Brainstack Self-hosted · team memory for AI

Your AI assistant finally knows what your team knows.

Brainstack reads your team's email and files, pulls out the facts that matter, and lets your AI assistant answer with them, showing exactly where each answer came from.

It runs on a computer your company controls. What it learns stays with you.

Illustration: pages of email and files from a made-up snack company come together into one memory, kept inside your company.

Works with the tools you already use

  • Gmail mail
  • Google Drive files
  • Outlook mail
  • OneDrive files
  • Claude assistant
  • ChatGPT assistant
  • Microsoft 365 Copilot assistant

Ask things like

  • What did the buyer agree to for the spring promo?
  • How does Sam build the monthly Northgate scorecard?
  • When does the co-packer start the new 12 oz run?
  • What's our process for a new item setup?
  • What's the case pack for the 8 oz bags?
  • Who's our contact at Brightline Co-Pack?
  • What's coming up on the Northgate account?
  • What did we decide in last quarter's pricing review?
  • When is final artwork due?
  • What went wrong with last year's holiday launch?
  • How does Sam usually format the weekly sales recap?
  • What did we promise Northgate for Q3?

How it works

From your inbox to your answer.

Brainstack reads the email, files and AI chats you choose, keeps the facts that matter with the exact words they came from, and gives them to the AI assistant your team already uses.

Read and save

Brainstack reads your email, files and AI chats, and saves what matters.

Connect Gmail or Outlook, Google Drive or OneDrive, and the AI chats your team has in Claude, ChatGPT or Copilot. Then pick the labels and folders Brainstack may read.

Example email from Jenna Carter at Northgate Grocers, March 3, subject “Spring promo: confirmed”. It says: Hi Sam, thanks for the call. We're confirmed for the spring promo from April 7 to April 20 at $1 off the 8 oz bags. Endcap placement is in all 40 stores, and we need final artwork by March 17. Brainstack saved 3 facts to your company's Brainstack, each with the exact words it came from: the spring promo runs April 7 to April 20 at $1 off the 8 oz bags; endcap placement is in all 40 stores; final artwork is due March 17. Only people who can open the original email can see these facts.

Example email from Marcus Bell at Brightline Co-Pack, March 12, subject “12 oz run schedule”. It says: Hi Sam, we've locked line time for the new 12 oz run. Production starts the week of May 5, and the first pallets ship to your warehouse by May 16. Let me know if the label art changes. Brainstack saved 2 facts to your company's Brainstack, each with the exact words they came from: production of the new 12 oz run starts the week of May 5; the first pallets ship to your warehouse by May 16. Only people who can open the original email can see these facts.

Example email from Morgan at Harvest Lane Snacks to Sam, Jordan and Jenna Carter at Northgate Grocers, June 18, subject “Q3 line review: final deck”, with the deck attached. It says: Hi all, attached is the final Q3 line review deck for Northgate. We're going with a 3% list increase instead of 5%, and the Chili Lime launch moves to August 4. Jenna, let us know if your team has questions. Brainstack saved 2 facts to your company's Brainstack, each with the exact words they came from: a 3% list increase instead of 5%; the Chili Lime launch moves to August 4. Everyone on this thread who connects their mailbox can see these facts, each from their own copy of the email, and nobody else can.

Example email from Marcus Bell at Brightline Co-Pack to Sam, copying Morgan, June 24, subject “Chili Lime run: new ship date”. It says: Hi Sam, bad news on the Chili Lime run. A film supplier delay means we can't ship until August 11, a week later than planned. I'll confirm the new truck dates by Friday. Brainstack saved 1 fact to your company's Brainstack, with the exact words it came from: we can't ship until August 11. As it saved the fact, Brainstack flagged that it conflicts with the Q3 line review deck, which says the Chili Lime launch is August 4. Only people who can open the original email can see this fact.

Example document, “Northgate spring promo plan”, in Google Docs or Word. Jenna Carter edits one line, changing endcap displays from 40 to 52 Northgate stores, which makes version 4. Brainstack notices the edit and updates the saved fact in your company's Brainstack: endcap displays in 52 Northgate stores, as of version 4, with the exact words from the doc. Only people who can open the original document can see this fact.

