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Knowledge Graph & Personal Knowledge Management (PKM) · Vendor file

Obsidian

obsidian.md

The free and flexible app for your private thoughts.

Categories Obsidian serves

The B4 Index places Obsidian in one category. Each category page lays out the build-versus-buy considerations for that decision.

Knowledge Graph & Personal Knowledge Management (PKM) Primary Free core; Sync $4/user/month; Commercial license per-seat

Obsidian compared

Obsidian vs Joplin Obsidian vs Anytype
The B4 Index scores every software category on two axes, strategic differentiation and AI feasibility, to classify it Build, Buy, Bridge, or Beware. Vendor facts here are independent of that call. See the full methodology.