WatchOS 5

watchOS 5 is the fifth major release of watchOS for the Apple Watch series developed and distributed by Apple Inc. It was announced at the 2018 Worldwide Developers Conference alongside iOS 12, tvOS 12 and macOS Mojave.

New features
watchOS 5 introduces WebKit integration. Though not directly accessible, users can visit webpages through WebKit's browser engine by using Messages to send themselves a URL and then clicking the URL.

Product history
watchOS 5 is derived from iOS 12; both were announced on June 4, 2018 during the keynote address at WWDC 2018, when it became available to developers. It was released to the public on September 20, 2018.

Supported models

 * Apple Watch Series 1
 * Apple Watch Series 2
 * Apple Watch Series 3
 * Apple Watch Series 4 (included with initial release)
 * Support ended for the original Apple Watch (Series "zero").