Radii is a watch face that takes inspiration from the dynamics of a planetary system and simulates its workings onto a digital timepiece. The watch face features a centre that indicates the hour while a sphere carrying the minute rotates around it along its striped orbit. Additionally, a tiny moon glides around this sphere in sync with each stroke of the second hand. The watch face also has a scale that displays your battery life and a crescent that shows the day. Radii is compatible with various Wear OS smartwatches, including Google Pixel Watch, Samsung Galaxy Watch, and Fossil Smartwatches.

To manually set up Radii on your watch, you can follow these steps: open Play Store on your watch, scroll down until the section "Apps on your phone" appears, and select Radii under this section. Tap on "Install" and once it is installed, select "Set Watch Face". Radii comes with eight color themes and customizable color options.

Radii is created by Gaurav Singh and Krishna Prajapati, who have also designed other watch faces such as Roto 360, Tymometer, Time Tuner, and Roto Gears.