A man at a charcoal desk beside a tall window, laptop open, green rooftops outside.

Different tools.
Same memory.
Still you.

Give your AI tools a shared memory. So the decisions, ideas, and preferences you save in one are there when you need them in another.

Get Second Brain See how it works

Free & open source · Mac & Windows
Set up in your own Cloudflare account.

Connect the tools
you already think with.

Claude

ChatGPT

Codex

Cursor

Devin Desktop& other MCP clients

Save it in one tool.
Ask in another.

Pick a sample memory and watch it travel from the tool that saved it to the one that needs it next.

See how the pieces connect

Saved in Codex

We’re launching the new website on Friday.

A project decision worth keeping

Your other tools

Notes. Ideas.
Decisions. All here.

One connected memory

Second Brain

In your own Cloudflare account

Recalled in Claude

“When are we launching?”

Your new website launches on Friday.

Source: memory saved by Codex

Illustrative example

Your next conversation.Already up to speed.

There is a real one on this site. An assistant reports a week of work, then explains that it read that work from four differently tagged tools and did none of it itself.

Read the real conversation
How this site was built

A woman smiling at her phone on concrete steps outside a glass building, greenery behind her.

How do you know all this? Not all of this was done in Claude.

“I didn’t do any of that work. I just read what those sessions wrote down afterward.”

codexclaudeclaude-desktopemail-icloud

An excerpt from a real exchange with the maintainer’s own second brain. Private details and third-party names are removed.

Spend less time catching AI up.
Get back to your thinking.

Pick up where you left off

Open a new conversation and ask where a project stands. Saved decisions and open threads are available to the connected tool you’re using.

Change tools without losing the thread

Explore an idea in one app, build it in another. Both can draw on the same saved context.

Keep the details that make it yours

Writing preferences, project constraints, lessons learned. Give your tools something more useful than another introduction.

Build something you can keep

Your memory lives in your Cloudflare account. Browse it, change it, export it, or delete it. The software is open source.

One brain for the team.A private one for each.

Team Edition runs on the same Worker at no extra charge. Everyone gets a private layer nobody can read, plus a shared layer that fills only when someone shares on purpose. Admins manage people; they cannot read anyone’s private memories. No paid team tier, ever.

How team brains work