Emulators are faster and cheaper to set up. Real devices are more reliable and undetectable. Here is when each is the right choice.
Emulators — Android Virtual Devices and iOS Simulators — run the mobile operating system in software on your computer. They are excellent for development and testing: fast to spin up, free, and controllable. They do not replicate real device hardware, sensors, network characteristics, or device fingerprints.
Physical iOS and Android devices provide real hardware characteristics: genuine device fingerprints, real sensor data, actual cellular network behaviour, and interaction patterns that are genuinely human-produced or indistinguishable from it. Modern apps can distinguish emulator environments from real hardware. Real devices eliminate this detection vector.
Use emulators for: development testing of your own apps; one-off automation tasks; and any scenario where you control the application being automated. Use real devices for: production automation running continuously; operations where detection is a risk; and any use case where real device behaviour is necessary.
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