The company said it designed the app, in part, to get rid of the frustration of dropped video calls.
It said the app will automatically switch between cellular and Wi-Fi networks and adjust to slower networks without dropping the call.
One of the app's features, called "Knock Knock," allows users to see what the caller is doing before accepting the call.
Setup is described as simple, too. All you need is your phone number. Like some of Facebook's apps, Google Duo doesn't require a login.
Google Duo works on Android and iOS.