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TheBrainHeptabase
Free

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

 Paid

Paid subscription, no permanent free tier mentioned.

Windows, macOS, Linux Windows, macOS, Web
  • Ideas can link to many contexts without duplication
  • Long-developed product with a large user base
  • Whiteboard and card format suits visual thinkers and complex research
  • Cross-platform availability across desktop and web
  • Network-style interface takes time to learn
  • Not open source
  • Paid subscription required to use
  • Visual, card-based workflow takes longer to set up than plain text notes
Downloadable app Downloadable app, Web application
Closed source Closed source
License not stated License not stated
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 October 2, 2026

Checked September 22, 2026

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