Knowledge Graph & Personal Knowledge Management (PKM) · Vendor file
Obsidian
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The free and flexible app for your private thoughts.
Active · verified September 2026
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
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.