Jot it down.Enjoy checking it off.Groceries on the way home. A deadline you don't want to miss. A habit you'd like to keep. Do! gives your everyday to-dos a simple home: add a task, then double-tap when it's done.■ A thought, a note, a satisfying checkoffCatch a task while it's on your mind. Finished? Double-tap to mark it done. Even a small task deserves that little moment of satisfaction.■ Make ...