WatchOS 2

watchOS 2 is the second major release of watchOS for the Apple Watch series developed and distributed by Apple Inc. It was announced at the 2015 Worldwide Developers Conference alongside iOS 9, tvOS 9 and OS X El Capitan.

Product history
watchOS 2 is derived from iOS 9; both were announced on June 8, 2015 during the keynote address at WWDC 2015, when it became available to developers. It was released to the public on September 21, 2015.

Supported models

 * Apple Watch (original)