Cost: FREE (iOS)
Any.do and its partner app Cal sync with your iPhone's reminders and calendar.
Pros: The app can predict task-related text while you type, which is a big timesaver. This app is sleek and fun, giving you motivational (if not cheesy) encouragement as you move throughout your tasks. On top of that, it uses simple, intuitive gestures--you can drag and drop action items swipe to mark tasks as complete. This is much speedier than some of its competitor apps. Ability to record tasks with voice.
Cons: Difficult to set a task with ease, without it landing in the wrong "folder." The default deadline if none is set is today, which means the app is less useful for things like a grocery list.