The Apple Watch Series 12 is now available for pre-order, and unlike last year's model, it brings a substantial list of changes over its predecessor. Here's everything that's new.
Last year, the Series 11 introduced just four changes over the Series 10, making it perhaps the smallest generational upgrade in the device's history. The Series 12 is a far more meaningful refresh, even though it essentially retains the same design for a third consecutive year.
It launches on Friday, September 18, at the same $399 starting price as the Series 11, which Apple has now discontinued. This guide lists all of the differences between the Series 11 and Series 12 models to help you understand the changes:
| Apple Watch Series 11 | Apple Watch Series 12 |
|---|---|
| S10 chip (2024) | S11 chip (2026) |
| 2GB RAM | 4GB RAM |
| Electrical heart sensor | "Health Sensing System" with second-generation electrical heart sensor |
| Third-generation optical heart sensor | Fourth-generation, always-on optical heart sensor |
| Heart rate tracking | High-frequency background heart rate tracking (every five seconds) |
| HRV | Recovery HRV and overall HRV (measured up to 24x more often) |
| Vitals app with heart rate, respiratory rate, wrist temperature, and sleep duration | Vitals app with heart rate, respiratory rate, wrist temperature, sleep duration, and HRV, plus daytime vitals view |
| Readiness app | |
| More accurate step tracking | |
| Steps complication | |
| Audio Intelligence (Live Rewind, Siri Recap, Sound Recognition, and Shazam) | |
| Ion-X glass with 2x scratch resistance (aluminum models) | Ceramic Shield 2, 60% tougher than Ion-X (aluminum models) |
| Metal and sapphire crystal back | Aluminum or titanium and zirconia back |
| Aluminum or titanium case | Aluminum, titanium, or ceramic case |
| Aluminum: Jet Black, Rose Gold, Silver, and Space Gray | Aluminum: Dark Bronze, Light Gold, Black, and Space Gray |
| Titanium: Slate, Gold, and Natural | Titanium: Radiant Gold and Natural |
| Ceramic: Pearl White and Night Blue | |
| Hermès: Silver titanium | Hermès: Silver and Radiant Gold titanium |
| 15 minutes of charging for up to 8 hours of normal use | 15 minutes of charging for up to 12 hours of normal use |
| 5 minutes of charging for up to 8 hours of sleep tracking | 5 minutes of charging for up to 10 hours of sleep tracking |
| Now discontinued | From $399 |
The new ceramic case marks the first ceramic Apple Watch since the Series 5 Edition in 2019, but it is slightly larger than the other models and weighs up to 52.9 grams in its 46mm Night Blue configuration. Even the aluminum and titanium models are now 1mm wider and around 2 grams heavier than their predecessors.
At the same time, the display appears to have shrunk slightly, even though its resolution is unchanged. Apple lists the 46mm Series 12 with 1,196 sq mm of display area, 2% less than the 1,220 sq mm of the Series 11, while the 42mm model drops 1.9% from 989 sq mm to 970 sq mm.
A marginally smaller screen in a wider case means thicker borders, and Apple also appears to have pulled the case back slightly around a larger front glass, which could make them look even more prominent. The Series 10 went through a similar change in 2024, when its visible aluminum edge shrank compared to the Series 9 but its overall bezel, including the black border under the glass, actually grew. The shift is less dramatic this time around, since the Series 12 keeps the same basic case design. Here's how the two generations compare in size, weight, and display area:
| 46mm | Apple Watch Series 11 | Apple Watch Series 12 |
|---|---|---|
| Dimensions | 46mm x 39mm x 9.7mm | 46mm x 40mm x 9.7mm |
| Display area | 1,220 sq mm | 1,196 sq mm |
| Aluminum (GPS) | 37.8 grams | 39.5 grams |
| Aluminum (Cellular) | 36.9 grams | 38.6 grams |
| Titanium | 43.1 grams | 44.9 grams |
| 42mm | Apple Watch Series 11 | Apple Watch Series 12 |
|---|---|---|
| Dimensions | 42mm x 36mm x 9.7mm | 42mm x 37mm x 9.7mm |
| Display area | 989 sq mm | 970 sq mm |
| Aluminum (GPS) | 30.3 grams | 32.2 grams |
| Aluminum (Cellular) | 29.7 grams | 31.5 grams |
| Titanium | 34.6 grams | 36.5 grams |
The new ceramic models, which have no Series 11 equivalent, are larger and considerably heavier still:
| Ceramic | 46mm | 42mm |
|---|---|---|
| Dimensions | 47mm x 41mm x 9.85mm | 43mm x 37mm x 9.85mm |
| Pearl White | 51.3 grams | 41.7 grams |
| Night Blue | 52.9 grams | 42.8 grams |
The most significant upgrade between the two devices is the new Health Sensing System. It uses a larger electrode surface for better skin contact during ECG readings, redesigned photodiodes laid out in a ring for more efficient light capture, and bigger, more power-efficient green LEDs. The result is that the Series 12 measures heart rate every five seconds throughout the day, 60 times more frequently than before, and samples HRV up to 24 times more often. Apple claims this gives the Series 12 the most accurate heart rate sensing of any wearable.
That higher-frequency data powers several new he... Click here to read rest of article
Article Link: Apple Watch Series 11 vs. Series 12 Buyer's Guide: 25+ Upgrades Compared
