Cleaning Up Xcode Simulator Runtimes

I have a MacBook Air M3 with 256GB of storage. It is not a lot. I use it for my Python projects and iOS projects, so Xcode and all its baggage are a permanent fixture. Recently I noticed my disk was almost full, and my System Data was over 100GB. I had no idea what was in there or how to clean it. I tried the usual — clearing caches, emptying the bin — and nothing moved the needle. I ended up trying DaisyDisk, which visualises your disk as a sunburst chart so you can see exactly what is taking up space. It made it very easy to find the offenders. I cleaned over 50GB in one session and bought the app straight after. DaisyDisk also surfaced data left behind by apps I had long deleted — 1GB from Zed Editor, 3GB from the Prime Video app. Apps don’t always clean up after themselves when you remove them. One of the biggest culprits was Xcode simulator runtimes — large disk images that pile up silently as you install new iOS versions and never remove the old ones. I googled the specific…