. Apple has partnered with Nike and has created an app called HealthKit. Users can set goals and track their progress through a single dashboard. Similarly, without a tracker, you can use the Fitbit app to count calories, log your weight, and record other health information, such as your blood pressure and glucose levels. MyFitnessPal is a mobile app and website that gives you a wealth of tools for tracking what and how much you eat, and how many calories you burn through activity.