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Give every AI agent your notes. Stay in control.

Unibrain is one knowledge base shared by Claude, ChatGPT and your own agents. It's plain Markdown in your own GitHub repo, with a signed record of every change and a fast phone app for reading and reviewing what your agents wrote.

Get started Why Unibrain

Your AI helpers forget. Your second brain doesn't.

Every assistant you use keeps its own memory, locked inside its own app. Research you did with Claude isn't there when you ask ChatGPT. The agent running on your server can't see the plan you made on your phone.

Unibrain gives them one shared memory you own. Ask any of them to "research this and save it to Unibrain", and every other agent, and you, can find it later.

  • Every agent, one vault

    Claude (desktop, web, iPhone), Claude Code, ChatGPT, Hermes and any MCP client read and write the same notes through one secure connection.

    Connect your AI

  • Trust built in

    Every change is a Git commit signed with the app and agent that made it. There is no delete tool, and a safety net flags anything that looks like a bad overwrite.

    Trust and safety

  • Your repo, your files

    Notes are ordinary Markdown in a private GitHub repo you own, with full history and nothing to export. Stop using the service and your notes stay right where they are.

    Privacy and security

  • A phone app you'll actually use

    Search, read, tick off tasks, organize and keep folders offline. Diagrams, math and callouts render beautifully, and it installs to your home screen.

    The web app

How it works

flowchart LR
  C[Claude] --> S
  G[ChatGPT] --> S
  K[Claude Code] --> S
  H[Hermes and<br/>other agents] --> S
  P[You, in the<br/>web app] --> S
  S((Second<br/>Brain)) -- "every change is<br/>a signed commit" --> R[(Your private<br/>GitHub repo)]
  1. Create a private GitHub repo for your notes, or use one you already have.
  2. Install the Unibrain GitHub App on that one repo.
  3. Connect your AI apps with a single address: https://unibrain.dev/mcp.
  4. Ask away. Your agents search, read, write and organize. You read and review in the web app.

What people use it for

Research that sticks

"Research Kafka tiered storage options and save a comparison to Unibrain, with sources." Next month, ask ChatGPT about it and it finds Claude's notes.

Plan a trip together

Claude drafts the itinerary, ChatGPT finds restaurants, and you tick off bookings on your phone in Italy, offline.

A team of agents

A weekly agent tidies your notes and proposes cleanups. You approve each one with a checkbox, and every change is signed with its name.

Project memory

Specs, decisions and diagrams for your software projects, kept current by your coding agent and readable on the train.

See all use cases

Built for people who let AI write

Unibrain
Where your notes live Your own private GitHub repo, as plain Markdown
Who can write Any MCP-capable AI app or agent, plus you
Knowing who changed what Every change is a commit, signed with the app and the agent's name
Undoing mistakes No delete tool; full Git history; a safety net flags rollbacks
Reading on the go A phone-first web app with offline folders, tasks, diagrams and math
Lock-in None. It's your repo

Early access

Unibrain is in invite-only early access. Request access and you'll be set up in about 20 minutes.