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HeynoteSideNotes
Free

Free download with source code on GitHub.

 Paid

Commercial Mac app from Apptorium; check the developer's site for current pricing.

Windows, macOS, Linux macOS
  • Blocks with per-block language, highlighting and auto-format
  • Built-in calculator blocks with units and currencies
  • Notes panel appears at the screen edge without app switching
  • Markdown, tasks, images and colors in notes
  • A scratchpad rather than a full note organiser or editor
  • Mac only
  • Suited to quick notes rather than a large knowledge base
Downloadable app Downloadable app
Closed source Closed source
License not stated License not stated
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked October 1, 2026

Checked September 24, 2026

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