Atomic vs OpenKnowledge

Comparing two open source alternatives to Notion . Use the comparison below to decide which one fits your needs.

Atomic

MIT

A self-hosted personal knowledge base that turns markdown notes into an AI-augmented knowledge graph with semantic search and wiki synthesis.

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OpenKnowledge

GPL-3.0

AI-native, local-first markdown editor and LLM wiki with built-in integrations for Claude, Codex, and other agents.

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Side-by-side comparison

	Atomic	OpenKnowledge
License	MIT	GPL-3.0
Self-hostable	Yes	Yes
GitHub Stars	1,566	530
Forks	105	15
Open Issues	33	1
Last Commit	Jun 21, 2026	Jun 26, 2026
First Released	Nov 25, 2025	Jun 3, 2026
Categories	Note Taking & Knowledge Management Tools	Note Taking & Knowledge Management Tools
Tags	#note taking #markdown #knowledge-management #LLM #local ai	#markdown #notes #ai #second-brain #agents

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