iOS: If you have diet restrictions or allergies, you probably have a mental list of common ingredients to watch out for and what to swap in instead, but you shouldn't have to rely on a mental list for everything. Substitutions is a one-stop app where you can quickly look up ingredient swaps on the fly.
Aside from common food allergies, like nuts or shellfish, Substitutions also shows you ingredients to switch out if you're on a certain diet, like low carb, vegetarian, or gluten free. You can also easily search for specific ingredient swaps in case you're missing a few ingredients and don't want to run to the store. The app does cost $US2.99 ($4), so it's best suited for those who look up these kinds of ingredient swaps often. If you substitute ingredients infrequently, you're better off just looking them up online for free when the need arises.
Substitutions ($US2.99 ($4)) [iTunes App Store]