Xcode runs on OS X Mountain Lion and OS X Lion, and includes the Xcode IDE, Instruments, iOS Simulator, the latest Mac OS X and iOS SDKs, and hundreds of powerful features:

Innovative tools to help you create great apps
• Interface Builder is fully integrated as a design canvas within the Xcode IDE
• The Assistant shows files related to what you're editing, such as the header, superclass, or controller
• The Version editor shows a live source code comparison through Git or Subversion history
• Live Issues display errors as you type, and Fix-it can correct the mistakes for you
• Apple LLVM compiler is embedded within the IDE with support for Objective-C, C, and C++
• The new LLDB debugging engine is faster and more memory-efficient than GDB
• Instruments adds System Trace and new iOS instruments including OpenGL ES

Streamlined interface that is faster and easier to use
• Design your interface side by side with the backing source code
• Create connections from your GUI design directly to the related source code
• Use tabs to organize your workspace, or double-click to open files in a new window
• Schemes let you customize exactly how your app will build, run, profile, and deploy
• Debugging and console views slide in without disturbing your place in the editor

Professional editor keeps you focused on your code
• Click the Jump Bar at the top of the editor to instantly go to another file
• View message bubbles to see errors, warnings, and other issues right beside the code
• Use the ribbon on the left of the editor to fold your code, or highlight scope

Embedded Apple LLVM technology finds and fixes bugs for you
• Analyzer travels countless code paths looking for logical errors before they become bugs
• Live Issues underlines coding mistakes as you type with no need to build first
• Fix-it can confidently correct mistakes for you with just a keystroke
• Code completion for Objective-C, C, and C++ is incredibly fast and accurate

Instruments for visual performance analysis
• Compare CPU, disk, memory, and OpenGL performance as graphical tracks over time
• Identify performance bottlenecks then dive deep into the code to uncover the cause
• Monitor your app directly, or sample the entire system, with very little overhead

To test or deploy applications on an iOS device you must be a member of Apple's iOS Developer Program. To submit your Mac or iOS apps to the App Store you must be a member of the Mac or iOS Developer Program. Some features may require Internet access.

What's New in Version 4.5.2
• Support for iPad mini and iPad with Retina display (4th generation).
• Additional bug fixes and stability improvements.

Included in Xcode 4.5:
• SDKs for OS X 10.8 Mountain Lion and iOS 6.
• Auto Layout now supported on both OS X and iOS.
• New localization workflow can share a single base .xib or .storyboard file for multiple locales.
• OpenGL debugger for iOS analyzes performance and suggests improvements.
• Debugger watchpoints can be set when running on a connected iOS device.
• Objective-C @synthesize command is generated by default when using properties.
• Objective-C adds literal syntax for numbers, arrays, dictionaries, and expressions.
• Xcode 4.5 runs on both OS X Lion and OS X Mountain Lion.
• Enhanced for the MacBook Pro with Retina display.