It depends. The Xcode app is takes only ~6 GB on disk (it's compressed, and the next version will use even less disk space), and it contains the macOS SDK. The

It depends. The Xcode app is takes only ~6 GB on disk (it's compressed, and the next version will use even less disk space), and it contains the macOS SDK. The others SDK are optional, so it won't automatically install iOS simulators anymore.