cobrain
Create your brainGo to your brain
Use cases

What you do with it, case by case.

Your AIs share nothing with each other: every chat and every assistant starts from zero. Cobrain is the memory they all connect to, plain Markdown notes that Claude, ChatGPT, Claude Code or Cursor read and write.

Work

Agencies: every client's tone of voice, in every AI

Write each client's tone of voice once. Everyone in the agency, with Claude or ChatGPT, starts from the same rules, and a change is made in one note.

ReadWork

A new colleague who doesn't need everything explained twice

Share one folder with a new colleague on day one. Their own AI reads the client's rules, decisions and history, and you only answer what the notes don't cover.

ReadWork

Handing work over from Claude to ChatGPT, without copy and paste

One person builds a report with Claude, the next one finishes it with ChatGPT. The data and the reasoning sit in shared notes, so nothing has to be exported or explained.

ReadWork

Work notes that end up in the right place

Stop losing work notes in chat history. Say «save this in the right place» and your AI files it under the client or project, for whichever AI you open next.

ReadWork

A company knowledge base that people actually ask

Procedures, price lists and rules in one brain. Each team gets only its folder and asks its own AI, which sees what that person sees and nothing more.

ReadProfessionals

Law firms: where a case stands, for whoever covers it

One note per client with facts, hearings and decisions. The colleague covering a hearing asks their own AI and knows where the case stands, without a briefing.

ReadProfessionals

Property managers: thirty buildings, one memory

One folder per building, updated by your AI after every call or meeting. Before the next one, ask what is still open. Works for anyone with many similar clients.

ReadPersonal

Home renovation: two people, two AIs, one memory

One of you tells their AI what was bought and what it cost. The other asks their own ChatGPT, free plan included, and gets the answer from the same notes.

ReadPersonal

A food diary your AI doesn't forget on day four

Tracking food with an AI breaks when you open a new chat. Keep the memory outside it: after three weeks you have a history you can turn into a table, not a lost chat.

ReadPersonal

A gym log that remembers the weights

After each workout tell your AI what you lifted. It updates the plan note and suggests the next step; months later it answers from your own history, not from guesses.

ReadPersonal

Personal thoughts that stay yours

Not everything you tell an AI is work. Keep those thoughts in Markdown notes you own and can export, instead of scattered chat histories on three platforms.

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Free, no card needed

Start with a single note.

It is free and no card is needed. You sign in with a link sent by email, connect your AI and start building a memory that does not stay locked inside a chat.

Create your brain, freeGo to your brainA thousand notes, as many AIs as you want to connect.