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TiddlyWikiObsidian
Free

Free and open source.

 Free

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

Web Windows, macOS, Linux, Android, iOS, Browser extension
  • Whole notebook is one portable HTML file
  • Non-linear notes that can be tagged and linked
  • 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
  • Saving a single-file wiki from a browser can need extra setup
  • The tiddler model takes time to learn
  • 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, Web application Downloadable app, Browser extension
Open source Closed source
License not stated License not stated
No account needed No account needed
Not stated if it works offline Works offline

Checked September 23, 2026

Checked September 20, 2026

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