From the existing apps of the apple store, which would be the most impossible to make for other phone than iPhone? (maybe because of processing performance, touchscreen performance, multi-touch, or whatever).
closed as not a real question by Kyle Cronin♦ Feb 16 '11 at 23:03
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.
The iPhone has nothing unique in terms of hardware. Neither processor (speed, type), touchscreen (type, size, sensitivity, interactions), geo-location (GPS, accelerometer), or whatever should be a limit. There exists at least one phone out there that can compare with all iPhone specs, so any app could be ported.
Therefore, the hardest app to make would be an Apple-specific app, such as the
Since you're asking about hardware features, there's nothing that the iPhone can do which another phone couldn't do. There are smart phones from other manufacturers which incorporate all of the functionality of the iPhone and more. So I don't think there's such a thing as an iPhone app which could not be made for another smartphone for any technical reason.