Announced almost three months ago at its I/O 2016 developer conference, Google today is launching Duo, "a simple 1-to-1 video calling app for everyone".
Of course, it's not for everyone; it's for Android and iPhone users. Windows phone users are out - unsurprisingly - but there's also no web interface. You also won't find the app available on iPads or even Android tablets.
One of Google's selling points for Duo is a simple interface. Interestingly, you won't even need to sign into a Google account. Everything will work with just your phone number.
Another feature that the company has touted is called Knock Knock. This will allow you to see your caller before you actually answer (see GIF below). The feature is meant to make "video calling more spontaneous and welcoming, helping you connect with the person before you even pick up." Of course, after dialing, you might want to make sure that your husband isn't talking about how annoying his mother-in-law is when calling her for Christmas.
Finally, all of your calls will be end-to-end encrypted, as Google promises that Duo has an emphasis on privacy and security.
You can download Google Duo from the following locations: