In addition to Allo, Google filed an application for video calls image and likenessFaceTime of Apple and Microsoft/Skype. It’s Duo. The goal “is to make calls faster and more reliable video even on slower speed networks,” explains the company’s blog. Duo comes with a feature called Knock Knock showing a live video of the person who is calling before answering.
Both apps can be downloaded both the Play Store and iOSAppStore, as they will be available for Android or iOS. Both applications will be available on summer 2016.