Finally got the 1 cent whopper to work. The trick is clicking on the coupon multiple times to 1st unlock it, then to order it, which the app calls "apply". When it crashes, restart it. Unfortunately, didn't discover the buy 1 get 1 free deal way down the list until after paying full price for one.

Writing a mobile fast food app may sound like the most banal job, but it solves some incredible problems. There's no more waiting in line or having other people waiting for you to order. You can pick items from a very complicated menu on your own time & the server can handle unlimited numbers of people taking their own time.

The phone interface is a lot more appetizing than a crusty store menu. Unlike ordering from a web browser 10 years ago, the phone can be near the store.

It's a lot more appetizing than the food delivery startups 5 years ago. There's a lot more room for the vendor to make the menu look good. You can quickly get the food yourself instead of waiting an hour for a sweaty hipster to bike it to you after picking up 5 other orders around the city.

For all the hype given to ordering from a TV screen in the store, the phone app is what's really going to send fast food cashiers the way of grocery store cashiers.