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. One-click deploy provisions everything in your own Cloudflare account. Your data never touches a third party after setup.

Features semantic search via vector embeddings, time decay reranking, duplicate detection, and an append tool for updating existing memories without creating conflicts.

MIT licensed. Open source.

Features

  • Semantic vector search with time decay reranking
  • Obsidian plugin, web dashboard, iOS Shortcuts, browser bookmarklet
  • One-click deploy on Cloudflare free tier
  • Duplicate detection and smart chunking for long notes
  • Web dashboard to browse, search, and manage memories

Project Samples

Second Brain Screenshot 1

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Categories

Semantic Search

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Additional Project Details

User Interface

Web-based

Registered

2026-05-18
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