My understanding is that it's tied to your Apple ID and the whole thing is free (up to certain limits). So if a user has your app, they have an Apple ID and the

My understanding is that it's tied to your Apple ID and the whole thing is free (up to certain limits). So if a user has your app, they have an Apple ID and they have some iCloud storage. However, it is likely that, as a user, you have to allow an app to use it or not. What I meant, basically, is that you can prompt the user to authorize iCloud, but the user will not have to be taught what it is or to create an account for it. They should have it.