Example spreadsheet in Google Sheets or Excel, “Northgate item spec sheet”, with one column for each item, Sea Salt 8 oz and Chili Lime 8 oz. For both items, case pack: 12 per case; lead time: 6 weeks from PO; shelf life: 180 days. Brainstack saved 2 facts to your company's Brainstack, each with the exact words they came from: 12 per case; 6 weeks from PO. Only people who can open the original spreadsheet can see these facts.

Example deck in Google Slides or PowerPoint, “Q3 line review: Northgate”. Slide 3, “Pricing recommendation”, has three bullets: 3% list increase (not 5%); Chili Lime launch: August 4; Hold Sea Salt pricing. Brainstack saved 2 facts to your company's Brainstack, each with the exact words they came from: 3% list increase (not 5%); Chili Lime launch: August 4. Only people who can open the original file can see these facts.

Example PDF on a shared drive such as Google Drive or SharePoint, “Northgate trade agreement”. Page 3, section 4, “Shipping and deductions”, lists four clauses: 4.1, deliveries arrive on the booked appointment date; 4.2, late-shipment fee: 3% of invoice value per week late; 4.3, disputes are filed within 30 days of payment; 4.4, deductions contact: deductions@northgate-grocers.test. Brainstack saved 2 facts to your company's Brainstack, each with the exact words they came from: late-shipment fee: 3% of invoice value per week late; deductions contact: deductions@northgate-grocers.test. Only people who can open the original file can see these facts.

Example chat in Claude, where Morgan, the marketing director, builds the Q3 pricing deck. Morgan writes: Help me build the Q3 pricing deck for Northgate. It's for Jenna's quarterly review, so lead with velocity, not margin. Northgate pushed back hard on 5% in May, so we call out the endcap risk on slide 2. Claude answers: Then 3% is the safer ask: it keeps you whole on cost without risking the endcaps. I'd hold 5% as the fallback for 2026. Brainstack saved 3 things to your company's Brainstack, each with the exact words it came from. Two are from Morgan: lead with velocity, not margin; we call out the endcap risk on slide 2. One is from the AI: 3% is the safer ask. Only Morgan, the person who had this chat, can see them.

Example chat in ChatGPT, where Sam, the sales lead, writes the weekly sales recap. Sam writes: Write this week's Northgate recap the way our team always does: sell-through first, then promo dates, then open issues. Northgate only cares about the 8 oz bags this quarter, so leave the 12 oz out until August 4. ChatGPT answers: Got it. Sell-through first, 8 oz only, and I'll add a one-line heads-up on the August 4 launch. Brainstack saved 3 things to your company's Brainstack, each with the exact words it came from. Two are from Sam: sell-through first, then promo dates, then open issues; Northgate only cares about the 8 oz bags this quarter. One is from the AI: add a one-line heads-up on the August 4 launch. Only Sam, the person who had this chat, can see them.

Example chat in Microsoft 365 Copilot, where Morgan, the marketing director, drafts the note to the client. Morgan writes: Draft a note to Jenna on why we're going with 3%. Keep it short and warm. Jenna hates long emails, and don't mention 5% at all. Copilot drafts: Hi Jenna, thanks for the candid feedback on pricing. We're going with 3% this quarter to protect your endcap velocity, and we'll revisit in 2026. Brainstack saved 3 things to your company's Brainstack, each with the exact words it came from. Two are from Morgan: Jenna hates long emails; don't mention 5% at all. One is from the AI: to protect your endcap velocity. Only Morgan, the person who had this chat, can see them.

Example with made-up data. Brainstack never shows a fact to anyone who can't open the original email, file or chat.

  • If the exact words can't be found in the original, the fact isn't kept.
  • A second check makes sure those words really say what the fact says.
  • It counts how many different people said it, so ten copies of one email still count as one.

Ask

Ask in the assistant you already use.

Your team asks the way they always do, and the assistant answers with your team's facts and shows where each one came from.

ClaudeBrainstack connected

Jordan, new brand manager

Sam's out today and Jenna wants the monthly Northgate scorecard by 3pm. How did Sam build it last month?

Here's how Sam built May's scorecard:

  1. Sell-through comes from Northgate's POS export.

    Northgate POS export (CSV), May 31
  2. Promo weeks come from the promo plan, so lifts match the right dates.

    Northgate spring promo plan
  3. Only the 8 oz bags. Jenna asked Sam to leave the new 12 oz out.

