Atomic

Atomic is a self-hosted personal knowledge base that stores information as atoms — markdown notes that are automatically chunked, embedded, and linked by semantic similarity. It builds a knowledge graph from your notes and lets you explore connections on a spatial canvas powered by force-directed layout.

Key features include semantic vector search (sqlite-vec), LLM-powered wiki synthesis that generates articles from your notes with inline citations, an agentic chat interface for RAG-style conversations with your knowledge base, automatic tag extraction, RSS feed sync, a browser extension for web clipping, and an MCP server for Claude integration. AI providers are pluggable — use OpenRouter for cloud models or Ollama for fully local AI.

Atomic runs as a Tauri desktop app (macOS, Windows, Linux), a self-hosted Docker server, or deployed to Fly.io. A native iOS SwiftUI app is also available. Compared to Obsidian, Atomic has AI-powered synthesis and semantic search built in without plugins; compared to NotebookLM, it is fully self-hosted and supports local AI via Ollama; compared to Notion, it is open source and designed around a personal, linked knowledge graph rather than collaborative databases.