More problematic is how Knock Knock works on the iPhone. I could easily see recipients, in particular, being confused, and perhaps mistakenly believing that their camera is also on, without their permission. For one thing, callers are informed that their cameras are on, but recipients aren't told that their cameras are off. It's an excellent idea, but its implementation is a bit troublesome. Think of it 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. (Opens in a new window) Read Our Skype (for iPhone) Reviewĭuo's killer feature is Knock Knock. It's compatible with all current iOS devices, and I had no trouble installing it on my iPhone 6 ( at Amazon) (Opens in a new window). While the Android app works on devices running operating system versions as old as 4.1, the iPhone version only works on iOS 9 or later-then again, that's most iPhones. Duo is the only product to have yet seen the light of day, however.

Google announced Duo at this year's Google I/O conference, along with Google Home, an Amazon Echo competitor, and Allo, a text chatting app that bakes in the new Google Assistant bot. It just can't compete with Apple's excellent FaceTime service and Facebook Messenger (both of which are Editors' Choice winners) or Google's own Hangouts. 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. 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. How to Set Up Two-Factor Authentication.

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Install google duo app