- License
- AGPL-3.0
- Forked
- 2025-11-22
- Sync status
- Updated by last syncLast synced 2026-10-20
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