What your business knows,
but nobody wrote down.
A shared brain that interviews the people who know, writes down what they said, and answers your questions with the source.
Open source and self-hostable.Read the code
- She moved to AntwerpLast monthSaved from her text
- She’s been plant-basedSince JanFrom a chat
- She introduced you to MarcLast yearNote · ‘intros’ brain
Outcomes over organization.
Built for those who do not care where things are stored, as long as they are found, at the right time and in the right place.
How it works.
Capture, and the rest happens on its own.
- Phone
Scan the contracts.
Contracts, invoices, signed letters, the scope doc. Point your camera, and BrainExtension keeps the clauses and dates.
- Browser
Keep the decision, not the tab.
A thread with the answer, a spec, the rate you agreed. One click, and your second brain keeps the substance, not a bookmark that rots.
- Connections
Connect what you already use.
Calendar, email, Slack, Drive, your CRM. Whatever comes in links itself to the clients and people you already have.
- Voice
Or just talk.
Run a handover, a review, a post-mortem. Say what was agreed; your second brain transcribes it and asks a few short questions for what's missing.
Everything you save connects.
Save anything. Your extended brain draws the links itself, so you never file anything.
Your follow-ups stop slipping.
Say you’ll send Priya the deck. BrainExtension catches it, ties it to her, and pings you Friday.
Six months apart, still linked.
A rate card from February sits beside May’s scope call and today’s intro. Your second brain keeps them in one thread.
- MCP · REST API
Integrates with your tools.
Pose the question in Claude or ChatGPT. The answer still comes from your material, plugged in over MCP and REST.
Answers come from what you’ve actually saved.
Every answer names its source.
Last spoke 11 June — migration. An intro to the data team is still open.
Exclude the EU entities, revisit in Q3. Voice memo, 26 May
€1,200 setup + 15%. Proposal, Feb
Reverse charge for EU clients. Handover interview, 4 Feb
You do, since April. Handover in the Acme brain
Open Source on GitHub,
Yours to Self-Host.
BrainExtension will be free and open source under Apache 2.0 license, after completing the private beta & audit.
Open source
On GitHub under Apache 2.0. Read it, fork it, audit it.
Self-hostable
Run it on your own machine. Same code, no account with us.
No lock-in
Swap the model, bring your own key, export every memory.
Private by default
Personal brains stay private. We never train on your content.
Priced per seat, from two.
Every seat carries a private brain and the shared ones. Start with the two people who hold most of it in their heads, add the rest when it has earned the money.
Free
One seat, forever, not a trial
- One brain, one person
- Notes, people and follow-ups in one place
- Automatic links between memories
- Browser extension
- A daily allowance of AI recall
Team
€240 a seat on the year. From 2 seats.
- Shared brains for clients, deals and how you do things
- A private brain per person alongside them
- Follow-ups caught in notes, calls and voice memos
- Voice capture, Telegram and the browser extension
- MCP server and REST API
Business
€590 a seat on the year. From 2 seats.
- Everything in Team
- Voice interviews: handovers, reviews, post-mortems
- Facts rechecked on a schedule
- Bulk import from what the team already has
- The strongest models, and the highest limits
Twenty-five seats and up
Your own region or your own servers, invoiced on the year. We can also run the first round of interviews ourselves and get a hundred things out of people’s heads before anyone logs in.
capture engagement quoted separately
Prices exclude VAT, per seat, two seats minimum. Swap people in and out any month. Self-hosting is free at every tier.
Start a brain for your business.
€24 a seat, from two seats. Leave your email and we’ll set one up with you.
One email when your invite is ready. Nothing else.