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watchOS 27 introduces two apps on Apple Watch: a dedicated Siri app and Readiness. Apple also brings Find Devices, Find People and Find Items together in the redesigned Find My app—but that is a consolidation of existing services, not a third new service. Whether you can use each feature depends on your watch model, iPhone and region.
Which apps are new in watchOS 27?
Siri: continue conversations from your wrist
The dedicated Siri app lets you start a conversation or return to one begun on iPhone. You can also pin conversations. Apple describes Siri AI as a beta feature powered by Apple Intelligence; it is initially rolling out in English, and usage limits may apply. Read Apple’s watchOS 27 user guide for its feature details.
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Readiness: a score to help plan effort and rest
Readiness presents a score intended to help you judge when to push yourself and when to rest. Apple limits the app to Apple Watch Series 12 and Apple Watch Ultra 4. A watch that can install watchOS 27 does not necessarily support this feature.
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Find Devices, Find People and Find Items are now consolidated in Find My, with a map-centric view. Apple describes a redesign and consolidation of existing functions, rather than a new third service.
#1 Best Overall
- 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.
Which Apple Watch models support watchOS 27?
Apple lists these models as compatible with watchOS 27: Apple Watch SE 3; Series 9, 10, 11 and 12; and Ultra 2, 3 and 4. Installation also requires an iPhone 11 or later, or iPhone SE (2nd generation or later), running iOS 27, according to Apple’s watchOS 27 compatibility information.
Compatibility with the operating system is not the same as compatibility with every feature. Readiness requires Series 12 or Ultra 4. Siri AI requires an Apple Intelligence-enabled iPhone and a supported language setup. Apple says it is initially available in English and not initially available in the EU on iOS and watchOS; availability can also vary by area, language and model.
Rank #2
- 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.
Other watchOS 27 changes worth knowing
- App grid: The app grid can highlight popular and recently used apps.
- Smart Stack: A single-hand tap gesture lets you select widgets.
- Workout Buddy: Insights and use over Wi-Fi or cellular no longer require the paired iPhone to be nearby.
- Workouts: Apple says treadmill distance has been improved, and extended workout modes are intended to conserve power.
- Music recognition: Shazam can identify songs offline through the Smart Stack and Music Recognition app.
- Health: Certain additional daytime vitals and a real-time heart-rate chart are specific to Series 12 and Ultra 4. Cycle Tracking adds perimenopause and menopause support in the Health app on iPhone.
Apple’s update notes, published September 23, 2026, also include bug fixes, including a fix for an issue that could cause Apple Watch to restart unexpectedly. See About watchOS 27 Updates.
Quick Recap
Best Value
- 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.
Rank #4
- 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.*
Rank #3
- 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.*
How to tell whether the update adds the feature you want
- Check whether your watch is on Apple’s watchOS 27 compatibility list.
- For Readiness, confirm that your watch is a Series 12 or Ultra 4.
- For Siri AI, check that your paired iPhone supports Apple Intelligence and that your language and region are supported.
- Check Apple’s feature and update pages for availability details, since operating-system compatibility alone does not guarantee access to every feature.
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