Both apps will be available later this summer.
It s encrypted, and based on your phone number.
Duo works wherever you are, Kay said, and it proactively monitors network quality several times a second and switches seamlessly between Wi-Fi and cellular.
Duo also has an interesting and potentially controversial feature: Knock Knock, which shows you a live video stream of the caller before the connection is actually initiated.
Not only can you see who s calling, but why they re calling, and what they re up to: A smile, a beach, a newborn baby, Kay said.
Here s a closer look at the experience:
What does this mean for Google Hangouts, Google s existing video app?