Google Duo was secretly developed by Google, a video calling app although there are several in the system like IMO, Skype, Tango, Viber, Facebook Messenger, Google’s Hangout, Apple’s FaceTime, BBM, ICQ, JusTalk, KakaoTalk, LINE, WeChat etc.
It has a smooth minimalist interface that fades away, and it supports HD video and audio. The app is a simple 1-to-1 video calling app available for Android and iOS. Duo takes the complexity out of video calling, so that you can be together in the moment wherever you are.
The essence of Google Duo is summed up in its three main areas:
1. Simple interface
Duo is simple from start to finish. To get started, all you need is your phone number and you’ll be able to reach people in your phone’s contacts list. No separate account is required, so you can sign up in just a few steps. From there, you can instantly begin a video call with a single tap.
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2. Fast and reliable
We all know how it feels when a call fails to connect or when video gets choppy. We’ve built Duo to be fast and reliable, so that video calls connect quickly and work well even on slower networks. Call quality adjusts to changing network conditions to keep you connected — when bandwidth is limited, Duo will gracefully reduce the resolution to keep the call going smoothly. For video calls on the go, Duo will switch between Wi-Fi and cellular data automatically without dropping your call. You can start your call at home, and continue seamlessly even when you head out the door.
3. Human design
We designed Duo to feel warm and inviting, focused on just you and the person you’re calling. To make calls feel more like an invitation rather than an interruption, we created a feature in Duo called Knock Knock which lets you see live video of your caller before you answer, giving you a sense of what they’re up to and why they want to chat. Knock Knock makes video calling more spontaneous and welcoming, helping you connect with the person before you even pick up.
Source: Google Blog