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Re:No-Code and the IKEA Effect: Software lock-in evolved to ... by AnthonyMouse on Sunday November 01, 2020 @11:44AM (#24960635)
macOS/iOS is based on a hybrid of the Mach kernel and the BSD kernel:

https://en.wikipedia.org/wiki/XNU

And Mach too is available under BSD-like terms.

Re:No-Code and the IKEA Effect: Software lock-in evolved to ... by p_l on Sunday November 01, 2020 @03:29PM (#24962235)
It's important to remember it's not Free/Net/OpenBSD based, though, even if it had used bits and pieces from there to update its OSFMK derived kernel (OSFMK shared common origin point with NeXTSTEP kernel).

Arguably one can just call it Mach, as the bsd server part was delivered as part of Mach.