What is Second Brain?
Second Brain is a self-hosted memory layer for Claude and any MCP-compatible AI client. It gives your AI persistent, searchable memory across sessions using semantic search instead of keywords.
How to use Second Brain?
Deploy Second Brain with one click on Cloudflare’s free tier. Once deployed, it works with Claude Desktop, Claude Code, and claude.ai. No explicit installation commands or config keys are documented in the README.
Key features of Second Brain
- Five tools: remember, recall, list_recent, forget, append
- Semantic vector search by meaning, not keywords
- Duplicate detection blocks near-exact matches before storage
- Long notes are automatically chunked before embedding
- Built on Cloudflare Workers, D1, Vectorize, and Workers AI
- Runs entirely on the free tier with one-click deploy
Use cases of Second Brain
- Persistent memory across chat sessions for Claude
- Searchable knowledge base without exact keyword matching
- Tag-based chronological browsing of stored notes
- Updating previous entries with new timestamps
- Deleting outdated or incorrect memory entries
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