SimCleaner shows how much space simulators, runtimes, DerivedData and device support files take on your Mac, and removes the ones you no longer use. It's free, open source, and asks before it deletes anything.
Free · macOS 15.6 or later · No account, no tracking
At the bottom of every page, a single bar shows what simulators, runtimes, DerivedData, device support files, agent workspaces and simulator caches take, next to the space you have left. Click a colour and SimCleaner opens the page that cleans it.
Every cleanup in one sitting goes into the same total, so you can see what an afternoon of tidying bought you: 10 GB, then 15 GB with the next 5. An hour after your last cleanup, the count starts again.
Only what's gone from disk counts. Each item adds the bytes it held alone, so APFS clones aren't counted twice. Where APFS can't tell, SimCleaner uses the size on disk, and for a runtime the size Xcode reports. That's why the total says "about". A local Time Machine snapshot can also hang on to deleted files for a while.
Anything SimCleaner hasn't measured yet, couldn't read, or can't reach without your permission says so instead of pretending to be empty. A size it could only partly read shows as "at least" that much.
SimCleaner points out simulators you haven't opened in weeks, ones whose runtime is no longer on your Mac, and folders CoreSimulator forgot about. Each group says why it's there and how much removing it frees.
See which project each DerivedData folder belongs to, when Xcode last used it and how much it takes. Xcode's shared caches are listed on their own, so a 3 GB module cache stops being a mystery.
A cleaner you can't trust is worse than a full disk. These are the rules SimCleaner keeps.
Deleting, erasing and shutting down use simctl, the same CoreSimulator tool Xcode uses, so Xcode and Device Hub always agree with what's on disk. If simctl can't confirm a simulator is shut down, SimCleaner leaves it alone.
A running simulator is shut down first, or not touched at all when that isn't possible.
When APFS clones share files, you see the least and the most a cleanup frees, not one inflated number.
Drop a .app on the install sheet and SimCleaner puts it on every simulator you pick.
Open any simulator in Xcode 27's Device Hub, or reveal an app's Documents and caches in Finder.
SimCleaner Pro includes simcleaner. It follows the same rules as the app: commands that delete, erase or remove print what they would do and stop unless you pass --yes. Add --json to any listing for scripts and coding agents.
$ simcleaner storage WHAT ITEMS ON DISK FREES AT LEAST Simulators 12 18.82 GB 17.44 GB Leftover simulator folders 0 0 bytes 0 bytes Runtimes 1 8.07 GB 8.07 GB DerivedData 15 7.4 GB 6.68 GB Device support files 1 6.83 GB 6.83 GB Coding agent workspaces 29 119 KB 119 KB Simulator caches 0 0 bytes 0 bytes Free on this disk: 146.73 GB
Same code, same window. The difference is the App Sandbox: some jobs need to run outside it, so they live in SimCleaner Pro.
The one most people need. Sandboxed, updated by the App Store, macOS 15.6 or later.
For people who live in simulators. Notarized by Apple, updates itself, runs outside the sandbox, macOS 27 and Xcode 27.
simcleaner command line toolWhat each Xcode folder is, whether it's safe to delete, and how to do it by hand. Tested on macOS 27 with Xcode 27.
There's no account and no analytics, and SimCleaner sends nothing about your Mac anywhere. It looks at folders on your Mac and changes only what you confirm. The source is on GitHub under the MIT license, if you'd like to read it first.