Clock You — Open Source Calendar App

Clock You is a clock and alarm app built with Material Design 3 (You).

It supports all the common features such as creating, modifying and scheduling alarms as well as having an inbuilt timer, stopwatch and world clock.

Clock You shines when it comes to widgets, it includes multiple modern, material you themed clock widgets.

It doesn't have any dependencies apart from the Android base and Material design libraries, therefore the app is very lightweight.