SAN FRANCISCO - Google's video chat app Duo has now been downloaded more than 1 billion times on Google Play. The company launched Duo in 2016 along with instant messaging app Allo with much fanfare."Duo hit 500 million downloads just six months ago, so another 500 million in that time span is pretty impressive," tech website Android Police reported late on Saturday. In 2018, the company has launched Duo support for iPad, Android Tablet, Chromebook, and Smart Displays.