Your extended brain
that builds itself.
Save anything from your phone or your browser. Ask a question, get an answer with its 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 any document.
Point your camera at a contract or a letter. BrainExtension reads the page and keeps the dates that matter.
- Browser
Keep what made the page worth saving.
One click. A thread keeps its best answers, a recipe keeps the method. Not a bookmark that rots.
- Connections
Connect what you already use.
Calendar, email, Notion, Drive. Whatever comes in links itself to the people and notes you already have.
- Voice
Or just talk.
Say what happened. If a detail's missing, your second brain asks a few short questions until it has the story.
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.
5mg lisinopril, mornings, review in six weeks. GP note, 18 June
Exclude the EU entities, revisit in Q3. Voice memo, 26 May
Pasta con la mollica — in your Sicilian dinners brain. Want it for four?
€1,200 setup + 15%. Proposal, Feb
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.
Start free.
One brain, fully yours, forever. Not a trial. Pay when you want more brains or heavier use.
Free
Forever, not a trial
- One brain
- Notes, people and follow-ups in one place
- Automatic links between memories
- Browser extension
- A daily allowance of AI recall
Pro
€190 a year, two months off
- Multiple brains: work, personal, one per client
- Higher memory limits and monthly AI recall
- Follow-ups caught in notes and voice memos
- Voice capture and Telegram
- MCP server and REST API
Max
€590 a year, two months off
- Everything in Pro
- Voice interviews that write themselves down
- Facts rechecked on a schedule
- Invite others into a brain, plus bulk import
- The strongest models
Sharing it with other people?
Two colleagues or twenty, everyone under one roof, or both. The brain works the same way. The bill is the thing that changes.
Prices exclude VAT. Self-hosting is free at every tier.
Start with one question.
We’re opening in batches. Leave your email and we’ll send you an invite.
One email when your invite is ready. Nothing else.