Santa knows if you’ve been bad or good — and, now, so does Weight Watchers. The diet program just introduced its members to Weight Watchers 360°, a mobile app for iPhone and Android that’s designed to be a constant companion. Not only does it track food (with the help of a bar code scanner and a “Snap & Track” feature that lets you photograph a meal and assign a point value later), but it also focuses on your environment, says Catherine Ulrich, senior vice president of A “Spaces” function considers where you are (home, traveling, etc.) and your options, and offers “Panic Moment” advice. “Routines” helps you commit to small steps (such as eating breakfast). Add it all together, and that smartphone can connect you to long-term success.