Xcode 4 is the new version of Apple's powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, Instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.

Xcode 4 has a streamlined new interface that integrates UI design, coding, testing, and debugging, all within a single window. The embedded Apple LLVM compiler underlines coding mistakes as you type, and is even smart enough to fix the problems for you automatically.