How Does Fitbit Track Steps? Fitbit uses a 3-axis accelerometer along with a step counting algorithm to keep track of your movements.

For clarification, the March 2025 update changes to the steps algorithm were supposed to increase accuracy for step counting in more challenging situations.

The Apple Health algorithm works around the concept of a ‘priority’ device. This priority device’s steps are then used in all instances except where that device is completely unavailable.