Apple Watch Ultra 4 vs. Apple Watch Ultra 3: Apple's premium smartwatch

Apple introduced the Apple Watch Ultra 4 alongside the iPhone Duo and iPhone 18 Pro. The design and 49mm titanium case remain unchanged, but inside is a new S11 chip based on A20 Pro, a redesigned health sensor system, and Apple Intelligence features. Background heart rate is measured every 5 seconds—60 times more often than Ultra 3—and heart rate variability 24 times more often.

• S11 chip based on A20 Pro: faster CPU, GPU, Neural Engine, 50% larger cache
• Background heart rate every 5 seconds—60 times more often than Ultra 3
• HRV measured every 5 minutes—24 times more often than predecessor
• LTPO3 display at 3000 nits, 49mm case, 63g weight, water resistance to 100m