Ordering a double quarter pounder through the app will cost you 7.49 before taxes. Ordering it at the window will cost you 4.74. The app will reduce the sandwich to 1 slice of cheese, forcing you to pay .99 if you want the second slice that's supposed to come with it and then it charges you $1.79 for the second slice of beef. Wait in line and save your money. Convenience is not worth a 50% increase.