WatchOS

watchOS is the software for Apple Watch. The software can be updated by the paired iPhone in the Apple Watch app. The current version for watchOS is 2.2.2.

WatchOS 1.0

 * Based on iOS Version 8.2
 * Release Date: April 24th, 2015
 * Build Number: 12S507

WatchOS 1.0.1

 * Based on iOS Version 8.3
 * Release Date: May 19th, 2015
 * Build Number: 12S632

WatchOS 2.0

 * Based on iOS Version 9.0
 * Release Date: September 21st, 2015
 * Build Number: 13S344

WatchOS 2.0.1

 * Based on iOS Version 9.1
 * Release Date: October 21st, 2015
 * Build Number: 13S428

WatchOS 2.1

 * Based on iOS Version 9.2
 * Release Date: December 8th, 2015
 * Build Number: 13S661

WatchOS 2.2

 * Based on iOS Version 9.3
 * Release Date: March 21st, 2016
 * Build Number: 13V144

WatchOS 2.2.1

 * Based on iOS Version 9.3.2
 * Release Date: May 16th, 2016
 * Build Number: 13V420

WatchOS 2.2.2 (Current Version)

 * Based on iOS Version 9.3.3
 * Release Date: July 18th, 2016
 * Build Number: 13V604

WatchOS 3.0 Beta 3 (Current Beta)

 * Based on iOS Version 10.0
 * Release Date: July 18th, 2016
 * Build Number: 14S5290d