iOS, the operating system for the world's most popular smartphone, iPhone debuted back in 2007. iOS apps are designed to be exclusively run on iPhones hence are highly specific and provide efficient usage of all the sensors data to create a wonderful experience for the users. iOS apps are written on Swift, C#, Objective C, Flutter and React Native (for cross platform development),HTML5 (for building web applications for iOS). However, Swift and C# are Apple’s choice for development of apps.