First, enter your starting weight, your goal weight (if you want to lose, that is), height, and birth date, and the app figures how many calories you need to lose a few pounds or maintain your current weight. Then, enter exactly what you've eaten that day (you can search by meal, favorite foods, previous meals, even brand name foods from supermarkets and restaurants) and any exercise you've done. The app tracks your daily, weekly, and monthly caloric intake, factoring any exercise into the equation.
I'm certainly not shooting for any serious weight loss before January (hello pumpkin pie!), but it will be nice to know how many calories I'm consuming during non"cheat" days.