Make a Brewfile from what's installed

A Brewfile lists Homebrew taps, formulae, casks and App Store apps so brew bundle can install them all. Casky writes one for you from what's on your Mac.

Generate it

Choose File › Save This Mac as Setup. Casky lists every Homebrew formula you installed, every cask and every App Store app.
Remove anything you don't want to keep.
Choose Export Brewfile.

You can also tick items anywhere in Casky and export just those. The file looks like this:

# Generated by Casky (https://casky.app). Install with: brew bundle --file=<this file>

tap "charmbracelet/tap"

brew "git"
brew "node"
brew "charmbracelet/tap/mods"
brew "mas"

cask "ghostty"
cask "visual-studio-code"

mas "Xcode", id: 497799835

When the list has App Store apps, Casky adds brew "mas" so the mas lines work on a fresh Mac.

Install from it

brew bundle --file=Brewfile

Open a Brewfile someone shared

Choose File › Open Brewfile, or drag it onto Casky's window. Casky selects what it lists so you can review it before installing, and you can save it as a setup.

A Brewfile is Ruby, and brew bundle runs it as code. Casky only reads the plain tap, brew, cask and mas lines and never runs anything in the file; it shows you every line it left out.

More than a Brewfile

A Brewfile covers Homebrew and the App Store. A Casky setup also covers services, editor extensions, npm, pipx, uv and Cargo packages, dotfiles and Mac settings. See setting up a new Mac.