In Xcode 3.1 up to Xcode 4.6.3, it included the LLVM-GCC compiler, with front ends from the GNU Compiler Collection and a code generator based on LLVM. Up to Xcode 4.1, the Xcode suite included a modified version of the GNU Compiler Collection. The Xcode suite includes most of Apple's developer documentation, and built-in Interface Builder, an application used to construct graphical user interfaces. The main application of the suite is the integrated development environment (IDE), also named Xcode. Xcode also integrates built-in support for source code management using the Git version control system and protocol, allowing the user to create and clone Git repositories (which can be hosted on source code repository hosting sites such as GitHub, Bitbucket, and Perforce, or self-hosted using open-source software such as GitLab), and to commit, push, and pull changes, all from within Xcode, automating tasks that would traditionally be performed by using Git from the command line. Xcode includes the GUI tool Instruments, which runs atop a dynamic tracing framework, DTrace, created by Sun Microsystems and released as part of OpenSolaris. Using the iOS SDK, tvOS SDK, and watchOS SDK, Xcode can also be used to compile and debug applications for iOS, iPadOS, tvOS, and watchOS. These helped ease the transitions from 32-bit PowerPC to 64-bit PowerPC, from PowerPC to Intel x86, from 32-bit to 64-bit Intel, and from x86 to Apple silicon by allowing developers to distribute a single application to users and letting the operating system automatically choose the appropriate architecture at runtime. Xcode can build fat binary ( universal binary) files containing code for multiple architectures with the Mach-O executable format.

Third parties have added support for GNU Pascal, Free Pascal, Ada, C#, Go, Perl, and D. Xcode supports source code for the programming languages C, C++, Objective-C, Objective-C++, Java, AppleScript, Python, Ruby, ResEdit (Rez), and Swift, with a variety of programming models, including but not limited to Cocoa, Carbon, and Java. 4.5 Xcode 11.x - 13.x (since SwiftUI framework).4.4 Xcode 7.0 - 10.x (since Free On-Device Development).4.1 Xcode 1.0 - Xcode 2.x (before iOS support).3.5 Xcode 11.x - 13.x (since SwiftUI framework).

3.4 Xcode 7.0 - 10.x (since Free On-Device Development).3.1 Xcode 1.0 - Xcode 2.x (before iOS support).

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