Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsChoose Apple Watch Series 12 for everyday smartwatch and health features in a smaller, less expensive package. Choose Apple Watch Ultra 4 if you need its longer rated battery life, larger rugged case, or water rating for activities such as recreational scuba diving. Both share Apple’s new Health Sensing System, so the Ultra is not established as the better everyday health tracker.
What’s different between Series 12 and Ultra 4?
| Category | Apple Watch Series 12 | Apple Watch Ultra 4 |
|---|---|---|
| Case sizes | 42mm or 46mm | 49mm |
| Case materials | Multiple materials; exact choices vary by configuration and region | Titanium |
| Everyday battery rating | Up to 24 hours | Up to 50 hours |
| Low Power Mode battery rating | Up to 38 hours | Up to 84 hours |
| Water rating and stated use | 50 meters; shallow-water activities such as swimming | 100 meters; recreational scuba diving to 40 meters with a compatible third-party app |
| U.S. starting price reported September 18, 2026 | $399 | $799 |
Apple’s battery figures are “up to” ratings from specified test workloads, not guaranteed results. Actual battery life varies with use. Apple describes Series 12 testing with time checks, notifications, app use, one workout and sleep tracking; Ultra 4’s test includes time checks, notifications, app use, workouts and sleep tracking. The company also rates Ultra 4 for up to 45 hours in Max Extended Workout mode for outdoor runs, walks and hikes; some metrics and alerts are omitted in those modes, and results depend on test conditions. See Apple’s comparison page and Ultra 4 announcement for details.
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The $399 and $799 figures are U.S. starting prices reported by MacRumors on September 18, 2026, not a guarantee of current pricing. Compare the exact size, material and GPS or cellular configuration, and check live listings in your region.
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Which one should you buy?
Choose Series 12 for daily use and shared health features
- You mainly want notifications, workouts and health features in an everyday smartwatch.
- You prefer a smaller choice of case sizes: 42mm or 46mm, compared with Ultra 4’s 49mm case.
- You want the lower reported U.S. starting price.
- You want the new Health Sensing System and readiness-related features without paying for Ultra 4’s larger, more outdoor-focused design.
Apple says both models include its new Health Sensing System, including higher-frequency heart-rate and HRV measurement and a readiness score. The available product information does not establish that Ultra 4 offers substantially better everyday health tracking.
#1 Best Overall
![Apple Watch Series 11 [GPS 46mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - M/L. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/416RQ0rtsUL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Choose Ultra 4 for longer outings and specific water activities
- You value a longer battery rating for trips, outdoor sessions or fewer charging stops.
- You want a larger titanium case and features aimed at outdoor workouts.
- You plan recreational scuba diving to 40 meters and will use a compatible third-party app.
Ultra 4’s larger 49mm case is a trade-off as well as a feature: the smaller listed Series 12 sizes may be a better place to start if you have a small wrist or are concerned about bulk. Comfort is personal, so the specifications alone cannot establish which case will fit you best.
What do the water ratings allow?
Apple rates Series models for water resistance to 50 meters under ISO 22810:2010 and describes them as suitable for shallow-water activities such as swimming. Series 10 and later can snorkel to 6 meters. Apple says Series models are not for scuba diving or high-velocity water sports.
Rank #2
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Rose Gold Aluminum Case with Light Blush Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31caPPnRysL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Apple rates Ultra models to 100 meters and permits recreational scuba diving to 40 meters with a compatible third-party app—not below 40 meters. Water resistance is not permanent and can diminish over time. Read Apple’s water-resistance guidance before choosing a watch for water use.
Check iPhone compatibility before you choose
Apple lists iPhone 11 or later running iOS 27 or later as the requirement for both models. Some features, apps and services may vary by region or language or require specific hardware and software. Confirm the requirements for the features you plan to use on Apple’s comparison page.
Rank #3
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Jet Black Aluminum Case with Black Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/41s72HIk5TL._SL160_.jpg)
- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
What Apple says about heart-rate accuracy
Apple says its new heart-rate sensing was evaluated in a study of more than 1,000 participants and showed the highest heart-rate accuracy across the devices it compared. That is Apple’s account of its own study, not independent proof or a clinical conclusion. Apple vice president of Health and Fitness Sumbul Desai, M.D., described the company’s approach this way: “At Apple, we believe technology can empower everyone with actionable, science-based insights built with privacy at the core.” The statement is Apple’s framing, not evidence of clinical efficacy; see its Series 12 announcement.
Quick Recap
Rank #4
![Apple Watch Ultra 3 [GPS + Cellular 49mm] Running & Multisport Smartwatch w/Rugged Titanium Case w/Blue/Bright Blue Trail Loop - M/L. Satellite Communications, Advanced Health & Fitness Tracking](https://m.media-amazon.com/images/I/51SKumOyv8L._SL160_.jpg)
- RUGGED AND READY TO GO—The ultimate sports and adventure smartwatch is built to last with an extremely tough titanium case and a strong sapphire crystal display. Water resistant up to 100m—it’s great for swimmers, divers, and fans of high-speed water sports.*
- A FULL-FEATURED HEALTH TRACKER—Ultra 3 can take an ECG* and check your heart rhythm for signs of AFib—right from your wrist. The smartwatch sends alerts for possible hypertension,* an irregular heart rhythm,* or an unusually high or low heart rate. You can view your overnight health tracking metrics with the Vitals app,* track your sleep score, and take readings of your blood oxygen.*
- ULTIMATE RUNNING AND WORKOUT COMPANION—A superior fitness tracker for marathoners, triathletes, mountain bikers, backcountry hikers, and mountain climbers, Ultra 3 provides precision dual-frequency GPS, Pacer, Heart Rate Zones, Custom Workouts, running power, Workout Buddy powered by Apple Intelligence from your nearby iPhone,* training load, and more.
- KEEP HELP CLOSE AT HAND—Ultra 3 is a smartwatch that can detect a hard fall or severe car crash* and automatically help connect you to emergency services and notify your emergency contacts. Check In can automatically notify a loved one when you’ve arrived at your destination.
- MULTIDAY BATTERY LIFE—Ultra 3 is a smartwatch that’s engineered to give you even longer battery life. It’s perfect for trail runners—with up to 42 hours of normal use and up to 72 hours in Low Power Mode.* Track a workout with full GPS and heart rate monitoring for up to 20 hours in Low Power Mode.*
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