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LinwoodDev/Butterfly

Open-source, cross-platform note-taking app built on an endless canvas for handwriting, drawing, Markdown, and mixed media.

Open-source alternative to:GoodNotesNotabilityMicrosoft OneNote

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Last commit
yesterday

Key features

  • 01Customizable pen tools with smoothing, pressure behavior and shape detection
  • 02Mixes handwriting, Markdown, shapes, images, PDFs and SVGs on one canvas
  • 03Multi-page documents with folders, layers and named areas
  • 04Local-first storage with WebDAV and Nextcloud sync options
  • 05Export to PDF, SVG, images or portable Butterfly files
  • 06Experimental end-to-end encrypted collaboration

Use cases

  • Taking class or meeting notes with sketches and diagrams on one page
  • Planning projects, storyboards or whiteboard-style brainstorming
  • Annotating imported PDFs and worksheets by hand
  • Keeping notes offline on a tablet with a stylus

Topics

#note-taking#drawing#flutter#markdown#cross-platform#whiteboard#offline-first#self-hosted#android#app

FAQ

What is Butterfly?
Open-source, cross-platform note-taking app built on an endless canvas for handwriting, drawing, Markdown, and mixed media.
Is Butterfly free to use? What license does it have?
Butterfly is open source under the AGPL-3.0 license. Check the license terms before using it in commercial products.
Is Butterfly still maintained?
Actively maintained. The last commit to Butterfly was on Oct 18, 2026.
What can I use Butterfly for?
Taking class or meeting notes with sketches and diagrams on one page Planning projects, storyboards or whiteboard-style brainstorming Annotating imported PDFs and worksheets by hand Keeping notes offline on a tablet with a stylus
Where can I get Butterfly?
The source code and installation instructions are on GitHub: https://github.com/LinwoodDev/Butterfly

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