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Mobile app · Office & notes

Butterfly

Take notes, draw freely, and organize ideas across an endless workspace.

  • Completely free
  • Windows, Linux, Android and the web
  • Open source
  • No account

Overview

Butterfly is a note-taking mobile app, available on Windows, Linux, Android and the web.

Features described in its F-Droid listing and in its GitHub repository: Markdown support, PDF export and offline use.

File formats mentioned: PDF and SVG.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “🎨 Powerful, minimalistic, cross-platform, opensource note-taking app” — GitHub, 10 November 2026
  • “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…” — F-Droid, 10 November 2026
  • “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…” — F-Droid, 10 November 2026
  • “Work offline, store documents on your device, choose a different data directory, or connect WebDAV and Nextcloud if you want your own sync setup.” — F-Droid, 10 November 2026

At a glance

Butterfly is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (AGPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • No account needed
  • No advertising
  • Commercial use allowed

Sources and checks

  • Facts collected from GitHub (credit card, account, source code, publisher, licence, free status, platforms, commercial use) —
  • Facts collected from Winget (Windows Package Manager) (credit card, account, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) —
  • Last technical check: 6 November 2026
  • Description from F-Droid — F-Droid (citation courte)

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