iTunes offers downloads of Not Hotdog for iPhone and iPad for free. It's being offered at no cost because its developer is now very rich. Take a photo of your meal and the app will tell you if your food is either a "hotdog" or "not hotdog."

Of note, it's currently unavailable for Android, which means Android users will have to foolishly rely on their own senses and experiences to determine what is/isn't a hot dog.