1. Get the GUID of the simulator that you were using cd ~/Library/Developer/CoreSimulator/Devices This folder contain a file named device_set.plist. Open this file in a text editor Go to the section that lists all the simulators for the specific iOS version of interest e.g. com.apple.CoreSimulator.SimRuntime.iOS-14-5 In the dictionary () scroll to the simulator you were using e.g. com.apple.CoreSimulator.SimDeviceType.iPhone-12-Pro-Max The entry below that key is to GUID of the simulator.