On the downside, you get hardware replication limits. It’s basically a framework that lets you create new instances of the iOS GUI on a Windows PC. Technically, Adobe AIR is not an emulator, it’s a developer tool that allows testers to get a feel for what an app will look like in an iOS ecosystem. On the other hand, Xamarin TestFlight is completely free to download and use.
However, on the downside, the iPhone emulator for PC is only compatible with iOS 8.0 and above. Now, it is owned by Apple itself, and it provides you lots of useful emulator features. It’s basically an iOS emulator for PC that runs very smoothly. Well, if you are an iOS app developer, you might find Xamarin TestFlight very helpful.