Google has today unveiled a new app called Duo that will work on both Android and iOS, offering user with the ability to call their friends and family from their smartphone.

The app will be a bit different from your normal video calling application, however, featuring something that Google calls Knock Knock, a feature that will show a live stream of the user who is calling before you even pick up.

This allows you to see context about that call before you even pick it up.

Duo has also been built to be fast, using both QUIC and WebRTC technology in order to make sure that video is both encrypted, whilst being fast to load and use.

On top of that, Duo will monitor network quality to degrade video streams automatically, with up to HD video and audio quality.

Duo will be available this summer on Android and iOS.

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