Xcode taking up too much space? What’s safe to delete

Why is Xcode taking up so much space?

The short answer

Xcode itself is about 12 GB. What grows is everything it keeps next to it: build folders for every project you've opened, a copy of iOS for every device you've plugged in, simulators for old iOS versions, and every archive you've made. After a year of development, 50 GB or more is normal.

What's safe to delete

Folder	Safe?
`~/Library/Developer/Xcode/DerivedData`	Yes. Rebuilt on the next build, which is slower once.
`~/Library/Developer/Xcode/iOS DeviceSupport`	Yes, for iOS versions you no longer test on. Re-copied when you plug that device in.
Unavailable simulators	Yes: `xcrun simctl delete unavailable`
Old simulator runtimes	Yes, if you don't test on that iOS version: `xcrun simctl runtime list`, then `xcrun simctl runtime delete <id>`
`~/Library/Developer/Xcode/Archives`	Careful. They hold the symbols you need to read crash reports from shipped versions.

Keep the archives of anything you've shipped. Without them, crash reports from that version can't be read.