Google Duo
Google Duo is a video chat mobile app developed by Google , available on the Android and iOS operating systems . 
<triplet> Google Duo <subj> video chat <obj> use <subj> mobile app <obj> instance of <subj> Google <obj> developer <subj> Android <obj> operating system <subj> iOS <obj> operating system <triplet> Android <subj> Google <obj> developer