Boards
Lay anything out on an infinite canvas, with sticky notes, frames and arrows.
Drop anything
Links, photos, voice notes, files, notes. From your phone, the browser, an AI assistant, or a message on Telegram. It all lands in the inbox, to sort later.
Tap a source to send something.
- Nothing here yet
Shared memory for every assistant
What one assistant saves, every other one can find and build on. They all connect to the same Brain over MCP, so nothing stays stuck in one app's chat history.
See who wrote what, and go back
Every note says who wrote it, you or which assistant. Every change is kept, so any edit can be undone in one click.
Then sort it your way
The same notes, links and files, seen however helps right now.
Mind maps
Open any collection as a mind map: what it holds, branch by branch.
Collections
Projects, areas and resources, nested as deep as you like.
Graph
Everything and how it ties together, from [[wikilinks]] to collections.
Search by meaning
Finds what you meant, not only the words you typed. Ctrl K from anywhere.
Public notes
Publish a note as a page anyone can read: an itinerary, an article, a small blog.
Plain Markdown
Notes are Markdown, with live preview, images and [[links]].
Your Obsidian vault, both ways
Import a vault, folders become collections. Export everything as a vault, boards included.
On your phone
Install it as an app and share to Brain from anywhere. Telegram works too.
Connect your assistant
Each app connects a little differently. Pick yours.
Paste this into your assistant. It reads how Brain works and walks you through the rest.
Claude on the web, desktop or mobile
- Open Customize → Connectors → Add custom connector.
- Paste the address below and press Add.
- Press Connect. Brain opens and asks you to allow Claude.
Custom connectors work on every plan (one on Free).
Claude Code
- In a terminal:
- In Claude Code, run
/mcp, choose brain and sign in.
- Open chatgpt.com/plugins, press + and choose Add custom MCP server.
- Name it Brain and paste the address below.
- Accept the warning and create it. ChatGPT sends you to Brain to allow it.
Which plans can add custom MCP servers is up to OpenAI.
- Open grok.com/connectors and choose New Connector → Custom.
- Paste the address below.
- Sign in to Brain when asked.
On Grok Business and Enterprise, an admin adds the connector first.
Ask your Bot in a chat: it adds Brain by its address. Paste this, then sign in to Brain if it asks.
On a team, the Cursor connector policy decides which servers Bots can add.
Questions
Do I need a server?
Yes, for now: any machine that runs Docker, like an Umbrel, a home server or a small VPS. There is no hosted version yet.
What happens to my data?
It stays in the database on your server. Brain sends no telemetry, and search by meaning runs there too. An assistant only gets in when you approve it, and you can revoke it any time.
Does it work without AI?
Yes. Capturing, the inbox, boards, collections, search and the rest work on their own. Assistants are optional.
Install it on your server
Your notes stay on your machine. One Docker Compose stack runs everything.
Docker Compose
git clone https://github.com/CarlosLugones/brain cd brain cp stack.env.example stack.env # your hostname and secrets make prod-up
Umbrel
Not in the Umbrel App Store yet. In Portainer, add a stack from
the repository with
docker-compose.production.yml and the variables in
stack.env.example. A Cloudflare Tunnel gives it HTTPS.