Legion Watch Face is a personalization app for Android devices that can be used as a watch face on Wear OS smartwatches or as a clock widget on mobile devices. It is developed by thema and is available for free on the Google Play Store. However, it is not compatible with Samsung Gear S2/S3 running Tizen OS.

The Legion Watch Face has a range of features, including the ability to choose design colors, display day and month, show watch and mobile battery levels, and display weather information (requires phone app). The settings for the watch face can be accessed through the "Wear OS" app on the mobile device.

The app offers both free and premium settings, including the option to change the title, switch between different modes, choose a background, and define a secondary timezone. The app also allows for interactivity, with the ability to access detailed data by touching a widget, switch displayed data, and change the shortcut to execute on the four positions.

Overall, the Legion Watch Face is a useful and customizable tool for personalizing your Wear OS smartwatch or mobile device.