iOS only: If all Cook's Illustrated offered on the iPhone was recipes, it would easily settle into a very large pile. But the Cook's app, like the magazine, gives you background knowledge, recommends ingredient brands and walks you through every step.
Non-subscribers to Cook's get 50 recipes from the app, but those recipes are tested over and over again until the result is something you can usually bank on to pull off yourself. Video demonstrations are provided for key portions of the recipe, and if you're wondering which Worcestershire sauce to use with your steak, well, they've probably tasted about 10 of them.
Cook's Illustrated is a free download for iOS devices only. Subscribers to Cook's website get access to the magazine's online archive through the app, along with other services.