Darwin (operating system)

Darwin
Developer	Apple Inc.
Written in	C, C++, Objective-C, assembly language
OS family	Unix-like, FreeBSD, BSD
Working state	Current
Source model	currently open source with proprietary components, previously open source
Initial release	November 15, 2000
Latest release	24.0.0 / September 16, 2024
Repository	github.com/apple-oss-distributions/distribution-macOS
Platforms	Current: x86-64, 64-bit ARM, 32-bit ARM (32-bit ARM support is closed-source); Historical: PowerPC (32-bit and 64-bit), IA-32;
Kernel type	Hybrid (XNU)
Influenced by	NeXTSTEP, FreeBSD, BSD
Default; user interface	Command-line interface (Unix shell)
License	Mostly Apple Public Source License (APSL), with closed-source drivers
Official website	opensource.apple.com/releases/

Darwin is the core Unix-like operating system of macOS, iOS, watchOS, tvOS, iPadOS, audioOS, visionOS, and bridgeOS. It previously existed as an independent open-source operating system, first released by Apple Inc. in 2000. It is composed of code derived from NeXTSTEP, FreeBSD and other BSD operating systems, Mach, and other free software projects' code, as well as code developed by Apple. Darwin's unofficial mascot is Hexley the Platypus.

Darwin is mostly POSIX-compatible, but has never, by itself, been certified as compatible with any version of POSIX. Starting with Leopard, macOS has been certified as compatible with the Single UNIX Specification version 3 (SUSv3).