Barefoot Solutions develops iPhone applications by using a combination of open source programming and licensed software. This agency carefully follows the strict guidelines that have been set by Apple and its affiliates worldwide. For example, the Swift script is laid out on the back ends of custom apps that are designed specifically for various versions of the iPhone. This is a complex programming language that is compatible with the iOS platform, which comes standard on all of Apple's smartphones and tablets. Another important technology in iPhone app development is known as Cocoa Touch. This framework defines the user interface of just about any publication for Apple's gadgets that come with touch screens. The Cocoa Touch platform ensures that apps respond promptly to the slightest tap on the screen. Objective-C is an open source syntax that makes up the structure of Cocoa Touch and other object-oriented languages that are used in app design.