120, 5 ( 3.8 )
Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices.
140, 3 ( 4.0 )
Apple iOS is a proprietary mobile operating system that runs on the iPhone, iPad and iPod Touch. Apple iOS is based on the Mac OS X operating system.
90, 5 ( 3.8 )
Objective-C is a general-purpose, object-oriented programming language that adds Smalltalk-style messaging to the C programming language.