What is an AI desktop app, and why is it different from the website?
November 2026
The short answer
An AI desktop app is the assistant installed on your computer instead of open in a browser tab. The difference is reach: with your permission, it can work with files and apps on your machine and carry out tasks, not just chat.
What it can do that the browser cannot
- Work with files and folders on your computer, not just ones you upload.
- Carry out multi-step tasks, like Claude’s Cowork or Microsoft’s Copilot Cowork: build the spreadsheet, draft the documents, file the results.
- Sit beside the apps you are using and help in them.
Why it needs a decision, not just an install
More reach means more to manage. An assistant that can open files on a laptop can open the wrong ones. Vendors know this: ChatGPT has added admin controls for features like Computer History on macOS, and most of them stay off until an admin switches them on.
Tasks that run on a desktop agent are also usually billed by use. Microsoft’s Cowork tasks run on Copilot Credits, so more hand-offs means a bigger bill.
What to decide before rolling it out
- Which app is your team’s main assistant, so people are not running three.
- Which folders and apps it may use, and which it may not.
- Which features stay off until you have tried them.
- Who installs and updates it, so it is not left to each person.