Syntax brAIn · Office add-ins

The AI assistant in Excel and PowerPoint.

A chat in the task pane that reads the open workbook or presentation and changes it with your approval. Installed in two minutes, no admin required.

Excel brAIn Syntax Excel brAIn

Reads, analyses and builds tables: formulas, formatting, pivots, charts, data cleaning – right inside the workbook.

“Build me a dashboard from Table1”
“Explain the formula in D12”
Paste a screenshot → rebuild the table

Download installer

Manifest only (for Excel on the web): manifest.xml

PowerPoint brAIn Syntax PowerPoint brAIn

Creates and reworks slides: new slides in the deck's layout, tighter copy, tables and shapes, reordering and layout changes.

“Create an agenda slide with five points”
Select a slide → “Improve this slide”
“Turn this text into an 8-slide deck”

Download installer

Manifest only (for PowerPoint on the web): manifest.xml

How it works

1
Download and unzip the installer.
The button above, on the add-in's card. Then right-click the zip → Extract All — do not run the .cmd from inside the zip.
2
Double-click Install-Windows.cmd.
No admin required. The script only places the manifest file where Office looks for add-ins and starts Excel or PowerPoint. If the app is already running, close it once and reopen it.
3
Ribbon Home → group brAIn → Open brAIn.
Button missing? Home → Add-ins → Developer Add-ins. Then enter your API key (see below).

Remove: Uninstall-Windows.cmd from the same zip.

1
Open Terminal.
⌘ + Space, type “Terminal”, Enter. No download, no zip needed.
2
Paste one line and run it with Enter.

Excel

PowerPoint

The script downloads the manifest and puts it into the add-in folder of Excel or PowerPoint. No admin, no password. Please don't start it as a file by double-clicking: macOS blocks downloaded scripts (“Not opened”); in Terminal they run without prompts.
3
Quit Excel or PowerPoint completely (⌘Q) and reopen it.
Ribbon Home → group brAIn → Open brAIn. Button missing? Insert → Add-ins → My Add-ins → Developer Add-ins. Then enter your API key (see below).

Remove: the same line with --uninstall at the end. Offline: run bash install-mac.sh from the unzipped installer.

1
Download the add-in's manifest.xml.
Link under the installer button (also included in the zip).
2
excel.office.com or powerpoint.office.com → Home → Add-ins → Upload My Add-in.
Pick the downloaded file.
3
Group brAIn → Open brAIn, enter your API key.
If “Upload My Add-in” is missing, sideloading is disabled in your tenant – an M365 admin deploys it instead (see below).

Sign in with your GenAI Studio key

On first open the task pane asks for an access key. In GenAI Studio go to Settings → API Keys, create a personal key and paste it into the task pane's gear menu.

The key stays local in your Office and is only used to call GenAI Studio on your behalf. Excel and PowerPoint remember the key separately.

For M365 admins

Centralized deployment via admin.microsoft.com → Settings → Integrated apps → Upload custom apps with these manifest URLs:

Excel:
PowerPoint: