Apple's macOS quietly vanishes from the official Unix registry
Apple/macOS silently removed from official Unix registry
The Open Group's Register of UNIX Certified Products no longer lists Apple or macOS, despite the page's claims that certification ensures portability, compatibility, and global interoperability. The removal was silent, with no public announcement. The registry still promotes the benefits of UNIX certification for vendors, developers, and users.
Only systems that are fully compliant and certified according to the Single UNIX Specification are qualified to use the UNIX® trademark.