Every element stays editable
Move, resize, recolor, and reorganize content after placing it. Your first attempt never has to be your final one.
Linwood Butterfly
Your ideas should not have to fit inside a page. Handwrite, sketch, annotate, and organize on an infinite canvas that stays yours.
A workspace for visual thinkers
Section titled “A workspace for visual thinkers”Capture lecture notes with a stylus, mark up a PDF, sketch an interface, build a diagram, plan a project, or mix all of them in the same document.
Tune every stroke
Section titled “Tune every stroke”Draw with a stylus, touch, or mouse. Adjust stroke width, color, smoothing, and texture. If a mark is not quite right, edit it instead of starting over.
Powerful when your projects grow
Section titled “Powerful when your projects grow”Common media in one document
Import camera photos, gallery images, PDFs, and SVGs. Combine them with your own notes and export clean results in common formats.
Reusable building blocks
Turn favorite layouts into templates and frequently used content into packs, stamps, palettes, and styles available across documents.
Tools for every idea
Go beyond pen and eraser with labels, shapes, polygons, rulers, grids, textures, stamps, a laser pointer, presentation tools, and more.
Make Butterfly fit your workflow
Section titled “Make Butterfly fit your workflow”Start with a template that brings together your favorite backgrounds, tools, layers, areas, and pages. Save reusable content in packs so your next project starts with everything you need.
Works everywhere
Section titled “Works everywhere”Take your canvas from your desk to your next class or meeting. Butterfly runs on Android, Windows, macOS, Linux, and in your browser, with an iOS preview also available.
Your work belongs to you
Section titled “Your work belongs to you”Local by default
Keep working without an internet connection. Your documents live on your device unless you choose to save them somewhere else.
Bring your own cloud
Connect WebDAV services like Nextcloud to sync, back up, and edit your notes anywhere.
Open source software
Butterfly is free and open source under the GNU AGPL-3.0 license. Keep your documents in its documented .bfly and .tbfly formats.
Create together
Experimental collaboration supports end-to-end encrypted sessions through Swamp or a WebSocket server you host yourself.
Butterfly, the limitless canvas for visual thinking.
Download ButterflyInstall the app on your phone, tablet, or computer.
Try the web appStart a canvas in your browser without installing anything. Chromium-based browsers are recommended.
Read the Butterfly blogFollow releases, project news, and stories from development.
Learn the essentialsCreate your first document and explore the complete toolbox.
Butterfly is built in the open and available in many languages. Join the community to share feedback, help with translations, or contribute to the project.