vs
8.8Display9.3
9.2Health tracking8.2
8.0Sports & outdoor3.1
9.0Smart features7.9
5.7Build & durability9.4
Dimensions
Size comparison
Watch Series 12 AluminumWatch Ultra 4
| Watch Series 12 Aluminum | Watch Ultra 4 | Difference | |
|---|---|---|---|
| Height | 46 mm | 49 mm | −3 mm |
| Width | 40 mm | 44 mm | −4 mm |
| Thickness | 9.7 mm | 12 mm | −2.3 mm |
| Weight | 40 g | 63 g | −24 g |
Drawn to the same scale from the official dimensions (front and side).
Why is Watch Series 12 Aluminum better than Watch Ultra 4?
- Weight39.5 g vs 63 g+59%
- Charged in 30 min80% vs 53%+51%
- Thickness9.7 mm vs 12 mm+24%
Why is Watch Ultra 4 better than Watch Series 12 Aluminum?
- Water resistance5 ATM vs 10 ATM2×
- Peak brightness2,000 nits vs 3,000 nits+50%
- Battery capacity377 mAh vs 631 mAh+67%
Specifications
Side by side
| Design & durability | ||
| Case size | 46 mm | 49 mm |
| Weight | 39.5 g | 63 g |
| Thickness | 9.7 mm | 12 mm |
| Height | 46 mm | 49 mm |
| Width | 40 mm | 44 mm |
| Case material | — | Titanium |
| Sapphire crystal | — | Yes |
| Lens / cover glass | Ceramic Shield 2 | Sapphire crystal |
| Water resistance | 5 ATM | 10 ATM |
| Ingress protection | IP6X | IP6X |
| Water rating (maker) | — | 100 m |
| Military-grade (MIL-STD-810) | — | Yes |
| Colours | Dark Bronze, Light Gold, Black, Space Gray | Natural, Black |
| Display | ||
| Screen size | 1.96″ | 1.98″ |
| Display technology | OLED | OLED |
| Panel | Retina LTPO3 OLED | Retina LTPO3 OLED |
| AMOLED / OLED display | Yes | Yes |
| Always-on display | — | Yes |
| Touchscreen | — | Yes |
| Resolution (width) | 416 px | 422 px |
| Resolution (height) | 496 px | 514 px |
| Pixel density | 326 ppi | 326 ppi |
| Peak brightness | 2,000 nits | 3,000 nits |
| LTPO display | Yes | Yes |
| Refresh rate | 60 Hz | 60 Hz |
| Battery | ||
| Battery life (smartwatch mode) | — | 2.1 days |
| Battery life (hours) | — | 50 h |
| Battery capacity | 377 mAh | 631 mAh |
| Battery type | Li-Ion | Li-Ion |
| Wireless charging | Yes | Yes |
| Charged in 30 min | 80% | 53% |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| ECG | Yes | Yes |
| Skin temperature | Yes | Yes |
| Temperature sensor | Yes | Yes |
| HRV tracking | — | Yes |
| Sleep tracking | — | Yes |
| Sensors | Accelerometer, gyro, always-on heart rate, barometer, always-on altimeter, compass, SpO2, VO2max, temperature (body), temperature (water) | Accelerometer, gyro, always-on heart rate, barometer, always-on altimeter (-500m to 9000m), compass, SpO2, VO2max, temperature (body), temperature (water) |
| Sports & navigation | ||
| Built-in GPS | Yes | Yes |
| Dual-band GPS | — | Yes |
| Satellite systems | GLONASS, GALILEO, BDS, QZSS | GLONASS, GALILEO, BDS, QZSS |
| Barometric altimeter | Yes | Yes |
| Compass | Yes | Yes |
| Multisport / triathlon mode | — | Yes |
| Dive mode | — | Yes |
| Connectivity | ||
| NFC payments | Yes | Yes |
| LTE (cellular) | Yes | Yes |
| eSIM | Yes | Yes |
| Satellite messaging | — | Yes |
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| Bluetooth | 5.3 | 5.3 |
| Ultra Wideband | Yes | Yes |
| Smart features | ||
| Calls from the wrist | — | Yes |
| Speaker | Yes | Yes |
| Microphone | — | Yes |
| Voice assistant | — | Yes |
| Music on the watch | — | Yes |
| Storage | 64 GB | 64 GB |
| Platform | ||
| Operating system | watchOS 27 | watchOS 27 |
| Platform | watchOS | watchOS |
| Works with | — | iOS |
| Chipset | Apple S11 | Apple S11 |
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