While there are undoubtedly a whole lot of video calling apps out there, a lot of them don't feature the most straightforward operating processes -- for example, FaceTime can only be used by iOS users, while Skype requires users to know each other's usernames. This is where the Google Duo video calling app comes in.
What's great about this particular video calling app is the fact that it simply requires the user's phone number in order to connect them with their contacts. As far as picture quality is concerned, the Google Duo app is designed to automatically scale the resolution depending on the bandwidth, while its ability to automatically switch between cellular data and WiFi is a worthwhile bonus feature.
With its simplified functioning, Google Duo proves that simple interfaces make for more satisfying communication experiences.