Your AI-curated second brain
Build your own private knowledge base, or a shared one. A second brain for you and the AIs you use.
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Why we built this
When we went AI-first, at work and at home, one thing became clear.
Context is key
Without your own knowledge base, your AI is working in the dark. And keeping on top of it all by hand took far too long.
So we let AI do it. It builds your knowledge base and keeps it in order. It lives here, not inside one tool, so every AI you use shares it.
It changed how we work. We hope it does the same for you.
The Brain Supply team
What you get
Map what matters to you
Write down the parts of your life you care about, what you're aiming for, and what you're working on.
Your AI gets to know you
It files what you add and keeps it in order, and learns your goals and the things you love doing along the way.
Get there sooner, together
Your second brain grows as you use it, and you and your AI both draw on it to reach your goals faster.
Everything in one brain
Brain Inbox
Notes, links, files and photos wait here until a curator files them.
Brain Bank
Everything you know, sorted by topic and tag, with every version kept and the original each piece came from.
Knowledge map
Your Brain Bank drawn as a map, so you can see what you know and how it all connects.
Mind maps
Think something through in an outline drawn as a map, then turn a branch into a todo or a project.
Todos
Critical, High, Medium or Low, with due dates and your own order.
Journal
Entries by day, found by date, category or search, and you can keep writing without a signal.
Pillars and projects
The areas of your life that matter most, the projects that serve them, and a few minutes' review each day.
Connect an AI
Let Claude, or another AI that supports connectors, read your brain, add to it and curate your Inbox.
Private by design
What you write is encrypted with your brain's own key, and every account signs in with two-step verification.
Questions
Who can read what I write?
Only you if you keep your brain private. It's encrypted before it's stored, so nobody running the site can read it, including its admins.
Can I share a brain?
Yes. Invite people to your brain, and switch between the brains you belong to from the dashboard.
What goes to an AI, and when?
AI gets an Inbox item only when you ask for it to be processed. An AI you connect reads only what you allowed it, and only when you ask it something.
Which AI does the curating?
The site's own AI, when you select Process, or any AI you've connected. You can have several curate the same item and keep the best version.
How do I join?
Brain Supply is invitation only for now. Open the link in your invitation and sign in with the address it was sent to.