This server offers rich memory features with semantic search, automatic linking, and multiple capture methods, and flexible deployment. Main limitation is that it requires a Cloudflare account and self-hosting, suited for personal use. Data control and privacy are highlights, but users take on operational responsibility.
Second Brain is a self-hosted MCP server that provides a unified persistent memory layer for AI tools like Claude, ChatGPT, Cursor, and Codex. It runs on your own Cloudflare account, using Cloudflare Workers, D1, Vectorize, and Workers AI for semantic search and memory management. Supports saving from multiple sources including CLI, browser extension, Obsidian plugin, iOS Shortcuts, Notion sync, calendar, and email capture. Data is fully under your control with OAuth authentication supported.
Install Second Brain in three ways: 1) Desktop app (recommended): Download for Mac/Windows, follow guided setup in about two minutes. 2) One-click Cloudflare deploy: Click 'Deploy to Cloudflare', enter dimensions 384, cosine metric, and your AUTH_TOKEN; after deployment, copy your Worker URL. 3) Manual deployment: Clone the repo, run npm install, npm run vectors:create, and npm run deploy. Then connect AI clients via curl scripts or manual configuration.
{
"mcpServers": {
"second-brain": {
"url": "https://YOUR-WORKER-URL/mcp",
"headers": {
"Authorization": "Bearer YOUR-AUTH-TOKEN"
}
}
}
}