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KleverNotesObsidian
Free

Free and open source under the GPL-3.0 licence.

 Free

Free for everyone, including commercial use, in the vendor’s own words. Obsidian Sync and…

Linux Windows, macOS, Linux, Android, iOS, Browser extension
  • Markdown-based notes
  • Native KDE application
  • Notes are plain Markdown files in a folder you control, readable without the app
  • Linking, backlinks, tags, graph view and fast search across the vault
  • Linux only
  • Younger project than established note apps
  • The application is not open source, only the plugin ecosystem and the releases repository
  • Syncing between devices means paying for Obsidian Sync or wiring up your own sync tool
Downloadable app Downloadable app, Browser extension
Open source Closed source
License: GPL-3.0-or-later License not stated
No account needed No account needed
Works offline Works offline

Checked October 1, 2026

Checked September 20, 2026

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