Lose It! is a free (yes, free) calorie-counting app that I like much better than the one I used before (Absolute Fitness; $15). Its database includes more foods that I eat (lots of strange vegetarian foods, which generally are lacking in these programs), and everything is simple and intuitive. Its best point is that I actually use it because it's so easy. I've tried several of these apps over the years on various platforms, and I gave up because it got too complicated. I've been using this one for a whole 2 weeks and haven't even felt like giving up. It lets you track exercise and activity as well (how many calories does 10 minutes of moderate sexual activity burn? Lose It! knows...).