Google Duo: The Old Version

Think of Google Duo as looking through a peephole to see who's knocking – hence the name. When someone calls with Duo, the app turns on the caller’s video camera (but not the microphone) and displays a live feed to the recipient. This unique feature is called Knock Knock.

Duo is compatible with all current iOS devices, and I had no trouble installing it on my iPhone 6. The Android app works on devices running operating system versions as old as 4.1, while the iPhone version only works on iOS 9 or later – although that’s most iPhones.

Google announced Duo at this year's Google I/O conference, along with Google Home and Allo, a text chatting app that bakes in the new Google Assistant bot. While some of its features are clever, Duo isn't tightly integrated enough with Apple or Google and is more limited as an iPhone app than on Android.

Despite being a newcomer to the video chatting scene, Duo is intended to make video chatting easier and more accessible than ever. In a rare move, Google recently unleashed its Duo video chat app simultaneously on Android and iOS.

Google duo old version