John Gruber har sin vana trogen gått till botten med vari skillnaden, respektive likheten mellan iPhones OS X och vanliga Mac OS X ligger.

”In other words, the iPhone’s version of OS X contains everything from Mac OS X that’s applicable to a mobile phone, plus new bits specific to the phone. It’s a “full” version of OS X not because it contains everything from Mac OS X, but because it contains everything you’d actually want from Mac OS X.”