Walking speed has been associated with many clinical outcomes (e.g. frailty, mortality, joint replacement need, etc.). Accurately measuring walking speed (stride length x step count/time) typically requires significant clinician/staff time or a gait lab with specialized equipment (i.e., electronic timers or motion capture). In the present study, our goal was to measure “step count” via smartphones through novel software and to compare with that reported by step tracking software that come standard with iOS and Android smartphones as a first step in walking speed measurement.Our population was non-impaired individuals, 28.3 ± 9.9 years old. We collected data from 52 individuals, 6 conditions and 3 trials for each condition.