Obsidian vs Notion vs Logseq – which for second brain?

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Want to build a second brain system. Obsidian is local-first with backlinks. Notion is cloud-native but data ownership concerns. Logseq is open source outline-mode.

Use case: personal knowledge management, research notes, project planning

Which one actually helps you think better?

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student here – using obsidian for thesis notes and its been life changing

the linking between notes is exactly what i needed for research

notion felt too cloud-y and i like having my files locally

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obsidian is king for personal knowledge management

the plugin ecosystem is insane – you can customize it to death

notion is good if you need to share with team but i prefer local-first

logseq is interesting but feels like its still figuring itself out

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Obsidian for power users, Notion for teams

Using all three for different purposes:

  • Obsidian: Local-first, best backlinks, highly customizable with plugins. The graph view is amazing for connecting ideas.
  • Notion: Best for collaboration, all-in-one workspace. But privacy concerns and subscription costs.
  • LogSeq: Open source, outline-based, great for hierarchical thinking. Still maturing but promising.

My choice for second brain: Obsidian – the graph alone is worth it.