Xcode Junk Simulator Runtimes
This folder stores Xcode CoreSimulator data such as simulator runtimes, devices, and related files used for iOS, watchOS, and tvOS development.
What is Xcode Junk Simulator Runtimes?
~/Library/Developer/CoreSimulator is a per-user Xcode development folder used by CoreSimulator, the Apple framework that powers Simulator. It typically contains installed simulator runtimes, virtual device data, logs, and support files for testing apps without physical devices. Developers commonly encounter it when managing disk usage because simulator runtimes and device data can grow large over time.
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Safety overview
Status: Mostly safe
This is generally non-essential for normal Mac use, but it is important for Xcode and Simulator workflows. Removing contents here can delete simulator devices, installed runtimes, app data inside simulators, and other testing environments. That can break or reset local development and testing until Xcode recreates or re-downloads what is needed.
Recommendation: Keep this folder if you use Xcode, Simulator, or any Apple platform development tools. If you no longer do development work, removing old CoreSimulator data is usually reasonable, but expect loss of simulator devices, simulator app data, and downloaded runtimes. If you still use Xcode, review its contents first and prefer removing unneeded runtimes or devices through developer tools when possible.
File path
~/Library/Developer/CoreSimulator
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