iOS 11 running on an iPhone 7 Plus Developer Apple Inc. Written in C, C++, Objective-C, Swift OS family Unix-like, based on Darwin(BSD), macOS Working state Current Source model Closed source Initial release June 29, 2007; 11 years ago Latest release 11.4(15F79) (May 29, 2018; 35 days ago)  Latest preview 11.4.1 Beta 5 (15G5077a)(July 2, 2018; 1 day ago)  12.0 Public Beta 1 (June 25, 2018; 8 days