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SaberLinwood Butterfly
Free

Free and open source.

 Free

Free and open source under the AGPL-3.0 licence.

Windows, macOS, Linux, Android, iOS Linux, Android, Web
  • Built specifically for handwriting and stylus input
  • Runs on Android, iOS, Windows, macOS and Linux
  • Infinite canvas instead of fixed pages
  • Strokes and elements stay editable after placing them
  • Focused on handwriting, less suited to typed notes
  • Best experience needs a device with a stylus
  • Freeform canvas suits handwriting more than structured text notes
  • Infinite canvas documents can be harder to navigate than linear notes
Downloadable app Downloadable app, Web application
Open source Open source
License not stated License: AGPL-3.0
Not stated if an account is needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 23, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.