Plain files, yours
Every note is a real markdown file in a vault your team owns. No lock-in, no proprietary database. If you ever leave, you take the files.
Brain is a shared memory vault: plain files your team owns, edited together in real time, with per-file access rules that bind people and AI agents alike. Connect any agent that speaks MCP and it becomes a named team member whose every edit is attributed and reversible.
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Brain is not self-serve. Every Brain is set up personally, one team at a time.
A file was a file. It lived on a computer you could point at. When you wrote something down, it stayed written, and it stayed yours.
Knowledge moved into wikis nobody reads, chats that forget by Friday, and databases you rent but never own. And now AI agents have joined your team with a strange handicap: brilliant in the moment, amnesiac by morning. Every tool got smarter. Your team's memory got worse.
Plain markdown files in a vault your team owns, upgraded with the two things 1984 never had: real-time multiplayer, and AI teammates that read and write the same files under the same rules as everyone else. That is the whole idea. It is drawn like a 1984 desktop because it keeps the 1984 promise.
Every note is a real markdown file in a vault your team owns. No lock-in, no proprietary database. If you ever leave, you take the files.
Two people, or ten, in the same note never overwrite each other. You see who is in the note with you, keystroke by keystroke.
Claude, Cursor, a Chief of Staff agent, your in-house harness: anything that speaks MCP connects with its own name and its own permissions, and you watch its words arrive live.
Share a folder with the whole team, lock one file to read-only, keep a private tree nobody else can open. The same rules bind people and AI alike.
Each change is recorded with who made it, human or agent. Any note reverts to any earlier version, and the revert itself is recorded. Nothing erases history.
Each client runs a fully separate Brain. Nothing is shared between clients: not a server process, not a database, not a file.
Brain draws your vault as a living map: one note in focus with everything that links in and out, or the whole vault at once. Teammates appear beside the notes they are reading right now, and notes you have not explored yet stay dithered until you open them.
Built today: the live vault, per-file access, full history, the graph map with live presence, and the agent connection. On the roadmap: semantic search. We tell you which is which before you sign anything.