The Second Brain
Self-hosted AI memory layer. Works with Claude, ChatGPT, Cursor.
Second Brain is a self-hosted memory layer that gives Claude, ChatGPT, Cursor, and any MCP-compatible AI client persistent memory across sessions.
Store notes, decisions, and context once. Recall them by meaning not keywords using semantic vector search. Includes a web UI for browsing and managing memories, an Obsidian plugin for syncing your vault, and capture tools for browser and iOS.
Built on Cloudflare Workers, D1, Vectorize, and Workers AI. Runs entirely on the free tier....