    Email from Jenna, May 28
  4. Jenna always asks why week 3 dipped. Sam's answer: the endcap reset timing.

    Scorecard email to Jenna, Jun 3

Want me to start June's the same way?

Ask a follow-up…
ClaudeBrainstack connected

Jordan, new brand manager

I'm meeting Jenna at Northgate tomorrow. What do I need to know?

Here's your brief for Jenna:

Commitments

We promised the 3% list increase holds through Q3.

Email to Jenna, Jun 18

Chili Lime launches August 4 in the deck, but Marcus's Jun 24 email says August 11. Confirm before you meet.

Sources disagreeQ3 line review deckEmail from Marcus, Jun 24
Open issue

Invoice #4471 was short-paid $1,240. The dispute was sent Jun 20.

Email from Morgan, Jun 20
What Jenna cares about

Jenna hates long emails and always asks about week-3 dips.

Email from Jenna, May 28
Ask a follow-up…
ChatGPTBrainstack connected

Morgan, marketing director

Jenna's asking why we went with 3% instead of 5%. Remind me how we landed on it?

You chose to lead with velocity, not margin, because Northgate pushed back on 5% in May. Your deck makes the case that 3% protects endcap velocity, and you sent it to Jenna and the team on Jun 18.

Your Claude chatOnly youQ3 line review deckYour email to Jenna and the team, Jun 18
Ask a follow-up…
ChatGPTBrainstack connected

Sam, sales lead

When does Chili Lime launch at Northgate?

Sources disagree

Your sources disagree. The Q3 line review deck says August 4, but Marcus's email from Jun 24 says the co-packer can't ship until August 11. Worth confirming with Marcus before you tell Jenna.

Q3 line review deck, Jun 18says August 4Email from Marcus (Brightline Co-Pack), Jun 24says August 11
Ask a follow-up…
Microsoft 365 CopilotBrainstack connected

Jordan, new brand manager

Draft this week's Northgate recap the way Sam usually does it.

Sam's recaps go sell-through first, then promo dates, then open issues, and this quarter they only cover the 8 oz bags. Here's a draft:

  • Sell-through, 8 oz: [this week's numbers]
  • Promo dates: Chili Lime launch August 4, but Marcus now says August 11 (confirming)
  • Open issues: invoice #4471 dispute sent Jun 20
Weekly recap from Sam, Jun 13Email from Morgan, Jun 18Email from Morgan, Jun 20
Message Copilot…
Microsoft 365 CopilotBrainstack connected

Morgan, marketing director

What changed on the Northgate account this week?

Three things changed on Northgate this week:

  • Endcap displays: 40superseded 52 Northgate stores

    Northgate spring promo plan, version 4
  • Chili Lime launch: still August 4 in the deck, but Marcus now says August 11 Sources disagree

    Email from Marcus, Jun 24
  • Invoice #4471 dispute: not sentsuperseded sent

    Email from Morgan, Jun 20
Message Copilot…
Microsoft 365 CopilotBrainstack connected

Jordan, new brand manager

Northgate sent their vendor questionnaire. Fill in what you can from what we've told them before.

Northgate vendor questionnaire4 of 6 filled in

Lead time for new items?
6 weeks from PONorthgate item spec sheet (Sheets or Excel)
Case pack, 8 oz bags?
12 per caseNorthgate item spec sheet (Sheets or Excel)
Promo funding for Q3?
$1 off, Apr 7 to Apr 20 already run; Q3 TBDEmail from Jenna, Mar 3
Contact for deductions?
MorganEmail from Morgan, Jun 20

2 questions left for you: the new UPC and the food safety certificate.

Message Copilot…

Example with made-up data. Each answer uses only the email and files the person asking can open, plus their own AI chats.

Works for your AI agents too: they get the same team memory through the same connection. Brainstack connects through MCP, the open standard for connecting AI assistants to tools.

Turn on what you want

The more you connect, the smarter it gets.

Your IT team chooses what Brainstack can read: email, shared drives, AI chats, or all of them. Each one you turn on helps it connect the dots.

