A self-contained, real-time self-use gait therapy device with a gait sensor, actuator, output speaker, and battery receptacle enclosed in a component case with a belt clip. Based upon step duration, step impact force, or step form data generated by the gait sensor, the actuator drives the speaker, producing beeps on a real-time basis with the pitch of each beep being a function of the step duration, step impact force, or step form for each step of the user. The speaker output is monitored and used by the user on a real-time basis to modify and improve his or her gait.