What Cachet cleans

What's in each category

Developer, package caches, app caches, old installers and logs, in plain English.

Developer: Xcode build data (DerivedData), device support files, SwiftUI previews, simulator caches and Xcode archives. Most of it Xcode rebuilds when needed. Archives don't come back, so they're marked Review.
Package caches: downloads kept by npm, Yarn, pip, Homebrew, Swift Package Manager, CocoaPods, Go, Playwright and Gradle. They download again when a project needs them.
App caches: temporary files apps keep in your Caches folder, such as Chrome's and Spotify's. Apps rebuild them as you use them.
Old installers: .dmg, .pkg, .iso and .xip files in Downloads that haven't changed in 90 days. They don't come back, so Cachet never ticks them for you.
Logs: log files apps write while they run.

Cachet only lists an item when it uses at least 1 MB. The full list of locations