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  2. iOS - Wikipedia

    en.wikipedia.org/wiki/IOS

    iOS Commercial logo as used by Apple, since 2017 Screenshot iOS 15 running on an iPhone 12 Pro Developer Apple Inc. Written in C, C++, Objective-C, Swift, assembly language OS family Unix-like, based on Darwin (BSD), macOS Working state Current Source model Closed, with open-source components Initial release June 29, 2007 ; 14 years ago (2007-06-29) Latest release 15.1.1 (19B81) (November 17 ...