FitBit line: Fitbit Ultra, Fitbit One, Fitbit Zip, Fitbit Flex, Fitbit Flex 2, Fitbit Force, Fitbit Charge, Fitbit Charge HR, Fitbit Charge 2, Fitbit Surge, Fitbit Aria, Fitbit Aria 2, Fitbit Blaze, Fitbit Alta, Fitbit Alta HR, Fitbit Ionic, Fitbit Versa, Fitbit Ace
The Fitbit Tracker was a small black and teal device that could be clipped discreetly onto clothing and worn 24/7. It uses a three-dimensional accelerometer to sense user movement. The Tracker measures steps taken and combines it with user data to calculate distance walked, calories burned, floors climbed and activity duration and intensity. It uses an OLED display to display this and other information such as the battery level. It also measures sleep quality by tracking periods of restlessness, how long it takes the wearer to fall asleep and how long they are actually asleep.
A wireless base station is included to receive data from the Tracker and to charge its battery. When connected to a computer, the base station will upload data to the Fitbit website, where a number of features are available: seeing an overview of physical activity, setting and tracking goals, keeping food and activity logs and interacting with friends. Use of the website is free.
The Fitbit Classic tracked only steps taken, distance traveled, calories burned, activity intensity and sleep.
At the TechCrunch50 during the "Mobile" session on September 9, 2008, Fitbit received positive reactions during its panel from experts like Rafe Needleman, Tim O'Reilly, and Evan Williams who cited its wearability, price, and lack of subscription fees.