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One memory for every AI you use

Claude doesn't know what you told ChatGPT, and every new chat starts from zero. GBrain gives all of them one memory of who you know and how you execute.

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Bringing a team? See GBrain Teams.

Backed by YC Built by Garry Tan

Tell one AI, and every AI you use knows it

Tell Claude about a customer, and ChatGPT knows it in the next chat. Change the plan in one Claude Code chat, and the others already have it.

  • A page for every person and company you deal with
  • Plain files you can read, correct and take with you
  • Gmail, the calendar and meeting notes, connected once

Everything in Personal

One price for one person. The memory, the skills and every application are in it, and your own Claude or ChatGPT does the thinking, so there is no AI credit to buy.

Set up in three steps

Nothing to install, and no server to run.

  1. Step 1: Connect Claude or ChatGPT

    Press Connect my AI and paste one address. Claude Code, Codex, Capy and Cursor connect the same way.

  2. Step 2: Add Gmail and the calendar

    Sign in to each once. GBrain holds the sign-in, and no AI ever sees a password.

  3. Step 3: Run your first skill

    Ask your AI to run Learn How I Talk. GBrain reads your mail, files every person and company, and learns how you write.

Skills that put the memory to work

The three most founders start with. Each runs in the Claude or ChatGPT you already have, once or on its own scheduled tasks.

  • Replies that sound like you

    GBrain reads your Gmail into memory: every person, every company, and how you write to each. Dictate to Claude, and the draft comes back in your voice.

    Skill: Learn How I Talk

  • A brief before every call

    Before a sales call, ask for a brief: who they are, what they reached out about, what you said last time, and what to show them.

    Skill: Deep Person Brief

  • An inbox that clears itself

    GBrain learns what you archive and clears it out on Claude's or ChatGPT's own scheduled tasks, so the inbox is only what needs you.

    Skill: Inbox Cleanup

Already running open-source GBrain manually? Bring it along

Import your notes as markdown, and stop updating an install and hosting MCP for each agent. Every AI reaches the same memory at one address.

How to import notes into GBrain

Questions before you start

Which AIs does it work with?

Claude, ChatGPT, Claude Code, Codex, Capy and Cursor, and any other AI that connects over MCP. They all share the same memory.

How do skills run on their own?

On Personal, a skill that repeats, like clearing the inbox, runs on Claude's or ChatGPT's own scheduled tasks. GBrain Teams runs skills in the cloud, with your laptop closed.

Can I bring my team in later?

Yes. Upgrade to GBrain Teams, the plan for a whole team: everyone shares one memory, GBrain gets its own AI to chat with, and skills run in the cloud with your laptop closed. It is the same workspace, and everything it learned stays. Compare the plans.

How do I cancel?

Manage billing, on your Billing page, opens Stripe, which holds the card and the invoices. The memory stays yours to export.

More questions

Start with your email

Connect Claude or ChatGPT, add Gmail, and run your first skill. GBrain starts filing everyone you know from the first batch of mail.

Get started Bringing a team? See GBrain Teams