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SideNotesSimplenote
Paid

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

 Free

The software is free under its open-source licence. Hosting, hardware and external…

macOS Windows, macOS, Linux, Android
  • Notes panel appears at the screen edge without app switching
  • Markdown, tasks, images and colors in notes
  • Syncing is free and unlimited across every platform, notes keep a version history, and the whole thing stays…
  • Mac only
  • Suited to quick notes rather than a large knowledge base
  • There is no encryption of note contents on Automattic's servers, and no attachments, folders or rich formatting.
Downloadable app Downloadable app
Closed source Open source
License not stated License: GPL-2.0
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 24, 2026

Checked September 22, 2026

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