Apple Watch Series 11 vs Apple Watch Series 12

Set an aluminum Series 11 beside an aluminum Series 12 and, colors aside, the only difference you’d see is a millimeter of extra width. Apple announced Series 11 on 9 September 2025 and Series 12 on 9 September 2026, with Series 12 in stores from 18 September 2026. Both come in 42mm and 46mm, and both started at $399.

How they compare

Spec	Apple Watch Series 11	Apple Watch Series 12
Announced	9 September 2025	9 September 2026
Sizes	42mm or 46mm	42mm or 46mm
Case materials	Aluminum or titanium	Aluminum, titanium or ceramic
46mm aluminum case	46 × 39 × 9.7mm; 37.8 g GPS	46 × 40 × 9.7mm; 39.5 g GPS
Aluminum front glass	Ion-X	Ceramic Shield 2
Display	LTPO3, up to 2,000 nits, 326 ppi	Same
Chip and storage	S10; 64GB	S11; 64GB
Heart sensors	Third-generation optical, plus electrical	Health Sensing System
Readiness score	No	Yes
Normal use	Up to 24 hours	Up to 24 hours
Low Power Mode	Up to 38 hours	Up to 38 hours
Outdoor workout	Not published	Up to 10 hours
15-minute charge	About 8 hours of normal use	Up to 12 hours of normal use
GPS	L1	Precision L1
iPhone needed	iPhone 11 or later; iOS 26 at launch	iPhone 11 or later; iOS 27
US launch price	$399	$399

The Health Sensing System is the real upgrade

Series 12 runs on S11, which Apple calls its most powerful wearable chip, still with a 4-core Neural Engine and 64GB of storage. The bigger change sits next to it: the Health Sensing System, new optical and electrical heart hardware. Apple says Series 12 takes your heart rate in the background every five seconds and samples heart rate variability up to 24 times more often than the previous Series.

Those readings feed the readiness score, a daily 0–10 number labeled Recover, Pace Yourself, Ready or Go For It. Sleep score and sleep apnea notifications carry over from Series 11 with the same kind of regional limits, and ECG is still the single-lead app that Series watches have and SE models don’t.

Series 11 isn’t bare. Its S10 chip also has a 4-core Neural Engine, and it pairs a third-generation optical heart sensor with an electrical one. It has hypertension notifications, with Apple’s limits: not for anyone under 22, anyone already diagnosed, or anyone pregnant. It tracks sleep stages, gives you a Sleep score and can flag possible sleep apnea. What it lacks is readiness, Audio Intelligence and the flashlight Series 12 adds to its safety features, and none of that is coming in an update: the Health Sensing System is hardware.

Audio Intelligence on S11 includes Live Rewind and Siri Recap, both late-2026 betas that start in English, and Apple says Siri AI on the watch won’t reach the European Union right away. Workout Buddy can run on Series 12 when your iPhone isn’t with you, in English and Spanish, though the full version needs an iPhone that supports Apple Intelligence. Health Age and the Longevity tab in the Health app are due later in 2026, so the launch-day Health app isn’t the finished one.

Ceramic Shield 2, and a ceramic case

The aluminum models are where the glass changed. Series 11 aluminum uses Ion-X with a ceramic coating that Apple says makes it twice as scratch resistant as Series 10’s Ion-X. Series 12 aluminum uses Ceramic Shield 2, which Apple says is tougher than any smartwatch glass and 60 percent tougher than Series 11’s Ion-X. Titanium models of both, and the new ceramic Series 12, use sapphire instead, so a titanium buyer isn’t getting the new glass.

The cases grew a millimeter wider. Series 11 measures 42 × 36 × 9.7mm or 46 × 39 × 9.7mm; Series 12 measures 42 × 37 × 9.7mm or 46 × 40 × 9.7mm. Ceramic Series 12 cases are sold as 42mm and 46mm but measure 43 × 37 × 9.85mm and 47 × 41 × 9.85mm. Wrist fit is unchanged: 130 to 200mm for the smaller case, 140 to 245mm for the larger.

Weights rose a little. On the 46mm aluminum models, Series 11 GPS weighs 37.8 grams and cellular 36.9 grams, while Series 12 GPS weighs 39.5 grams and cellular 38.6 grams; both years, Apple lists the GPS model as the heavier one. Ceramic is heavier again, with the 46mm-class night blue case at 52.9 grams. None of these weights include the band.

The colors changed too. Series 11 aluminum came in rose gold, silver, space gray and jet black, with gold, natural and slate titanium. Series 12 aluminum comes in dark bronze, black, light gold and space gray, with radiant gold and natural titanium, pearl white and night blue ceramic, and a separate Hermès collection. There was no ceramic Series 11.

Battery: the same day, faster top-ups

Both are rated for up to 24 hours of normal use and 38 in Low Power Mode, and both reach about 80 percent in about 30 minutes on the Magnetic Fast Charger to USB-C. If your Series 11 runs out around bedtime, Series 12 won’t fix that.

Short charges are where they differ. Fifteen minutes gives about 8 hours of normal use on Series 11 and up to 12 hours on Series 12, and five minutes covers about 8 hours of sleep tracking on Series 11 against up to 10 on Series 12. If you top up while you shower, Series 12 is the better partner; if you charge overnight, it makes no difference.

Series 12 also gets an outdoor-workout rating of up to 10 hours, which Apple says is 25 percent more than the previous model, based on an outdoor run with heart rate on and no iPhone nearby. Apple doesn’t give Series 11 a standalone workout figure, so that 25 percent is Apple’s comparison rather than a Series 11 number you can check. It’s also a long way from an Ultra’s 45-hour Max Extended Workout, a mode Series 12 doesn’t have.

What stayed the same

Most of what you use every day is unchanged. Both have an Always-On LTPO3 screen that peaks at 2,000 nits and dims to 1 nit, at the same 326 ppi and the same resolution: 374 × 446 on the 42mm and 416 × 496 on the 46mm. Both have 64GB of storage and get watchOS 27, which needs an iPhone 11 or later on iOS 27.

Neither has dual-frequency GPS. Series 11 has L1 GPS and Series 12 precision L1, both with GLONASS, Galileo, QZSS and BeiDou; “precision” doesn’t make it dual-frequency. Both are water resistant to 50 meters for swimming, with IP6X dust resistance and a depth gauge to 6 meters plus a water-temperature sensor. Series 12’s rating adds snorkeling to 6 meters, which still isn’t an Ultra’s 40-meter EN 13319 dive rating. Neither has an Action Button, a siren or satellite.

Cellular models of both have 5G RedCap and LTE: A3335 and A3337 for Series 11, A3582 and A3587 for Series 12. Series 11 is rated to work from 0 to 35 degrees Celsius and up to 3,000 meters of altitude. Apple doesn’t list a range for Series 12, so don’t count on an Ultra-style rating down to minus 20 degrees.

Both track running form (stride length, ground contact time and vertical oscillation) and include offline maps, U.S. topographic maps and curated hikes in 63 national parks. Running power stays an Ultra feature; Series 11’s running metrics don’t include it.

Price

Both aluminum GPS models started at $399 in the US, a year apart. Titanium and ceramic Series 12 models cost more, cellular is a separate model, and education pricing and bands change the total. Series 11 is now last year’s watch, so what it costs depends on who still has stock. This comparison was last checked against Apple’s figures on 22 September 2026; prices change, so look at apple.com before you buy.