Fitbit is described as 'Say hello to one of the world’s leading apps for health and fitness. Use the Fitbit app on its own to track basic stats and stay motivated on your journey. Or, get a Fitbit tracker or smartwatch to see how your activity, workouts, sleep, nutrition and stress all fit together' and is an app in the sport & health category. There are more than 25 alternatives to Fitbit for a variety of platforms, including iPhone, Android, iPad, Apple Watch and Linux apps. The best Fitbit alternative is Gadgetbridge, which is both free and Open Source. Other great apps like Fitbit are Garmin Connect, watchOS, Amazfish and Treekly.