Apple Watch SE 3 and Apple Watch Series 11 share core features including an Always-On display, sleep tracking, sleep score, and sleep apnea notifications. Apple lists Series 11 with a brighter display, ECG, and hypertension notifications; the right choice depends on whether those additions, case fit, and your local price are worth the difference.
SE 3 comes in 40 mm and 44 mm sizes, while Series 11 comes in 42 mm and 46 mm sizes. Compare current offers for the same size and GPS or GPS + Cellular configuration before deciding: the available research establishes Apple’s SE 3 launch price, not current prices for both watches.
At a glance
| Feature | Apple Watch SE 3 | Apple Watch Series 11 |
|---|---|---|
| Case sizes | 40 mm and 44 mm | 42 mm and 46 mm |
| Display | Always-On OLED; peak brightness up to 1,000 nits | Always-On wide-angle OLED, LTPO3; peak brightness up to 2,000 nits |
| ECG | Not listed by Apple | Listed by Apple; eligibility and regional availability apply |
| Hypertension notifications | Not listed by Apple | Listed by Apple; eligibility and regional availability apply |
| Sleep features | Sleep tracking, sleep score, and sleep apnea notifications | Sleep tracking, sleep score, and sleep apnea notifications |
| Battery estimate | Up to 18 hours normal use; up to 32 hours in Low Power Mode | Not established in the sources used for this comparison |
| U.S. price context | $249 U.S. launch starting price announced September 9, 2025 | Current price not established in the sources used here |
What does Series 11 add?
Apple’s comparison lists ECG and hypertension notifications for Series 11, but not SE 3. Series 11 also has a higher listed peak display brightness: up to 2,000 nits, compared with up to 1,000 nits for SE 3. Both have an Always-On display and Apple lists sleep tracking, sleep score, and sleep apnea notifications for both.
These are Apple’s published feature and display specifications, not results from an independent head-to-head test. Whether the brighter screen matters will depend on where and how you use the watch. Likewise, ECG or hypertension notifications are reasons to consider Series 11 only if the feature is available where you live and you meet Apple’s requirements.
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![Apple Watch SE 3 [GPS 40mm] Smartwatch with Starlight Aluminum Case with Starlight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31YiTby0pOL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for 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 get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 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.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
Price: compare current configurations
Apple announced a U.S. starting price of $249 for SE 3 at its September 9, 2025 launch. That is a dated launch price, not a live quote. The research available for this article does not establish current prices for both models across markets, so check current local listings rather than treating an old launch price or an unverified price gap as today’s comparison.
For a fair comparison, match the case size as closely as possible and compare GPS with GPS or GPS + Cellular with GPS + Cellular. Cellular service and product availability depend on the market and carrier. Bands and configuration can also affect the price.
Rank #2
![Apple Watch SE 3 [GPS 40mm] Smartwatch with Midnight Aluminum Case with Midnight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/31Gq8SToFJL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for 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 get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 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.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
Choose by features and fit
Consider SE 3 if
- You want an Always-On display and the sleep features Apple lists for both watches.
- You do not need ECG or hypertension notifications.
- One of its 40 mm or 44 mm case sizes is the more comfortable fit.
- Its current local price makes it the better value for the features you will use.
Consider Series 11 if
- You value its higher listed peak brightness or wide-angle OLED display.
- You want ECG or hypertension notifications and meet Apple’s requirements in a region where the features are available.
- One of its 42 mm or 46 mm case sizes fits you better.
- Its current local price is worthwhile for those specific additions.
Case size and band fit
Apple lists SE 3 wrist-fit ranges of 130–200 mm for the 40 mm case and 140–245 mm for the 44 mm case. Try to judge fit by your wrist and the exact band, not just the case-size number. Check Apple’s compatibility guidance or the band’s product listing before buying a replacement band; case sizes differ between the two models.
Battery and health-feature caveats
Apple’s SE 3 specifications estimate up to 18 hours of normal use and up to 32 hours in Low Power Mode. These are manufacturer estimates, not independent measurements or proof of how the watch will perform for you. Battery life varies with use and configuration; the research used here does not establish a comparable Series 11 battery result.
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Rank #3
![Apple Watch SE 3 [GPS 44mm] Smartwatch with Midnight Aluminum Case with Midnight Sport Band - M/L. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant](https://m.media-amazon.com/images/I/41IZwhp9VXL._SL160_.jpg)
- GET SMARTER HEALTH INSIGHTS—Apple Watch SE 3 is an advanced health tracker that helps you better understand your body. The smartwatch sends alerts for 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 get sleep apnea notifications.*
- A GREAT FITNESS TRACKER—SE 3 can track your workouts in a healthy number of ways—from running and strength training to simply achieving your 10K steps a day. With real-time metrics and Workout Buddy powered by Apple Intelligence from your nearby iPhone,* you’ll hit your goals like never before.
- KEEP HELP CLOSE AT HAND—SE 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.
- WOMEN’S HEALTH INSIGHTS—SE 3 has advanced sensors that track your wrist temperature while you sleep. With this smartwatch, you can log your periods and symptoms, get period predictions, and get notified of cycle deviations.*
- GREAT BATTERY LIFE AND FASTER CHARGING—Enjoy a smartwatch with all-day, 18-hour battery life* from sunup to sundown. Then charge up to twice as fast as SE 2* and get up to 8 hours of battery in just 15 minutes.*
Apple describes health and wellness features as subject to eligibility and availability, and says they are not a substitute for clinician care. ECG is intended for people 22 years old or older. Apple says hypertension notifications are not intended for people under 22, people previously diagnosed with hypertension, or pregnant people. Sleep apnea notifications are intended to detect signs of moderate to severe sleep apnea in people 18 or older who have not been diagnosed. Check Apple’s current guidance for your country and software version.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.FAQ
What is the main difference between Apple Watch SE 3 and Series 11?
Apple lists Series 11 with a brighter display, ECG, and hypertension notifications, while both models have an Always-On display, sleep tracking, sleep score, and sleep apnea notifications.
Rank #4
![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.
Does Apple Watch SE 3 have an Always-On display?
Yes. Apple’s comparison lists an Always-On display for both SE 3 and Series 11.
Can Apple Watch SE 3 take an ECG?
Apple’s comparison lists ECG for Series 11, not SE 3. ECG eligibility and availability vary; Apple says the feature is intended for people 22 years old or older.
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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →What sizes are Apple Watch SE 3 and Series 11?
SE 3 comes in 40 mm and 44 mm sizes. Series 11 comes in 42 mm and 46 mm sizes. Check case and band fit before buying.
How much does Apple Watch SE 3 cost?
Apple announced a $249 U.S. starting price at launch on September 9, 2025. That is not a current price quote; check local listings for today’s price and compare equivalent configurations.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
