iOS is the operating system developed by Apple for the iPhone and iPad, namely the mobile version of Mac OS X. iOS development is done in Objective-C. Derived from C and C ++, it is an Apple language not much taught and that yet requires special skills. IOS development requires some additional constraints compared to Android development such as the purchase of exclusively Apple equipment, more expensive licenses or a longer period and more restrictive criteria for the acceptance of applications in the AppStore. Otherwise, iOS provides a more successful and user friendly development environment as the one proposed on Android. The quality of the tutorials is also frequently emphasized by iOS developers.