Google Duo is a one-to-one video calling app with a slew of other video-calling app alternatives, such as FaceTime, WhatsApp video, and so on, Google claims that Duo is designed with user experience as top priority: You call people by their phone number, not by their Google Account.
Registration requiring only using your phone number in your contact list. It’s similar to how one registers for WhatsApp service. Both parties still must have Duo installed, though.
Google also accepts Google Voice number as a valid number to register.
Another point that Google would like to stress is that they claim to deliver lightning fast video call. They’ve optimized every aspect of a video call to ensure that calls connect faster than most other video calling apps and audio and video stays in sync, even on slower networks.
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