Trivia app QuizUp has been on a tear lately:

In just three weeks, the trivia game for iPhone has amassed 3.5 million registered users, New York Magazine reports. On its eighth day, QuizUp reached its 1 millionth user.

Now QuizUp is being hailed as the "fastest-growing iPhone game in history."

Draw Something, one of the hottest games last year, took about nine days to reach 1 million users. 

QuizUp is a free trivia game for iOS that offers more than 150,000 trivia questions in about 300 categories. 

The cool part about QuizUp is that you can challenge both your friends and strangers. Players can either compete in a quiz against their opponent in real-time or round-by-round. Each quiz has seven rounds that last ten seconds each.

While QuizUp is clearly attracting tons of users, it's not resonating with everyone. Business Insider's Alyson Shontell has a personal bone to pick with the app. QuizUp broadcasts to all of your friends just how many times you've lost. Now all her friends know, she says, that she's terrible at trivia.

Feels like a fad. Like Draw Something.