Compare macOS and Linux for your needs.
Compare macOS and Linux for your needs.
MacOS 10.5+ meets strict Unix standards, while earlier OS versions technically comply. Apple didn’t charge for the OSX branding before 10.5. Linux serves as a version of Minux, a Unix-compatible kernel.
Linux and MacOS share some similarities thanks to gradual adaptation. They began in distinct directions with contrasting goals and eventually converged somewhat. I usually write lengthy pieces, but I’ll keep it concise—this explanation is a simplified version of how GNU/Linux originated in 1983. Richard Stallman announced his vision on Usenet: he was tired of NDAs and decided to create an open Unix-like system, offering it freely. He succeeded remarkably. The GNU initiative developed much of the essential software, including editors, compilers, shells, and utilities, some even for graphical interfaces. The only gap was a working kernel. GNU attempted to build one but eventually moved on, exploring existing options before returning to Hurd. After Linus Torvalds introduced a usable Unix kernel for IBM compatibles, development accelerated. By the early 90s, Stallman’s dream came true: a free, open-source Unix system embraced worldwide. The kernel name “Linux” became more popular than “GNU” because it was easier to remember and sounded closer to familiar names like Unix and Minix. This shift sparked countless debates, but ultimately, the aim was clear—provide a free operating system. Today, GNU/Linux is the dominant Unix alternative, running on nearly every device imaginable, from simple appliances to spacecraft. Meanwhile, MacOS emerged as Apple’s attempt to revive its earlier hardware ambitions, evolving from the Apple II and Lisa failures. Steve Jobs pushed for a closed, proprietary system, which succeeded with the Macintosh. However, IBM’s PC model relied on off-the-shelf parts and Microsoft’s DOS, making it easy to replicate. This cemented MS-DOS as the industry standard. As Apple faced competition, Jobs left to found NeXT, targeting academia and research. NeXT introduced powerful Unix-based workstations, though they struggled commercially. Apple eventually acquired NeXT to bring Jobs back, merging technologies and design. The result was OS X (now MacOS), blending Apple’s style with Unix roots. Throughout this journey, the two systems influenced each other—MacOS adopted GNU tools like Bash, while Linux integrated Apple services such as CUPS. Though they share some features, their origins, purposes, and business models remain fundamentally different.
Unless they meet the POSIX requirements, Unixes differ significantly from each other. They aren’t tied to any single kernel or definition like Linux. Many operate independently, drawing from BSD but not all are certified as Unix. It’s important to recognize that Unix isn’t just one operating system—it’s a collection of systems that have earned certification and must renew it. A Unix can shift between categories depending on its development and compliance with standards. Open source projects often skip formal certification since their designs allow frequent updates. Certification conflicts with their flexible, evolving nature and adds costs. Some even have proprietary Linux standards for specific features.
Back in the day there was a UNIX operating system, and now I mostly refer to Unix when I mean Unix. The BSDs aren't all officially certified but they have enough shared code and a similar structure that makes them feel closely connected, even Darwin counts in. Linux, on the other hand, is a completely different initiative, built from scratch without much focus on being certified as Unix.
Modern BSD has no original code and doesn’t include any from the early AT&T Unix versions. Their source files have been completely replaced long ago, long before MacOS or Darwin were created. From a logical standpoint, Apple’s MacOS is entirely separate from the original Unix. As I mentioned, Unix isn’t just about software or kernels—it’s a unified standard and certification that identifies it as Unix. If Microsoft aims to build an operating system based on their Windows NT kernel with a Unix twist, they can definitely do so.