Sensor Tower data shows that burger chains experienced the strongest growth in MAUs over the past few years, driven by outsized investments in advertising by top players in the space. Increased promotions, higher prices and app development in the QSR space have made it far more difficult to effectively acquire and retain customers on mobile. Chick-fil-a is the most popular breakfast option on mobile, while Domino's is a top choice for dinner based on app usage per time of day.