Devices Simulator Data
~/Library/Developer/CoreSimulator/Devices stores per-device data for Apple Simulator, including apps, settings, and files used by Xcode test devices.
What is Devices Simulator Data?
~/Library/Developer/CoreSimulator/Devices is a developer-data folder used by Apple’s CoreSimulator framework and Xcode. It stores the individual simulated devices you use for iPhone, iPad, Apple Watch, Apple TV, and other supported simulator runtimes on macOS. Each device folder can contain installed test apps, app data, preferences, media, logs, and other state saved inside that virtual device. Developers encounter this folder when using Simulator, running apps from Xcode, testing across OS versions, or checking disk usage after repeated simulator use. The folder can grow large over time because every simulator device keeps its own separate data. Removing its contents resets or removes those simulated devices and can erase app data and test environments you may still need.
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Safety overview
Status: Use with caution
This folder is normal Apple developer data created by Xcode and Simulator. It is not required for everyday Mac use, but deleting it removes simulator devices and their stored app data, which can interrupt development, testing, screenshots, debugging, and reproducible test setups. If you still use Xcode, clean up unneeded simulators from Xcode or Simulator first instead of manually deleting random subfolders.
Recommendation: Keep this folder if you use Xcode, Simulator, or any Apple platform development workflow. If you no longer develop for Apple platforms, or you only need to free space and can recreate simulator devices later, you can remove old simulator data after closing Xcode and Simulator. Expect to lose saved simulator state and to wait for devices to be recreated when needed.
File path
~/Library/Developer/CoreSimulator/Devices
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