BCD

Mac apps › S

Use SizeUp on your Mac from ChatGPT or Claude

Utility to resize and position application windows. With BCD, ChatGPT, Claude and other AI apps can open SizeUp on your Mac, read its window and press buttons or type, from your phone or another computer.

Works on

About SizeUp

Version
1.7.4
Installs (last 365 days)
250 · #1,654 among Homebrew apps
Updates
Updates itself
Homepage
www.irradiatedsoftware.com/sizeup
Install
brew install --cask sizeup

Try asking

“Open SizeUp and tell me what is on its screen”
“Install SizeUp with Homebrew”
“Quit SizeUp and update it to the latest version”

Questions

Can ChatGPT control SizeUp?
On a Mac with BCD, yes, through the app's window: ChatGPT can open SizeUp, read the buttons and text it shows, press buttons, type and pick menu items. How far that goes depends on how much of its window SizeUp exposes to macOS accessibility.

Does this work on Windows?
No. BCD controls app windows only on a Mac. On Windows and Linux it works with files and commands.

Is it safe?
A new computer starts read-only. Controlling the screen and apps is turned on per computer, and macOS asks once before BCD may control apps.

Try it on your computer

BCD connects ChatGPT, Claude and other AI apps to your own Mac, Windows or Linux computer. One computer is free, with 20,000 tool calls a month and no card.

Program data from Homebrew, updated 2026-11-11. Installs are Homebrew's installs on request over the last 365 days.