Most fast-casual restaurants have some form of online ordering. Some use a third-party developer like Olo to expedite the orders, and others build their user interface from the ground up, so there can be a lot of variations in the user experiences. I’m going to be focusing on the mobile web experiences, since many of these services tend to have elements that don’t translate very well to mobile, but downloading each brand’s dedicated app is unnecessary unless they have a royalty program that you exploit fairly frequently.