If you select a tracker to be automatically tracked i.e, steps using Fitbit as a source, it means Sharecare will retrieve/read data from that device or application. There are several trackers you can automatically track depending on your Operating System (OS). Apple iOS includes; Steps, Sleep, Blood Pressure, and Blood Glucose. Android includes; Steps, Sleep, and Stress. Automatic tracking from a third-party will only work when you open the mobile app.