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Knowledge Base 2 alternatives tracked

Open-source alternatives to Obsidian

Obsidian is a local-first Markdown note-taking app with a plugin ecosystem of 1,000+ community plugins, backlinks, graph view, and optional sync. It stores notes as plain Markdown files on your local filesystem — you own the data format entirely. A growing portion of its user base uses it as a personal knowledge management system with Zettelkasten or linking-based workflows.

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The alternatives

logseq

★ 42,676 Clojure AGPL-3.0

A privacy-first, open-source platform for knowledge management and collaboration. Download link: http://github.com/logseq/logseq/releases. roadmap: https://logseq.io/p/NX4mc_ggEV

logseq/logseq Updated 2026-05-06

Trilium

★ 35,885 TypeScript AGPL-3.0

Build your personal knowledge base with Trilium Notes

zadam/trilium Updated 2026-05-05

Comparison notes

Obsidian is source-available (not OSS), free for personal use, with paid tiers for commercial use and Obsidian Sync. Logseq is fully AGPL-licensed with similar local-first Markdown storage, a block-based editor, and daily notes. Trilium (AGPL) offers a hierarchical note structure with self-hosting and end-to-end encryption. The main gap vs. full OSS: Obsidian's plugin ecosystem is larger than any OSS alternative. Logseq's block-based DB mode (still in development) moves away from plain-file storage, changing its data ownership guarantees. For users who want fully OSS plus self-hosting: Trilium is the most complete option.

Migration tips

  • Obsidian stores your vault as local Markdown files — simply copy the vault folder to your new tool's import path
  • Obsidian's internal [[link]] format is compatible with Logseq and most Markdown-based OSS tools
  • Obsidian Sync can be replaced by Syncthing (OSS) for cross-device sync without Obsidian's managed sync
  • Plugin functionality will not transfer — audit which Obsidian plugins you rely on and find Logseq or Trilium equivalents
  • YAML frontmatter in Obsidian notes transfers to Logseq and Trilium as note properties

FAQ

Can I fully replace Obsidian with an OSS tool?

Feature parity varies. Most OSS alternatives cover 70-90% of core workflows, but may lack polish, integrations, or specialized features. Pilot the alternative with a subset of your team before fully committing.

What's the cost of self-hosting?

Plan for ~$5-50/month in VPS costs (DigitalOcean, Hetzner, etc.) plus 2-8 hours/month in maintenance. For a team of 20+, self-hosting usually breaks even against SaaS pricing within 6-12 months.

Which alternative should I pick?

Sort by GitHub stars (a proxy for community health), check the last-pushed date (avoid unmaintained projects), and read recent issues to gauge responsiveness.