Apple Watch Series 12 vs. Ultra 4 Buyer's Guide

The Apple Watch Series 12 and Apple Watch Ultra 4 bring new health sensors, a new chip, and more detailed recovery insights to Apple's smartwatch lineup, so how do they compare? Both models feature the S11 chip, 4GB of RAM, 64GB of storage, and the new Health Sensing System, which measures heart rate every five seconds throughout the day. They also share Readiness, Recovery HRV, daytime vitals, improved step tracking, hypertension notifications, sleep apnea notifications, Sleep Score, and more.