Released in the United States on August 16, 2016, Google Duo provides a new option for video chatting, joining the ranks of Skype, FaceTime, and Google Hangouts (to name just a few). This free application is available for both iOS and Android devices, however, to use Google Duo, both parties will need to download the application. A unique feature of this simple video-calling service is that it allows those you contact to see a video of you when they check your incoming call - allowing users to show off, say, a new pet or an acceptance letter as they "call" the other party.