Clock is a timekeeping mobile app available since the initial launch of the iPhone and iPhone OS 1 in 2007,[1] with a version later released for iPads with iOS 6 (however could unofficially be installed before[2]),[3] and Macs with the release of macOS Ventura.

[4][5][6] On watchOS, each function of the clock is split into four separate applications and in some cases offer additional or enhanced features.

[9] Alarms will play a chime and vibration once completed, which the user can choose from their music or ringtone libraries, and can be set to repeat on particular days of the week.

[12] Additionally, the watchOS version of stopwatch also includes graph and hybrid faces.

When the timer reaches zero, a chime will be sounded chosen from the user's ringtone library.