Google Duo, the new video calling service from Google was introduced in May at the company's I/O developer conference. Yes, it is like other video calling app but it comes with one difference though - you can see a live video feed of who's calling you even before you pick up the call.
What's noteworthy is that within a few days after its release Google Duo has climbed to the No. 2 spot on Google's list of top-free apps for Android. It beats the biggest and most-sought after hit game Pokemon Go. The first place is still held by Facebook Messenger.
Also, the Google app is gaining fame on Apple devices too. It's on No.22 position for iPhone users' free apps and No. 4 in the free social-networking app category.