KnowledgeBook: Cooking doesn't contain any recipes, but cooks will find this app indispensable. Instead of recipes, KnowledgeBook: Cooking has all the tidbits of information that anyone putting together a recipe really needs. This app's handy reference guide includes ingredient substitutes, a comprehensive culinary glossary, measurement conversions, and temperature information.

Discover what can be substituted for buttermilk, how many bananas it takes to make one cup of slices, how many cups are in a pint, and what temperature an oven should be set to if the recipe calls for a "moderately hot" oven. This app also helps you decipher arcane kitchen terms such as "papillote" and "chiffonade." KnowledgeBook: Cooking also includes cooking instructions for high altitude as well as a comprehensive yield list of fruits, vegetables, and other ingredients, from apples to yeast.

This app features a measurement calculator that makes unit conversion a snap. When you are on the measurement screen, select which measurement you wish to convert, and a calculator will come up. You simply tap in a number, and viola! Your measurement is automatically converted in every relevant unit. For example, if you enter in "3" for tablespoons, your 3 tablespoons will be converted in general, US, Imperial, Australian, metric, informal, and even ancient measurements.