How to remove unused simulator runtimes

If you want to free some disk space by removing unused, unsupported or obsolete iOS simulator runtimes, you can first use the xcrun subcommand dedicated to managing simulators, simctl, to detect which runtime to delete:

xcrun simctl runtime list

The ouput will look like the following:

== Disk Images ==
-- iOS --
iOS 18.0 (22A3351) - 7976B5EC-52B8-4B7E-AF55-EC026BD24B51 (Ready)
iOS 17.5 (21F79) - 9591EEC3-598B-48AC-986D-53CEAB6FEBDB (Ready)
iOS 15.4 (19E240) - 5E844228-D8DF-4662-8D0E-9F3D1B898FAC (Ready)
iOS 16.4 (20E247) - 2671D0D4-24FF-4DAB-B148-C6C3547621E2 (Ready)
-- tvOS --
tvOS 18.0 (22J356) - F9F3744E-EDB7-4849-AFAB-21F103AA404A (Ready)
-- xrOS --
xrOS 2.0 (22N318) - A3675326-E2E5-4CEA-B0C9-68930F3E3317 (Ready)

Total Disk Images: 6 (32.1G)

Once you've decided which runtime has to go, you can use the delete <identifier> subcommand. For instance, when your app stops supporting iOS 15, you can remove its simulator runtime with :

xcrun simctl runtime delete 19E240

You can even use the all alias to delete all images :

xcrun simctl runtime delete all

or add an option to only delete images not used within the past <days> days :

xcrun simctl runtime delete --notUsedSinceDays 365

Finally, you can test your command before actually executing it, by appending --dry-run.

Thus, typing this command:

xcrun simctl runtime delete all --dry-run

would provide that output:

Would delete D: A3675326-E2E5-4CEA-B0C9-68930F3E3317 xrOS (2.0 - 22N318) (Ready)
Would delete B: D5E22916-F2E6-48C4-8FD3-6C8F07FC0646 iOS (15.4 - 19E240) (Ready)
Would delete D: 7976B5EC-52B8-4B7E-AF55-EC026BD24B51 iOS (18.0 - 22A3351) (Ready)
Would delete D: 9591EEC3-598B-48AC-986D-53CEAB6FEBDB iOS (17.5 - 21F79) (Ready)
Would delete D: 2671D0D4-24FF-4DAB-B148-C6C3547621E2 iOS (16.4 - 20E247) (Ready)
Would delete D: F9F3744E-EDB7-4849-AFAB-21F103AA404A tvOS (18.0 - 22J356) (Ready)