It's a little confusing, the VA3 is a watch, and also a computer. "Watch faces" are a type of software (people call software "apps" now) but Garmin means a particular thing by "app." A VA3 can run 4 different types of custom software: watch faces, widgets, data fields, and apps. In Garmin speak, an app is a way of recording an activity. The built in "bike" app is sufficient.
I really like
this watch face, and
these widgets.