vs
8.3Display8.0
6.9Battery life7.2
4.9Health tracking4.9
9.4Sports & outdoor6.0
8.4Build & durability6.3
Dimensions
Size comparison
T-Rex 3T-Rex Ultra
| T-Rex 3 | T-Rex Ultra | Difference | |
|---|---|---|---|
| Height | 48.5 mm | 47.3 mm | +1.2 mm |
| Width | 48.5 mm | 47.3 mm | +1.2 mm |
| Thickness | 13.8 mm | 13.4 mm | +0.3 mm |
| Weight | 68 g | 89 g | −21 g |
Drawn to the same scale from the official dimensions (front and side).
Why is T-Rex 3 better than T-Rex Ultra?
- Battery life (smartwatch mode)27 days vs 20 days+35%
- Weight68.3 g vs 89 g+30%
- Screen size1.5″ vs 1.39″+8%
- Battery saver mode40 days vs 25 days+60%
- GPS battery life (dual-band)42 h vs 28 h+50%
- Battery capacity700 mAh vs 500 mAh+40%
- Resolution (width)480 px vs 454 px+6%
Why is T-Rex Ultra better than T-Rex 3?
- GPS battery life28 h vs 46 h+64%
- Thickness13.8 mm vs 13.4 mm+2%
Specifications
Side by side
| Design & durability | ||
| Case size | 48 mm | — |
| Weight | 68.3 g | 89 g |
| Thickness | 13.8 mm | 13.4 mm |
| Height | 48.5 mm | 47.3 mm |
| Width | 48.5 mm | 47.3 mm |
| Case material | Stainless steel | Plastic / polymer |
| Lens / cover glass | Gorilla Glass | — |
| Water resistance | 10 ATM | 10 ATM |
| Display | ||
| Screen size | 1.5″ | 1.39″ |
| Display technology | AMOLED | AMOLED |
| Panel | AMOLED | AMOLED |
| AMOLED / OLED display | Yes | Yes |
| Touchscreen | Yes | Yes |
| Resolution (width) | 480 px | 454 px |
| Resolution (height) | 480 px | 454 px |
| Pixel density | 322 ppi | 326 ppi |
| Battery | ||
| Battery life (smartwatch mode) | 27 days | 20 days |
| Battery saver mode | 40 days | 25 days |
| GPS battery life | 28 h | 46 h |
| GPS battery life (dual-band) | 42 h | 28 h |
| Battery capacity | 700 mAh | 500 mAh |
| Charging | Magnetic charging base | Magnetic charging base |
| Health sensors | ||
| Optical heart rate | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| Temperature sensor | Yes | — |
| Sleep tracking | Yes | — |
| Sports & navigation | ||
| Built-in GPS | Yes | Yes |
| Dual-band GPS | Yes | Yes |
| Offline maps | Yes | — |
| Barometric altimeter | Yes | Yes |
| Compass | Yes | Yes |
| Sport profiles | 170 | — |
| Connectivity | ||
| Wi-Fi | Wi-Fi 4 | Wi-Fi 4 |
| Bluetooth | 5.2 | 5 |
| Smart features | ||
| Calls from the wrist | Yes | — |
| Microphone | Yes | — |
| Voice assistant | Yes | — |
| Music on the watch | Yes | — |
| Platform | ||
| Operating system | — | Zepp OS |
| Platform | Proprietary | Proprietary |
| Works with | Android, iOS | iOS, Android |
