![]() The heritage of Darwin began with Unix derivatives supplemented by aspects of NeXT's NeXTSTEP operating system (later, since version 4.0, known as OPENSTEP), first released in 1989. History Simplified history of Unix-like operating systems Starting with Leopard, macOS has been certified as compatible with the Single UNIX Specification version 3 (SUSv3). Darwin 16–19 OS X rebranded into macOSĭarwin is mostly POSIX-compatible, but has never, by itself, been certified as compatible with any version of POSIX.Darwin 12–15 Mac OS X rebranded into OS X.Darwin 10-11 iPhone OS rebranded to iOS.Darwin 0–8 and corresponding Mac OS X releases.It is composed of code derived from NeXTSTEP, BSD, Mach, and other free software projects' code, as well as code developed by Apple. It previously existed as an independent open-source operating system, first released by Apple Inc. Darwin is the core Unix operating system of macOS (previously OS X and Mac OS X), iOS, watchOS, tvOS, iPadOS, visionOS, and bridgeOS. ![]()
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