Google Play link: https://play.google.com/store/apps/details?id=com.versuslabs.duoquiz
When I look back to it, it was very weak at the technical level. I developed the Android client and the API while learning stuff at the same time. So, 4 years go by, and I decided to have another shot at it. So, in a sense, you're right, it did start off as a personal challenge to see just how much different the end product would be, given that I've now been working full time on Android for the past 4 years.
But other than that, it's actually quite different than QuizUp since this game is real-time and seems to have steered heavily away from what a normal trivia game is like. With their latest releases, they've sort of created a sort of massive social network around the questions/answers genre.
I wanted to make an app that went back to the basics. Something you can use here and there while killing time..open the app, have fun answering a few questions, and done.