What is Second Brain for AI?

Second Brain for AI is a self-hosted memory layer that persists your context across every AI tool you use. Instead of starting each conversation from scratch, you store your projects, decisions, and preferences once—then recall them by meaning, not exact keywords. It works with Claude, ChatGPT, Cursor, and any MCP client, and runs on Cloudflare with a free tier. Your data stays in your own account, and the project is MIT licensed.

Who it's for

• Power users who juggle multiple AI assistants and are tired of re-explaining context every time they switch tools
• Developers and technical teams who want a programmable, self-hosted memory layer they can integrate via CLI, API, or MCP
• Privacy-conscious individuals who refuse to let any single platform own their accumulated knowledge and decisions

Key features

Semantic recall

Second Brain finds memories by meaning, not exact wording. Asking "what did I decide about the pricing model?" surfaces the right note even if you never used those exact words when you saved it. This makes retrieval feel natural and forgiving.

Duplicate detection and append

The append command adds updates to an existing entry without creating duplicates. You can layer new information onto a memory over time, keeping a clean, evolving record instead of a messy pile of notes.

Multi-tool capture

You can store context from your terminal (brain remember), Obsidian (via the community plugin), iOS (with one-tap shortcuts), a browser extension, or directly inside any AI conversation. Memory gets filled wherever your context naturally lives.

Self-hosted on Cloudflare

The entire system runs on Cloudflare Workers, D1 SQLite, and Vectorize. At personal scale, it's free. Your data stays in your own Cloudflare account—no platform controls it, and no platform can take it away.

What stands out

One shared memory, available in every AI tool you use—and unlike built-in memory inside any single app, this one is yours.

Most AI tools offer isolated memory that stays locked inside their ecosystem. Second Brain breaks that wall by giving you a single, portable memory layer that works across Claude, ChatGPT, Cursor, and any MCP client. You own the infrastructure, the data, and the access tokens. No platform can revoke your context or hold it hostage.

Worth checking out if…

You use multiple AI tools regularly and want a unified, self-hosted memory that follows you everywhere. If you value privacy, semantic search, and the ability to capture context from your terminal, browser, phone, or note-taking app, Second Brain is a practical, MIT-licensed solution that puts you in control.