If you have a food allergy, you know it can be a pain to get a straight answer out of sometimes-clueless waitstaff or cashiers who have no idea whether the item on the menu you want is made with eggs, peanuts, or anything else specific. That's where Allergy Assassin comes in. The app, available for iPhone and Android, uses a database of recipes and dishes and your saved food allergies to warn you whether a dish is safe to eat long before it's time to order.
Allergy Assassin is by no means perfect: it can't tell you whether or not a specific dish at a specific restaurant is made with products you may be allergic to, but it can give you a general idea of whether or not a dish you've never heard of before includes something that's no good for you. Just enter your food allergies into the app, save them, and the next time you're out to eat, type the name of the dish into the app. It'll churn for a bit, but eventually let you know whether you should be cautious or you're good to go.
For safety's sake though, even if the app says you're good to go, we would strongly suggest checking with the staff or chef to make sure you're in the clear. We're being a little tongue-in-cheek about how helpful people can be when presented with a food allergy, but in all truth a mobile app is a great general reference but it shouldn't be the final say. Allergy Assassin is $0.99 in the iTunes App Store and at Google Play.