What is the font that's used in Mac OS X's graphical user interface (GUI), in the menus, dialog boxes, etc.? Is it different from what was used in the classic Mac OS (i.e. OS 9 or older)? If so, what are the fonts back then? I like the font but never knew what it was. Thanks.
Since the release of OS X 10.11 (El Capitan) in 2014 the Mac system typeface family is San Francisco.
San Francisco is also used in iOS, WatchOS, and tvOS.