i never saw an emulator for iOS because it's not an open source OS so it's impossible to make an emulator of it
do they give access to the app store or how can i get the app itself?
I don't know if these emulators works, but if they are jailbroken you can just download the .ipa from a trusted website
No ios app work if it is not downloaded from their store.unless you root your iphone.
And there is no such ios emulator in the market and if they will be in future it will cost you alot.they are just malware so avoid it.
It's what I said, but if the app that the OP want is also available for Android, he can just download an Android emulator such as Andy or Nox and download the app from Play Store