Quack is an app that changes the way you interact with the people around you. Once daily and at a random time, the app makes the sound of a duck. It can go off at the gym, on your way to class, or in the bathroom - you never know when!

But there's a twist: The daily quack plays at the same time for everyone who has the app installed. So if you hear a flock of ducks, it's almost certain that someone near you also has the app.

Once the quack goes off, you'll have 60 seconds to confirm that you have heard it by tapping on a notification. Make it on time and you will earn points that you can spend on accessories for your duck.