Brainstack Self-hosted · team memory for AI

Save what your AI figured out. Share it with your team.

Just built a deck, a report or a client email with your AI? Say “save this to the brain.” The context, the sources and how you did it are kept on your company's server, private until you share them.

Kept on your server. Shared only when you say so.

Get in touch See how it works

Illustration: notes saved from Claude, ChatGPT and Copilot at a made-up snack company come together in one memory, kept inside the company. Each note stays private, or goes only to the people its owner shared it with.

Works in the assistant you already use

  • Claude assistant
  • ChatGPT assistant
  • Microsoft 365 Copilot assistant
  • Any MCP client open standard

Ask for what your team saved

  • How does Sam build the Northgate scorecard?
  • Why 3% for Northgate?
  • What did we promise Jenna for Q3?
  • How did we build the Q3 line review deck?
  • What tone works best with Jenna?
  • Which sources went into June's scorecard?
  • What's still open with Northgate?
  • Why do we explain the week-3 dip first?

How it works

From your chat to your team.

Finish a piece of work with your AI, then save how you did it. The note stays private until you share it with a person or a team, and next month anyone you shared it with can ask their own assistant for it.

Save and share

Finished something with your AI? Save it, then share it.

Ask your assistant to save the work: it writes a short note with what you made, the sources, how you built it and the key decisions. The note is private until you share it, and the assistant always shows who will be able to read it and waits for your yes.

Example with made-up data. In Claude, Morgan, the marketing director, has just finished the Northgate Q3 line review, a 12-slide deck. Claude's reply shows that it worked through 14 steps and used 3 sources: 4 emails with Jenna, the Q2 line review deck and the Northgate POS export. Morgan then says: Save this to the brain. Claude replies: Saved to Brainstack, just for you. Here's the note. What we made: a 12-slide Q3 line review for Northgate. Sources: the Q2 deck, Jenna's emails and the POS export. How we built it: lead with endcap velocity, not margin. Decisions: 3% not 5%, because 5% risks the endcap slot. At first only Morgan can see the note. Morgan then says: Share it with Jordan. Before anything is shared, Claude shows a review: Jordan will be able to read this note. Confirm? Morgan says yes, and the note's audience changes from Only you to You and Jordan. Claude replies: Shared. Jordan can read it now.

Example with made-up data. In ChatGPT, Sam, the sales lead, has just finished June's Northgate scorecard, a 3-page report. ChatGPT's reply shows that it worked through 9 steps and used 3 sources: the Northgate POS export, the Q3 promo plan and May's scorecard. Sam then says: Save this to the brain. ChatGPT replies: Saved to Brainstack, just for you. Here's the note. What we made: the monthly Northgate scorecard, for June. Sources: the POS export, the promo plan and last month's scorecard. How we built it: pull POS on Mondays; match promo weeks to the promo plan; 8 oz only. Decisions: explain the week-3 dip up front, because Jenna always asks. At first only Sam can see the note. Sam then says: Share it with the Northgate team. Before anything is shared, ChatGPT shows a review: 4 people on the Northgate team will be able to read this note. Confirm? Sam says yes, and the note's audience changes from Only you to You and the Northgate team (4 people). ChatGPT replies: Shared. The Northgate team can read it now.

Example with made-up data. In Microsoft 365 Copilot, Jordan, the new brand manager, has just finished an email to Jenna Carter at Northgate recapping the Q3 commitments. Copilot's reply shows that it worked through 6 steps and used 3 sources: 4 emails with Jenna, call notes from Jun 17 and the open invoices. Jordan then says: Save this to the brain. Copilot replies: Saved to Brainstack, just for you. Here's the note. What we made: a recap email to Jenna; 3% holds through Q3, and Chili Lime launches Aug 4. Sources: Jenna's emails, the Jun 17 call notes and the open invoices. How we built it: short, numbers first, because that is the tone that works with Jenna. Decisions: invoice #4471 stays open, because the $1,240 short-pay isn't settled. Jordan does not share it. Copilot adds: Kept private. Only you can see it.

  • It never guesses who you mean. If two people share a name, it asks.
  • Share with a person, your own group, or a company team your admin set up.

Example with made-up data. Your assistant does the work with its own tools; Brainstack keeps only the note you ask it to save.

Ask

Next month, anyone you shared with can ask their own assistant.

Your team asks the way they always do. Brainstack finds the notes that person may see and passes them to their assistant, which answers with the context and the method and shows which note each part came from.

ClaudeBrainstack connected

Jordan, new brand manager

Sam's out. Build this month's Northgate scorecard the way Sam does it.
Searching Brainstack…1 note found

Here's how Sam builds it, step by step:

  1. Pull POS on Mondays.

    Sam's note · Northgate scorecardNorthgate team

  2. Match promo weeks to the promo plan.

    Sam's note · Northgate scorecardNorthgate team

  3. 8 oz only.

    Sam's note · Northgate scorecardNorthgate team

  4. Explain the week-3 dip up front: Jenna always asks.

    Sam's note · Northgate scorecardNorthgate team

Want me to start July's scorecard the same way?

Ask a follow-up…
ChatGPTBrainstack connected

Morgan, marketing director

Why did we go with 3% for Northgate?
Searching Brainstack…1 note found

When you built the Q3 line review, you chose to lead with endcap velocity, not margin. You went with 3% instead of 5% because 5% risks the endcap slot.

Your note · Northgate Q3 line reviewYou and Jordan
Ask a follow-up…
Microsoft 365 CopilotBrainstack connected

Jordan, new brand manager

Prep me for my call with Jenna tomorrow.
Searching Brainstack…2 notes found

Here's your brief for Jenna:

Commitments

The 3% increase holds through Q3, and Chili Lime launches August 4.

Morgan's note · Northgate Q3 commitmentsNorthgate team
Tone

Keep it short, numbers first. That's what works with Jenna.

Your note · Q3 recap to JennaOnly you
Open item

Invoice #4471 is still open: $1,240 short-paid.

Your note · Q3 recap to JennaOnly you
Message Copilot…

Example with made-up data. Each answer uses only notes the person asking can see: their own, and ones shared with them.

Any MCP client can connect the same way, with the same per-person access. MCP is the open standard for connecting AI assistants to tools.

My notes

See everything you've saved, and undo any share.

Every note you've saved is listed with who can read it, in plain language. Stop sharing with one person or everyone, or delete the note, whenever you like.

Example with made-up data. Sam's My notes page lists Sam's own notes, newest first, each with who can see it. Northgate monthly scorecard, saved Jun 30: You and the 'Northgate' team (4 people). Northgate contacts, saved Jun 24: You and the 'Northgate' team (4 people). Q3 pricing call prep, saved Jun 12: You and your group 'Q3 pricing' (2 people). New item setup steps, saved May 20: Only you. Each shared note has Stop sharing, with a choice of who to stop sharing with, and every note has Delete. Beside the list, My groups shows Sam's group Q3 pricing: Jordan and Morgan, 2 people, with 1 note shared through it, and an Add people button.

Example with made-up data. Stop sharing takes a note back from the people you choose; nobody else's notes are affected.

Private by design

Your notes.
On your server.

Everything your team saves is stored on your server, in your company's hands. Brainstack runs no AI model of its own. It keeps the notes, searches them, and makes sure each person only ever gets the notes they may see.

A note saved in an AI assistant travels over a locked line into Brainstack, inside your company, and is stored as private. When someone asks, only the notes that person may see go back out to their assistant; another person's private note stays put. An encrypted backup sits outside, with its key kept apart. Each person on your team reaches only their notes, and a removed person loses access. Key keptapart YOUR COMPANY Assistants only notes thisperson may see BRAINSTACK SAVED · PRIVATE Your team Encryptedbackup
  • Stored on your serverEvery note is kept in Brainstack's own database, on a machine your company controls, in your office or your own cloud account.
  • Private until you shareA new note is visible only to the person who saved it. When someone asks, their assistant gets only the notes they may see.
  • Locked backupsBackups are encrypted, and the keys to open them are kept somewhere else.
  • Leave and access endsRemove someone once and they lose access to every note at the same moment, in every assistant they connected.

When someone asks Claude, ChatGPT or Copilot a question, Brainstack passes their assistant only the notes that person may see, so it can answer. That is like pasting those notes into the chat, under your company's existing agreement with that AI company.

For your IT person

Your IT person sets it up in an afternoon.

It runs on a small Linux server or cloud VM — no special hardware, and no AI model to run. They point a web address at it, connect your company's sign-in, such as Google or Microsoft, and a short wizard does the rest. After that, your team signs in with the work account they already use.

Send them the page for IT
Setup wizard3 of 3 done
  1. Claim your site01
  2. Invite your team02
  3. Add Brainstack to your assistantsor IT pushes it to everyone03

Independently security-tested before every release.See how we test it

Questions

Plain answers.

Something else on your mind? Ask us when you get in touch.

Is my data safe?
Your notes are stored on your server, a machine your company controls, and backups are encrypted. A note is visible only to the person who saved it until they share it, and each person's assistant only ever gets the notes that person may see.
Does Brainstack read our email or files?
No. It only keeps what people choose to save. Your assistant may use its own tools to look at email or files while it works; Brainstack only keeps the note you ask it to save.
Who can see what I save?
Only you, until you share it. Ask your assistant to share a note with a person, your own group or a company team; it shows exactly who will be able to read it and waits for your yes. You can update a note later through your assistant, and stop sharing or delete it any time on your My notes page.
Does the AI company see my notes?
Saving happens inside your AI chat, so your assistant sees the note as it writes it. When someone asks a question, Brainstack passes the notes they may see to their assistant so it can answer. That is like pasting them into the chat, under your company's existing agreement with that AI company. Brainstack itself runs no AI model.
Which AI assistants work with it?
Claude, ChatGPT and Copilot can all connect. Some plans need your admin to turn on custom connectors. Any other assistant that supports MCP, the open standard for connecting AI assistants to tools, can connect too.
Do I need IT help to set it up?
Yes, once. Your IT person or IT provider sets it up on a small Linux machine or cloud VM your company controls, with no special hardware and no AI model to run. They point a web address at it, connect your company's sign-in, such as Google or Microsoft, and run a short setup wizard. After that, your team signs in and adds Brainstack to their assistant, or IT adds it for everyone. Here's the page for your IT person.
What happens when someone leaves?
Remove them once and their access to every note ends at the same moment, including in any AI assistant they had connected.
What happens after I reach out?
We set up a short call to learn how your team works. If it's a fit, your IT person sets Brainstack up with our help. We'll talk about pricing on that call.

Get in touch

Let's talk about your team.

Tell us a little about your team and we'll reach out to set up a conversation.

  • Runs on a server your company controls
  • Private until you share
  • Works in the assistant you already use

Sending opens your own email app. Prefer to write yourself? Email liam@northstar-strat.com