# Microsoft Office add-in development

I built PageProof's Office add-in, which brings proofing into Microsoft Office and is listed on Microsoft Marketplace. I can build a taskpane add-in that puts your product inside the documents your users already work in.

## Shipped

• PageProof for Microsoft Office

  Powerful online proofing for Microsoft Office

## What I handle

• Taskpane UI in React and TypeScript
• Reading and inserting document content with Office.js
• Signing in to your service from inside Office
• Support across Office on Windows, Mac and the web
• Microsoft Marketplace submission and validation

## How it works

1. A call to understand the workflow you want inside the host app.
2. A written scope with a fixed quote and timeline.
3. Early builds you can try, with regular check-ins.
4. Store submission, then handover of the code and documentation.

## Questions

Can one add-in cover Word, Excel and PowerPoint?

Often, yes. A single add-in can run in several Office apps, with app-specific code where their APIs differ.

Do add-ins work in Office on the web?

Yes. Office.js add-ins run in Office on Windows, Mac and the web.