ModelBrain plugs into the AI you already use and gives it a memory that lives on your own computer. You never open ModelBrain or learn anything new — you tell your assistant something once, and it's still there next week, in whichever assistant you use.
No account. Your vault stays on your computer by default — memories you share with an assistant are subject to that assistant's own data policies. You can read the memory file yourself, and delete anything in it whenever you want.
Not released yet. There's a working prototype, and every page here says plainly which parts aren't finished.
A single install command, nothing else to set up and no sign-up screen. It creates a vault on your computer and starts running quietly in the background.
One entry in your assistant's settings and it's connected. Anything that supports MCP — Claude, Cursor and a growing list of others — works the same way.
Carry on talking to your assistant — "remember this", "what did we decide on pricing?", "forget what I said about the venue". ModelBrain has no app of its own to open.
Local memory is free, permanently — not a trial, not a limited plan, not a tier with an asterisk. Device sync and managed backup are optional paid services, because they involve a computer ModelBrain runs, not one of yours.
No account, no card, no licence key, no expiry, and no cap on how much you remember. Commercial use included.
Any memory tool can list features. The question that matters is whether it brings back the right note, whether it points you at the note it actually used so you can check it, and whether it keeps doing that once you've got a thousand notes instead of ten.
So we built a test designed to catch our own mistakes — including the nasty cases, like two similar projects, a decision you changed your mind about, and a note you deleted. If it fails, the product doesn't ship. The method is published now; the scores come with the first release.
Your memories are files in a folder you own. There's no account, so there's no password, no profile, and nothing sitting on our servers to leak or be sold. Free isn't a trial — it's the whole thing, for one person, on their own machines.
If you later want your memories shared between your laptop and your desktop, or with your team, that's a paid add-on you switch on deliberately. It is never the default, and the part that would send anything anywhere doesn't exist yet.
*ModelBrain itself never sends it anywhere. Once your assistant has the memory, that's subject to your assistant's own policies.
Privacy in detail →"Forget that" does one of exactly two things, and both are written down. Ask it to forget a memory and it's gone from what gets recalled — it never quietly restores an older version behind the scenes. If you want an older version back, that's a separate, explicit "revert," never a side effect of forgetting. Ask it to forget a document you added, and the whole document goes, not a random paragraph of it.
Nothing you deleted comes back quietly. When you change your mind about something, the old version is kept as history you can look at on purpose, rather than competing with the new one behind your back.
A memory that lives inside one app is a memory you lose when you switch apps, and one nobody else can benefit from. ModelBrain sits outside the assistant, so the same memories are there whichever one you open — and the same vault can be shared with the people you work with.
Tell Claude something on Monday, ask Cursor about it on Thursday. Switch tools next year and the memory comes with you, because it was never inside the tool.
"What did we agree with this client?" gets the same answer for everyone, and a new colleague's assistant knows the history on day one. Private memories are excluded from sharing before it's even considered.
People who use an AI assistant most days for real work and are tired of re-explaining the same context every morning. People who keep notes, decisions and client details they'd rather not hand to a company's servers. And developers who want the protocol details — those are on a page of their own, not spread across this one.
It isn't released. The prototype works; the tested, installable version doesn't exist yet.
It reads text documents — Word, PDF, Markdown, plain text. Not spreadsheets, and not scanned pages, which have no text in them to read.
It won't notice on its own that two of your notes contradict each other. You tell it which one is current.
Sharing memories between devices or with a team is designed, not built.
The vault isn't encrypted by ModelBrain. Turn on your computer's own disk encryption — why, in plain terms.