vs
7.4Display9.3
6.4Battery life4.5
7.6Smart features8.0
8.4Build & durability9.4
Dimensions
Size comparison
Active 2Watch Ultra 4
| Active 2 | Watch Ultra 4 | Difference | |
|---|---|---|---|
| Height | 43.9 mm | 49 mm | −5.1 mm |
| Width | 43.9 mm | 44 mm | −0.1 mm |
| Thickness | 9.9 mm | 12 mm | −2.1 mm |
| Weight | 32 g | 63 g | −31 g |
Drawn to the same scale from the official dimensions (front and side).
Why is Active 2 better than Watch Ultra 4?
- Battery life (smartwatch mode)10 days vs 2.1 days4.8×
- Weight31.6 g vs 63 g+99%
- Voice assistantYes · Watch Ultra 4: Yes
- Thickness9.9 mm vs 12 mm+21%
- Resolution (width)466 px vs 422 px+10%
- Pixel density353 ppi vs 326 ppi+8%
Why is Watch Ultra 4 better than Active 2?
- Water resistance5 ATM vs 10 ATM2×
- Screen size1.32″ vs 1.98″+50%
- Battery capacity270 mAh vs 631 mAh2.3×
Specifications
Side by side
| Design & durability | ||
| Case size | — | 49 mm |
| Weight | 31.6 g | 63 g |
| Thickness | 9.9 mm | 12 mm |
| Height | 43.9 mm | 49 mm |
| Width | 43.9 mm | 44 mm |
| Case material | Stainless steel | Titanium |
| Sapphire crystal | Yes | Yes |
| Lens / cover glass | Premium version: Sapphire glass | Sapphire crystal |
| Water resistance | 5 ATM | 10 ATM |
| Ingress protection | — | IP6X |
| Water rating (maker) | — | 100 m |
| Military-grade (MIL-STD-810) | — | Yes |
| Colours | — | Natural, Black |
| Display | ||
| Screen size | 1.32″ | 1.98″ |
| Display technology | AMOLED | OLED |
| Panel | AMOLED | Retina LTPO3 OLED |
| AMOLED / OLED display | Yes | Yes |
| Always-on display | — | Yes |
| Touchscreen | Yes | Yes |
| Resolution (width) | 466 px | 422 px |
| Resolution (height) | 466 px | 514 px |
| Pixel density | 353 ppi | 326 ppi |
| Peak brightness | — | 3,000 nits |
| LTPO display | — | Yes |
| Refresh rate | — | 60 Hz |
| Battery | ||
| Battery life (smartwatch mode) | 10 days | 2.1 days |
| Battery saver mode | 19 days | — |
| GPS battery life | 21 h | — |
| Battery life (hours) | — | 50 h |
| Battery capacity | 270 mAh | 631 mAh |
| Battery type | — | Li-Ion |
| Wireless charging | — | Yes |
| Charging | Magnetic charging base | — |
| Charged in 30 min | — | 53% |
| Health sensors | ||
| Optical heart rate | — | Yes |
| Blood oxygen (SpO2) | — | Yes |
| ECG | — | Yes |
| Skin temperature | — | Yes |
| Temperature sensor | — | Yes |
| HRV tracking | — | Yes |
| Sleep tracking | Yes | Yes |
| Sensors | — | 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 |
| Barometric altimeter | — | Yes |
| Compass | — | Yes |
| Multisport / triathlon mode | — | Yes |
| Sport profiles | 160 | — |
| Dive mode | — | Yes |
| Connectivity | ||
| NFC payments | Yes | Yes |
| LTE (cellular) | — | Yes |
| eSIM | — | Yes |
| Satellite messaging | — | Yes |
| Wi-Fi | — | Wi-Fi 4 |
| Bluetooth | 5.2 | 5.3 |
| Ultra Wideband | — | Yes |
| Smart features | ||
| Calls from the wrist | Yes | Yes |
| Speaker | Yes | Yes |
| Microphone | Yes | Yes |
| Voice assistant | Yes | Yes |
| Music on the watch | — | Yes |
| Storage | — | 64 GB |
| Platform | ||
| Operating system | — | watchOS 27 |
| Platform | Proprietary | watchOS |
| Works with | iOS, Android | iOS |
| Chipset | — | Apple S11 |
