LifeSum is described as 'Set a weight goal and we'll tell you how to reach it! Track what you eat and your exercises on the web or using your smartphone' and is a Calorie Tracker in the sport & health category. There are more than 100 alternatives to LifeSum for a variety of platforms, including iPhone, Android, iPad, Web-based and Android Tablet apps. The best LifeSum alternative is OpenNutriTracker, which is both free and Open Source. Other great apps like LifeSum are FoodYou, MyFitnessPal, Alma Nutrition and Fitbit.