Atomic – self-hosted, semantically-connected personal knowledge base
Self-hosted Obsidian rival with native MCP server and sqlite-vec semantic search built-in.

Self-hosted Mem.ai alternative with MCP integration and native iOS app support.
Privacy-focused researchers, developers, and knowledge workers
Mem.ai · Obsidian · Logseq
Self-hosted Obsidian rival with native MCP server and sqlite-vec semantic search built-in.
LLM compiles knowledge into wiki pages instead of RAG retrieving raw chunks.
Friction-free capture (no categories) plus semantic search feels genuinely different from Notion.
MCP integration with Cursor and Claude Code sets this apart from generic RAG tools.
Postgres + pgvector + MCP integration solves the AI amnesia problem better than vector DB silos.
Agents leaving notes for other agents via MCP is a clever pattern for tribal knowledge.