A developer took it upon himself to create a handy chart with all of Apple's iOS devices, their key hardware characteristics and iOS software builds running. Even a brief glance reveals very little fragmentation as approximately 70 percent of all iOS devices in the wild are shown running iOS 5, the latest public version of Apple's mobile operating system.
The upcoming iOS 6 is already on five percent of devices in the wild and iOS 4 is still found on approximately ten percent of devices. On the hardware front, both the third-generation iPod touch/iPhone and newer plus all iPad models run on the ARMv7 application processor.
This makes software optimization much easier than on the Android platform, where a variety of form factors, hardware configurations and device models contribute to high fragmentation....