You can walk in and order, however, you can make more options in person, such as Columbia Harbor House, you can make your trio combo (Shrimp/Chicken/Fish) just two or just one and the app will not let you. At Casey's you can create your own hot dog (such as pulled pork with mac and cheese) but on the app you can't, nor is it on the menu but they will make it for you. Keep in mind that as soon as you order on the mobil app and click you are here, they start to prepare your food and you will have it ready before the people in line even order their food at the register so you can save a good 10-15 minutes or longer on a busy day.