Example. In Brainstack's IT settings, three switches turn on one at a time: Email (Gmail or Outlook), Drive (shared drives such as Google Drive or SharePoint) and AI chats (Claude, ChatGPT or Microsoft 365 Copilot). With email on, Brainstack has the June 18 email in which Morgan sent the final Q3 line review deck to the team and to Jenna Carter at Northgate. With Drive on, it adds the deck itself, which says 3% protects endcap velocity, and links it to that email. With AI chats on, it adds Morgan's Claude chat, where Morgan explained why 3%: lead with velocity, and call out the endcap risk. It links the chat to the deck and the email. Morgan then asks: Why did we go with 3% for Northgate? The answer is stitched from all three: lead with velocity, because Northgate pushed back on 5%, from Morgan's Claude chat, which only Morgan can see; 3% protects endcap velocity, from the deck; and it was sent to Jenna on June 18, from the email.

Every decision stays tied to the reasoning behind it, the file it went into, and the email it went out in.

AI chats need Claude Enterprise, ChatGPT Enterprise or Microsoft 365 Copilot.

Example with made-up data. Morgan asks here, so the answer can use Morgan's own chat. Anyone else gets only the parts from the email and files they can open.

Private by design

Your own AI.
Inside your company.

Brainstack comes with its own AI, and it runs on a computer your company owns. Your email and files are read right there and never sent to an outside AI company to be read.

Your email and files flow into Brainstack, inside the boundary of your company. Brainstack reads them with its own AI and keeps the facts there. The path to outside AI companies is locked. An encrypted backup sits outside, with its key kept apart. Each person on your team sees only what they could already open, and a removed person loses access. Email& files YOUR COMPANY Outside AIcompanies BRAINSTACK YOUR OWN AI · READING Your team Encryptedbackup Key keptapart
  • Your data stays yoursWhat it learns is stored on that same computer, in your company's hands.
  • Your own AIBrainstack's AI runs on your company's computer, in your office or your own cloud account.
  • Locked backupsBackups are encrypted, and the keys to open them are kept somewhere else.
  • Same access as todayPeople only see what they could already open. Remove someone and their access ends everywhere at once.

When someone asks Claude, ChatGPT or Copilot a question, Brainstack hands over only the facts that answer it, and only ones that person is allowed to see.

For your IT person

Your IT person sets it up once.

They set it up on a Linux machine your company controls: a computer in your office, or a virtual machine in your company's own cloud account (such as AWS, Azure or Google Cloud). They pick which sources Brainstack may read, and a guided wizard walks them through connecting mail, cloud drives and AI chats. After that, your team just signs in with the work account they already use.

Send them the page for IT
Setup wizard5 of 5 done
  1. Claim your site01
  2. Invite your team02
  3. Connect mail03
  4. Connect cloud drives04
  5. Connect AI chatsvia each vendor's enterprise API05

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?
Brainstack runs on a computer your company controls, and the AI that reads your email and files runs there too, so your text isn't sent to an outside AI company. Backups are encrypted. Each person only sees what they could already open in the original app.
Do I need IT help to set it up?
Yes, once. Your IT person or IT provider sets it up on a Linux machine your company controls: a computer in your office, or a virtual machine in your company's own cloud account (such as AWS, Azure or Google Cloud). It needs enough memory and processing power to run its own AI, but no special graphics card. They point a web address at it and connect your company's sign-in, such as Google or Microsoft, and a guided wizard walks them through the rest. After that, your team just signs in. Here's the page for your IT person.
Which apps does it work with?
Gmail, Google Drive, Outlook and OneDrive. You choose which labels and folders it can read. In Google Drive and OneDrive it reads Google Docs, Sheets and Slides, Word, Excel, PowerPoint and PDF files, plus plain text and CSV. Everyone signs in with the work account they already use.
Which AI assistants can use it?
Claude, ChatGPT and Microsoft 365 Copilot all work with Brainstack. Your IT team connects it once, and everyone signs in with their usual work account. Your team can also look facts up directly on Brainstack's own Facts page.
Can it learn from our AI chats?
Yes, if your company is on Claude Enterprise, ChatGPT Enterprise or Edu, or Microsoft 365 Copilot. Your IT team turns it on for each one. Each chat's reasoning stays visible only to the person who had it.
Will it change my email or files?
No. Brainstack only reads them. It never edits, moves or sends anything in your inbox or folders.
What happens when someone leaves?
Remove them once and their access ends everywhere at the same moment, including 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 computer your company controls
  • The AI that reads your files runs there too
  • Every fact shows the words it came from

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