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TheBrainObsidian
Free

The desktop app is free according to the developer's site.

 Free

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

Windows, macOS, Linux Windows, macOS, Linux, Android, iOS, Browser extension
  • Ideas can link to many contexts without duplication
  • Long-developed product with a large user base
  • 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
  • Network-style interface takes time to learn
  • Not open source
  • 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
Closed source Closed source
License not stated License not stated
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked October 2, 2026

Checked September 20, 2026

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