List of mobile operating systems (active now)

Android 4.4 KitKat is a version of the Android mobile operating system developed by Google, spanning versions between 4.4 and 4.4.4. Unveiled on September 3, 2013, KitKat focused primarily on optimizing the operating system for im...

Android Lollipop is a version of the Android mobile operating system developed by Google, spanning versions between 5.0 and 5.1.1. Unveiled on June 25, 2014, during the Google I/O conference, it became available through official o...

Android 6.0 Marshmallow is a version of the Android mobile operating system developed by Google. First unveiled in May 2015 at Google I/O under the codename "Android 'M'", it was officially released in October 2015. Marshmallow pr...

iOS 9 is the ninth major release of iOS, the mobile operating system by Apple Inc. It is the successor to iOS 8 and focuses less on new features and more on under-the-hood optimizations, as well as battery improvements. It was ann...

iPhone OS 1 is the first major release of iOS. iPhone OS 1.1.5 is the latest and final version of iPhone OS 1. This version of iOS was the first iteration of Apple's touch-centric mobile operating system. No official name given on...

Windows Phone 7 was the first release of the Windows Phone mobile client operating system, released worldwide on October 21, 2010, and in the United States on November 8, 2010. It received multiple large updates, the last being Wi...

Windows Phone 8 is the second generation of the Windows Phone mobile operating system from Microsoft. It was released on October 29, 2012, and like its predecessor, it features a flat user interface based on Metro design language...

Windows Phone 8.1, rolled out at Microsoft´s Build Conference in San Francisco, California, on April 2, 2014, is the third generation of Microsoft's Windows Phone mobile operating system, succeeding Windows Phone 8. It was release...