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TriliumNext Notesflatnotes
Free

Free and open source under the AGPL 3.0.

 Free

Free to self-host from the public GitHub repository.

Windows, macOS, Linux, Web, Self-hosted Web, Self-hosted
  • Cloning puts one note in several places without copying it
  • Rich text, code notes, canvases, Mermaid diagrams and relation maps
  • No database; notes are plain Markdown files
  • Flat folder storage is easy to back up or sync
  • Notes live in a database, not plain files, so lock-in is real
  • The interface is dense and takes a while to get comfortable with
  • Requires running your own server
  • Flat folder structure offers little hierarchy for large collections
Downloadable app, Self-hosted Self-hosted
Open source Open source
License: AGPL-3.0 License not stated
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked September 24, 2026

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