Guardian Watch Face is a personalization app developed by thema for Android devices. It is compatible with Wear OS watches and can also be used as a clock widget on mobiles. However, it is not compatible with Samsung Gear S2, Gear S3, and Galaxy Watch running Tizen OS. The app offers several features, including clock widget, design color options, secondary timezone for digital display, day and month, watch and mobile battery status, weather updates, daily step count, heartbeat frequency, unread SMS, unread email from Gmail, missed calls, and presets. The settings can be accessed through the Wear OS app on your mobile device. The app has both free and premium settings, and the premium settings provide more customization options.

The installation process is easy, and the watch face will be installed automatically on Wear OS 1.X and through a notification on Wear OS 2.X after installation on mobile. The mobile clock widget can be customized by long-pressing on the launcher and selecting the application widget. The app is available for free on the Play Store, and if you face any issues or have questions, you can contact the developer through email.