The mobile operating software developed by Apple Inc. is known as iOS. Like any other smart phone iPhone is application based phone and as it is the highest grossing phone in the world the ios apps are like cherry on top. The ios apps can be found in Apple app store. Every year 300,000 apps are being added in iOS apps store. 75% of the all apps are available free of cost. One of the statistics says that the number of ios apps downloads per month is 75 billion. There are more than 1 million ios apps. Gaming apps tops the download chart.