DunDun is a focused squat counter built around motion sensors. It works with Apple Watch, iPhone, or even AirPods — using real-time motion data to detect squats without manual tapping or camera tracking. Designed for quick home or gym workouts, the interface stays minimal and distraction-free. No ads, no complicated setup — just open and start training. Built by the developer behind YaoYao, with years of experience designing for watchOS.