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Runtimes are the OS images (iOS, tvOS, watchOS, visionOS) that simulators use. You need a runtime installed before you can create or boot simulators for that platform.

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Core Actions

ActionCommand
List installed runtimesflowdeck simulator runtime list
See downloadable runtimesflowdeck simulator runtime available
Install a runtimeflowdeck simulator runtime create iOS 18.1
Remove a runtimeflowdeck simulator runtime delete "iOS 17.2"
Prune simulators for a runtimeflowdeck simulator runtime prune "iOS 18.0"
See the Runtimes command reference for all flags and filters.