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NoteDiscoveryObsidian
Free

Free and open source under the MIT license.

 Free

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

Web, Self-hosted Windows, macOS, Linux, Android, iOS, Browser extension
  • Keeps notes in plain Markdown files
  • Includes search, wikilinks, and graph browsing
  • 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
  • Designed to run on a server you provide
  • 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
Web application, Self-hosted Downloadable app, Browser extension
Open source Closed source
License: MIT License not stated
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked October 8, 2026

Checked September 20, 2026

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