With the aid of the cross-platform frameworks, the developers can build the iOS applications. The X-code is free to download and it works only on the Mac, not on any other. This X-code provides lists of tools such as the iOS simulator. This simulator expresses how an app will look be viewed and also behave on the different devices. The storyboards can also be used to create the visual representation of a general app. The iOS architecture is defined in four elements such as the Cocoa Touch, Media, Core Services and Core OS. The key application framework includes the push notifications, multi-tasking including the touch-based input. The second element media enables the application to deliver the audio, video including the graphics capabilities. The developers can find the basic system services such as the core Foundation and Foundation Framework. It also supports the multiple features which include the location and the networking services. The Core Os provides a list of services such as the security, local authentication including the core Bluetooth frameworks. In order to launch a successful app, the developers can give priority to both the UI and UX design. The developers can have an option of the bundle file. This file defines each and every preference.