vs
9.3Display8.2
8.0Health tracking4.9
3.1Sports & outdoor8.0
8.0Smart features4.9
Dimensions
Size comparison
Watch Ultra 4Watch Buds 2
| Watch Ultra 4 | Watch Buds 2 | Difference | |
|---|---|---|---|
| Height | 49 mm | 47 mm | +2 mm |
| Width | 44 mm | 47 mm | −3 mm |
| Thickness | 12 mm | 14.7 mm | −2.7 mm |
| Weight | 63 g | 54 g | +8 g |
Drawn to the same scale from the official dimensions (front and side).
Why is Watch Ultra 4 better than Watch Buds 2?
- LTE (cellular)Yes · Watch Buds 2: No
- Screen size1.98″ vs 1.5″+32%
- eSIMYes · Watch Buds 2: No
- SpeakerYes · Watch Buds 2: No
- Battery capacity631 mAh vs 410 mAh+54%
- Thickness12 mm vs 14.7 mm+22%
- Pixel density326 ppi vs 310 ppi+5%
Why is Watch Buds 2 better than Watch Ultra 4?
- Battery life (smartwatch mode)2.1 days vs 3 days+43%
- Weight63 g vs 54.5 g+16%
- Resolution (width)422 px vs 466 px+10%
Specifications
Side by side
| Design & durability | ||
| Case size | 49 mm | 47 mm |
| Weight | 63 g | 54.5 g |
| Thickness | 12 mm | 14.7 mm |
| Height | 49 mm | 47 mm |
| Width | 44 mm | 47 mm |
| Case material | Titanium | Titanium |
| Sapphire crystal | Yes | — |
| Lens / cover glass | Sapphire crystal | — |
| Strap material | — | Leder |
| Water resistance | 10 ATM | — |
| Ingress protection | IP6X | — |
| Water rating (maker) | 100 m | — |
| Military-grade (MIL-STD-810) | Yes | — |
| Colours | Natural, Black | Black, Silver |
| Display | ||
| Screen size | 1.98″ | 1.5″ |
| Display technology | OLED | AMOLED |
| Panel | Retina LTPO3 OLED | LTPO AMOLED |
| AMOLED / OLED display | Yes | Yes |
| Always-on display | Yes | — |
| Touchscreen | Yes | — |
| Resolution (width) | 422 px | 466 px |
| Resolution (height) | 514 px | 466 px |
| Pixel density | 326 ppi | 310 ppi |
| Peak brightness | 3,000 nits | 3,000 nits |
| LTPO display | Yes | Yes |
| Refresh rate | 60 Hz | 60 Hz |
| Battery | ||
| Battery life (smartwatch mode) | 2.1 days | 3 days |
| Battery life (hours) | 50 h | — |
| Battery capacity | 631 mAh | 410 mAh |
| Battery type | Li-Ion | Li-Ion |
| Wireless charging | Yes | Yes |
| Charged in 30 min | 53% | — |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| ECG | Yes | — |
| Skin temperature | Yes | — |
| Temperature sensor | Yes | — |
| HRV tracking | Yes | — |
| Sleep tracking | Yes | — |
| Sensors | Accelerometer, gyro, always-on heart rate, barometer, always-on altimeter (-500m to 9000m), compass, SpO2, VO2max, temperature (body), temperature (water) | Accelerometer, gyro, heart rate, SpO2 |
| Sports & navigation | ||
| Built-in GPS | Yes | Yes |
| Dual-band GPS | Yes | — |
| Satellite systems | GLONASS, GALILEO, BDS, QZSS | GLONASS, GALILEO, BDS |
| Barometric altimeter | Yes | Yes |
| Compass | Yes | Yes |
| Multisport / triathlon mode | Yes | — |
| Dive mode | Yes | — |
| Connectivity | ||
| NFC payments | Yes | Yes |
| LTE (cellular) | Yes | No |
| eSIM | Yes | No |
| Satellite messaging | Yes | — |
| Wi-Fi | Wi-Fi 4 | — |
| Bluetooth | 5.3 | 5.2 |
| Ultra Wideband | Yes | — |
| Smart features | ||
| Calls from the wrist | Yes | — |
| Speaker | Yes | No |
| Microphone | Yes | — |
| Voice assistant | Yes | — |
| Music on the watch | Yes | — |
| Storage | 64 GB | — |
| Platform | ||
| Operating system | watchOS 27 | HarmonyOS |
| Platform | watchOS | HarmonyOS |
| Works with | iOS | iOS, Android |
| Chipset | Apple S11 | — |
