Within two days of its release, the app climbed to the number one spot on Google Play's list of free apps. An update in April 2017 lets users worldwide make audio-only calls. A "Knock Knock" feature, exclusively available on Android, lets users see a live preview of the caller before answering. The app automatically switches between Wi-Fi and cellular networks. Duo is based on phone numbers, allowing users to call someone from their contact list. End-to-end encryption is enabled by default. It is optimized for low-bandwidth networks. Google Duo lets users make video calls in high definition. It was announced at Google's developer conference on May 18, 2016, and began its worldwide release on August 16, 2016.
Google Duo is a video chat mobile app developed by Google, available on the Android and iOS operating systems.
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