The Fitbit Charge, released in late 2014, adds an average of five steps per 100 steps taken, according to Matt Swider of Tech Radar. Using the popular goal of 10,000 steps per day, the Fitbit gives in an inaccurate reading of 10,500 steps. This inaccuracy is common among Fitbit devices.
All of the devices Fitbit manufacturers are designed to keep track of the number of steps the wearer takes. The more premium models include sleep-tracking features and auto-sleep detection to monitor sleep patterns. The Charge, Charge HR and Surge models are most beneficial for hardcore fitness enthusiasts, as they include heart rate monitors and features that keep track of the number of minutes the wearer is active, as well as the number of floors climbed during stair workouts. The only Fitbit device that can be synced to a smart device completely is the Charge HR, which allows the user to see incoming calls, text notifications and control his music without having to retrieve his smartphone, as of 2015.
Each Fitbit device connects to an application on a smart device to help the user keep track of his steps and sleeping patterns. The application allows the user to see his daily averages, as well as the number of steps his friends have taken, so long as they also have compatible Fitbit devices. The sleep tracker has three different colors to let the user see when he was awake, when he was asleep and when he was restless.