As the name suggests, MyFitnessPal is a community-oriented site designed to help you lose weight and track fitness goals. The mobile apps let you keep these features at your fingertips wherever you are. You can input or edit your goals, enter your caloric intake (food) and output (exercise) on the go, and add new food data to the library if it doesn't already exist. There's also a progress screen that lets you track your weight and view a graphical representation of how well--or poorly--you're doing.
To test the mobile bent of the service, we downloaded the associated app and gave it a whirl. The interface for MyFitnessPal is straightforward and easy to use, but not as visually appealing as some other fitness apps we've used. More of a problem for some will be the tiny writing that populates the search screen, as it creates a bit of eye-strain to read the multitude of options that are presented. We appreciate the multiadd function that lets you add several foods at once; a time-saver for anyone who eats similar meals from day to day.
On the plus side, MyFitnessPal offers a community aspect not offered by the other app, as well as a dedicated Web site with a variety of handy tools. There are calculators for BMR (basal metabolic rate), BMI (body mass index), and recipe nutritional info (to be fair, Lose It offers this functionality within its app). You can also create a personalized weight loss ticker for your profile, forum signature, or blog. In the end, if you're trying to get fit, pretty much any tool or support is better than none, and MyFitnessPal is free so it's definitely worth a look.