WatchOS 1

watchOS 1 is the first version of watchOS, which was released on April 24, 2015.

Builds
watchOS 1 is the first released version of watchOS. It comes with iOS 8.2, not the original version. The first version of watchOS 1 is 1.0, which is based on iOS 8.2. The second version of watchOS 1 is 1.0.1, based on iOS 8.2.1 or 8.3.