Apple Watch Series 12 vs. Ultra 4: Key Differences and Pricing
Comparing the latest Apple smartwatches for fitness and durability.
1Introduction to Apple's Latest Watches
Apple unveiled the Watch Series 12 and Ultra 4 at its September event, both running WatchOS 27. The Series 12 starts at $400, while the Ultra 4 begins at $800. Both models maintain last year's prices despite iPhone increases. Preorders started immediately, with shipping set for September 18. The Ultra 4 offers more durability and features, justifying its higher price point for serious athletes and outdoor enthusiasts.
2Design and Materials Comparison
The Series 12 comes in 42mm and 46mm sizes with aluminum, titanium, or ceramic cases. The ceramic option adds 10g of weight. The Ultra 4 maintains its 49mm titanium-only design with a flat OLED Retina display. Both watches feature redesigned sensor arrays for improved heart rate monitoring every 5 seconds, a significant upgrade from previous 5-minute intervals. The Ultra 4's Action button remains customizable for quick workout access.
3Durability and Water Resistance
While both watches are IP6X dust resistant, the Ultra 4 outperforms in water resistance (100m vs 50m) and is rated for scuba diving to 40m. It meets MIL-STD 81H standards, functioning in extreme temperatures (-20° to 55°C) and surviving shocks. The Series 12 remains swimproof but lacks these extreme certifications. The Ultra 4's titanium build and larger size contribute to its ruggedness for adventure sports.
4Display and Brightness
Both models feature OLED displays, with the Series 12 reaching 2,000 nits brightness. The Ultra 4's larger display offers better visibility in direct sunlight. The Series 12 maintains rounded edges, while the Ultra 4's screen stretches flat to the edges. Apple hasn't increased resolution from previous models, focusing instead on software enhancements through WatchOS 27 for both displays.
5Performance and Storage
Both watches use the new S11 chip and include 64GB storage - a 100% increase from 2025 models. This allows for more offline music, apps, and workout data storage. The processor enables the 5-second heart rate monitoring and smoother third-party app performance. While storage is identical, the Ultra 4's larger battery helps maintain consistent performance during extended workouts.
6Battery Life Differences
The Series 12 offers 24 hours (38h in Low Power Mode), while the Ultra 4 lasts 50 hours (84h in Low Power). The Ultra 4 introduces Extended Workout modes: 25 hours by disabling some features, or 48 hours in Max Extended mode with reduced GPS and heart rate sampling. Fast charging brings the Series 12 to 80% in 30 minutes versus 45 minutes for the Ultra 4.
7Health and Fitness Features
Both watches track advanced metrics like running form and blood oxygen, with 5-second heart rate sampling. The Ultra 4 adds depth gauge and water temperature sensors for diving. WatchOS 27 introduces new workout types and recovery metrics. The Ultra 4's additional workout modes cater to ultramarathoners and multi-day adventurers, while the Series 12 suits daily fitness tracking.
8Pricing and Value Proposition
The Series 12 starts at $400 (aluminum) up to $899 for ceramic. The Ultra 4 remains at $800 (titanium only). Best Buy offers trade-in discounts and free Apple Fitness+ (4 months) and Music (3 months) with preorders. The Ultra 4 justifies its price for extreme athletes, while the Series 12 offers better value for most users. Neither model received a price increase from 2025.
9Final Recommendations
The Ultra 4 excels for extreme sports and outdoor adventures with its durability and battery life. The Series 12 meets most users' needs at half the price. Both benefit from WatchOS 27's software upgrades rather than major hardware changes. Buyers should consider their activity levels - the Ultra 4's advantages only matter for serious athletes, while the Series 12 covers everyday fitness beautifully.
Original article: CNET — Apple Watch Series 12 vs. Ultra 4: Key Differences and Pricing