Apple Watch Ultra 4

Apple introduced the Apple Watch Ultra 4 on September 9, 2026, featuring a new Health Sensing System with the S11 chip that delivers the most accurate heart rate sensing in a wearable, along with higher-frequency measurements and a new readiness score for athletes. The watch offers extended battery life supporting up to 45 hours of outdoor workout tracking and the most accurate on-device GPS for sports, plus new Apple Intelligence-powered Siri features and a redesigned iPhone Health app with a Longevity tracking feature.