MyFitnessPal

MyFitnessPal tracks calorie and nutrient intake using a very large database of foods, including branded products and restaurant items.

Database size is what makes calorie tracking practical: if the food you ate is not in the database, the habit breaks quickly, and this one has the widest coverage.

Entries are largely user-contributed, so nutritional values vary in accuracy — verified entries are more reliable than the first search result.