vs
9.3Display9.3
3.4Battery life4.8
8.6Health tracking8.2
3.1Sports & outdoor3.1
7.9Smart features7.9
9.6Build & durability9.4
Dimensions
Size comparison
Watch Ultra 3Watch Ultra 4
| Watch Ultra 3 | Watch Ultra 4 | Difference | |
|---|---|---|---|
| Height | 49 mm | 49 mm | = |
| Width | 44 mm | 44 mm | = |
| Thickness | 12 mm | 12 mm | = |
| Weight | 62 g | 63 g | −1 g |
Drawn to the same scale from the official dimensions (front and side).
Why is Watch Ultra 3 better than Watch Ultra 4?
- Weight61.6 g vs 63 g+2%
Why is Watch Ultra 4 better than Watch Ultra 3?
- Battery life (smartwatch mode)1.5 days vs 2.1 days+40%
- Battery life (hours)36 h vs 50 h+39%
- Battery capacity599 mAh vs 631 mAh+5%
Specifications
Side by side
| Design & durability | ||
| Case size | 49 mm | 49 mm |
| Weight | 61.6 g | 63 g |
| Thickness | 12 mm | 12 mm |
| Height | 49 mm | 49 mm |
| Width | 44 mm | 44 mm |
| Case material | Titanium | Titanium |
| Sapphire crystal | Yes | Yes |
| Lens / cover glass | Sapphire crystal glass | Sapphire crystal |
| Water resistance | 10 ATM | 10 ATM |
| Ingress protection | IP6X | IP6X |
| Water rating (maker) | 100 m | 100 m |
| Military-grade (MIL-STD-810) | Yes | Yes |
| Colours | Natural, Black | Natural, Black |
| Display | ||
| Screen size | 1.98″ | 1.98″ |
| Display technology | OLED | OLED |
| Panel | Retina LTPO3 OLED | Retina LTPO3 OLED |
| AMOLED / OLED display | Yes | Yes |
| Always-on display | Yes | Yes |
| Touchscreen | Yes | Yes |
| Resolution (width) | 422 px | 422 px |
| Resolution (height) | 514 px | 514 px |
| Pixel density | 326 ppi | 326 ppi |
| Peak brightness | 3,000 nits | 3,000 nits |
| LTPO display | Yes | Yes |
| Refresh rate | 60 Hz | 60 Hz |
| Battery | ||
| Battery life (smartwatch mode) | 1.5 days | 2.1 days |
| Battery life (hours) | 36 h | 50 h |
| Battery capacity | 599 mAh | 631 mAh |
| Battery type | Li-Ion | Li-Ion |
| Wireless charging | Yes | Yes |
| Charged in 30 min | 53% | 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 | Yes |
| Sensors | Accelerometer, gyro, heart rate, barometer, always-on altimeter (-500m to 9000m), 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 | Yes |
| Satellite systems | GLONASS, GALILEO, BDS, QZSS | GLONASS, GALILEO, BDS, QZSS |
| Barometric altimeter | Yes | Yes |
| Compass | Yes | Yes |
| Multisport / triathlon mode | Yes | Yes |
| Dive mode | Yes | Yes |
| Connectivity | ||
| NFC payments | Yes | Yes |
| LTE (cellular) | Yes | Yes |
| eSIM | Yes | Yes |
| Satellite messaging | Yes | 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 | Yes |
| Speaker | Yes | Yes |
| Microphone | Yes | Yes |
| Voice assistant | Yes | Yes |
| Music on the watch | Yes | Yes |
| Storage | 64 GB | 64 GB |
| Platform | ||
| Operating system | watchOS 26 | watchOS 27 |
| Platform | watchOS | watchOS |
| Works with | iOS | iOS |
| Chipset | Apple S10 | Apple S11 |
