*Android App Development* Android is Googles Operating System designed for handheld devices. It ranges from small screen smart watches to Large Tablets and Automobile infotainment systems. Android is a free to use Operating system that can be highly customized to intended needs. Main android development apps are built for smartphones and the customized versions are run on watches and Android Auto. The apps are developed using Java and most recently the newly developed Kotlin using Android Studio. *iOS App Development * iOS is Apple's Mobile operating system designed for iPhone’s and iPad’s, a custom version of which powers the Apple Watch, Apple TV and Apple CarPlay. Unlike android, iOS is not open and is only available for Apple’s own ecosystem. Applications developed in iOS are using Objective C or Swift Languages. All developments for apple products are using Apple’s in house developed Xcode Software. Apps developed for the Apple ecosystem always has the gross financial potential compared to Android platforms.