The Apple Watch Ultra 4 arrives three years after the Ultra 2. Across those two generations, Apple added satellite connectivity, a larger display, new health sensors, and longer battery life. Are those changes enough to justify replacing an Ultra 2 or paying more for the newest model?
Both watches retain a 49mm titanium case, an Action button, a siren, a 3,000-nit display, dual-frequency GPS, and support for recreational diving to 40 meters. The Apple Watch Ultra 4 starts at $799 in the U.S. Apple has discontinued the Ultra 2, although its refurbished store currently lists it from $589. Here are the key differences between the two models:
| Apple Watch Ultra 2 | Apple Watch Ultra 4 |
|---|---|
| LTPO2 OLED display with always-on | Wide-angle LTPO3 OLED display with 1Hz always-on refresh |
| 410 by 502 pixels; 1,185 sq mm display area | 422 by 514 pixels; 1,245 sq mm display area (5% larger) |
| S9 chip | S11 chip |
| 2GB RAM | 4GB RAM |
| Electrical heart sensor and third-generation optical heart sensor | Health Sensing System with new electrical and always-on optical heart sensors |
| Background heart-rate measurements | Background heart-rate measurements every five seconds |
| Heart-rate variability (HRV) measurements | More frequent measurements of overall HRV and Recovery HRV |
| Overnight Vitals view | Overnight and daytime Vitals views |
| Readiness app | |
| Step tracking | More accurate all-day step tracking and a Steps watch-face complication |
| LTE and UMTS cellular connectivity | LTE and 5G cellular connectivity |
| Emergency SOS, Messages, and Find My via satellite | |
| Audio Intelligence: Sound Recognition, automatic music identification, Live Rewind, and Siri Recap | |
| Up to 36 hours of normal use | Up to 50 hours of normal use |
| Up to 72 hours in Low Power Mode | Up to 84 hours in Low Power Mode |
| Up to 12 hours of standard outdoor workout tracking | Up to 18 hours of standard outdoor workout tracking |
| Up to 17 hours of outdoor workout tracking in Low Power Mode with full GPS and heart-rate readings | Up to 25 hours in Extended Workout mode with full GPS and heart-rate readings |
| Up to 35 hours of outdoor workout tracking with fewer GPS and heart-rate readings | Up to 45 hours in Max Extended Workout mode, with GPS readings every second |
| Charges from 0 to 80% in about one hour | Charges from 0 to 80% in about 45 minutes |
| Natural titanium: 61.4 grams; black titanium: 61.8 grams | Natural titanium: 63.0 grams; black titanium: 63.1 grams |
| Dual-frequency GPS supporting GPS, GLONASS, Galileo, QZSS, and BeiDou | Dual-frequency GPS supporting GPS, Galileo, QZSS, and BeiDou |
| Now discontinued | Starts at $799 |
Is It Worth Upgrading From Ultra 2 to Ultra 4?
Most Apple Watch Ultra 2 owners should keep their watch if its battery still covers their usual days and workouts. It supports watchOS 27 and Siri AI, and continues to get new features through software updates.
The new Health Sensing System is the strongest reason to upgrade an Ultra 4. It measures heart rate every five seconds throughout the day and collects HRV data more frequently, enabling Recovery HRV, daytime Vitals, and the Readiness app. If you will use those insights to adjust your training or better understand changes in your daily condition, the Apple Watch Ultra 4 offers a substantially improved health-tracking experience.
The S11 chip strengthens the case to upgrade. Alongside twice the memory, it enables more accurate all-day step counts, a Steps complication, and Audio Intelligence. Sound Recognition can alert you to important surrounding sounds on your wrist, while music recognition can identify songs automatically.
Satellite connectivity and longer battery life add further reasons to switch, especially if you spend time beyond cellular coverage or record long workouts. Apple's ratings increase from 36 to 50 hours of normal use and from 12 to 18 hours of standard outdoor workout tracking. The slightly larger display and faster charging are welcome improvements, but the new sensing and chip-enabled features make the bigger difference.
Should You Buy an Ultra 2 or Ultra 4?
For most people buying an Apple Watch Ultra now, future-proofing is the strongest reason to choose the latest model. Its S11 chip, 4GB of RAM, and Health Sensing System already enable Readiness, more detailed recovery metrics, and Audio Intelligence features. Live Rewind and Siri Recap are due later in 2026. If you plan to keep your watch for several years through successive software updates, that newer hardware makes the $799 model easier to justify.
The Apple Watch Ultra 2 remains a credible value option at a substantial discount. At Apple's current $589 refurbished price, it costs $210 less than a new Ultra 4 while retaining the same design and core features. Choose it if those existing capabilities meet your needs and you are comfortable passing up the Ultra 4's hardware-exclusive features.
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