Your AI second brain. Owned by you. Works with every AI.
Keep what you know about your work and life in one place. Claude, ChatGPT and other AI apps read it, so you stop repeating yourself. Nothing changes without your OK.
You're on the list
We'll email you when there's a place in the beta.
What your AI can and can't do
| Read your pages when you ask it something | Yes |
| Save a note to your inbox | Yes |
| Suggest a change to a page | Yes, you approve it |
| Edit or delete your pages by itself | Never |
Every change is kept in the page's history, so you can go back.
How it works
Connect your AI
Add Second Brain to Claude or ChatGPT in a few clicks. Sign in with email or Google.
Talk as usual
Say “save this to my brain”. The note lands in your inbox. Your AI looks things up in your brain when it helps.
Approve what sticks
Your AI suggests where each note belongs. You see exactly what would change and say yes or no.
Your data
Pages are plain Markdown files. Download all of them any time, or delete your account and everything with it. Data is encrypted in storage and in transit.
Works with
Claude (web, desktop, Claude Code), ChatGPT (chatgpt.com), Codex, and any app that supports MCP connectors.
Privacy notice (short version)
- The waitlist stores your email address and when you agreed to be contacted. We use it only to email you about the beta, and delete it if you ask.
- This site has no advertising or analytics trackers.
- In the beta, the AI apps you connect (for example Claude or ChatGPT) can read every page in your brain, and their companies handle that data under their own terms. Don't store anything you wouldn't share with them, and turn off model training in each app.
- Don't store other people's medical or health information.
The full privacy policy and terms are being reviewed and will be published before the beta opens.