Xcode is the complete toolset to build Mac OSX and iOS applications. With Xcode 4, the developers tools have been redesigned to be faster, easier to use, and more helpful. The Xcode IDE understands every detail of your project, identifies mistakes in both logic and syntax, and even fix your code for you. Xcode 4 will help you write better code for Mac OSX and iOS applications. Xcode 4 has a brand new user interface, built upon technologies that Apple itself uses to build Mac OSX and iOS, and that have produced over a quarter million Mac OS X and iOS apps.