This heritage is highly visible for Cocoa developers, since the 'NS' prefix is ubiquitous in the framework, standing variously for NeXT STEP or NeXT/ Sun. The Cocoa API was created as the result of a 1993 collaboration between NeXT Computer and Sun Microsystems. Otherwise, Mac OS X 10.0 can only run iTunes 1.1.1 natively. ^ iTunes 2.0.4 can only run if Classic is installed.

Two minor updates, 1.1 and 1.1.1, can be applied to this version.

^ Keynote 1.0 is the only iLife program that is compatible with Mac OS X 10.2 'Jaguar'.

Afterwards, users could either revert to iChat or upgrade to a newer version of OS X (10.8 'Mountain Lion' for US$19.99, or 10.9 'Mavericks' or newer for free) to continue using Messages.

^ Messages 8.0bArchived April 17, 2017, at the Wayback Machine was a beta release that only functioned from February 16 to December 12, 2012.

List of macOS versions and the software they run First and third-party applications can be controlled programatically using the AppleScript framework, retained from the classic Mac OS, or using the newer Automator application that offers pre-written tasks that do not require programming knowledge. For the AppleâIntel transition, it was modified so that developers could build their applications as a universal binary, which provides compatibility with both the Intel-based and PowerPC-based Macintosh lines. Xcode provides interfaces to compilers that support several programming languages including C, C++, Objective-C, and Swift. Apple provides its own software development tools, most prominently an integrated development environment called Xcode. The architecture of macOS incorporates a layered design: the layered frameworks aid rapid development of applications by providing existing code for common tasks.

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