Oh, it’s much worse than that. Once you add in Google’s platform (Android), you get even more “visions” such as the “pre-Google open-source variant” of an Android app (before Google’s fork of it to add “improvements”), and usually at least one crappy version installed by the phone carrier. And typically none of these can be removed, all part of the ROM. I remember seeing at least THREE variants of several common apps when using Android. I couldn’t believe it was so unfocused.