Amazfit T-Rex 3 vs Garmin Instinct 3 AMOLED 45mm
Which one should you buy?
Who leads where?
- Battery and ChargingAmazfit T-Rex 3
Wins are counted from the official values in the table below; the BUY / CONSIDER / WAIT call comes from each product's own decision box. We do not predict prices.
 AmazfitAmazfit T-Rex 3No reviews yet |  GarminGarmin Instinct 3 AMOLED 45mmNo reviews yet | |
|---|---|---|
| Key Differences | ||
| Case Size | 48.5 mm | 45 mm |
| Battery Life | up to 648 hours | up to 168 hours |
| Water Resistance | 10 ATM | 10 ATM |
| Health Sensors and Features | ||
| Heart Rate Sensor | Yes | Yes |
| SpO2 Sensor | Yes | Yes |
| Skin Temperature Sensor | No data | Yes |
| Sleep Tracking | No data | Yes |
| Crash Detection | No data | Yes |
| Display | ||
| Size | 1.5" | 1.2" |
| Panel | AMOLED | AMOLED |
| Resolution | 480x480 | 390x390 |
| Always-On Display | No data | Yes |
| Case | ||
| Case Size | 48.5 mm | 45 mm |
| Case Thickness | 13.75 mm | 14.9 mm |
| Weight | 68.3 g | 53 g |
| Case Material | Stainless steel and polymer | Fibre-reinforced polymer |
| Front Glass | Corning Gorilla Glass | Chemically strengthened glass |
| Strap Width | 22 mm | 22 mm |
| Positioning and GNSS | ||
| GNSS Receiver | Yes | Yes |
| Dual-Band GNSS | Yes | Yes |
| GNSS Systems | No data | GPS, GLONASS, Galileo, QZSS, BeiDou |
| Battery and Charging | ||
| The figure the maker states | up to 648 hours | up to 168 hours |
| What that figure measures | In typical use | With always-on display on |
| Capacity | 700 mAh | No data |
| Charging Type | Magnetic charging | Garmin proprietary charging cable |
| Water and Dust Resistance | ||
| Water Resistance | 10 ATM | 10 ATM |
| Rated Depth | 45 m | No data |
| Performance | ||
| Storage | No data | 4 GB |
| Connectivity | ||
| Bluetooth | 5.2 | No data |
| Microphone | Yes | No data |
| Software | ||
| Phone Compatibility | Android 7.0 and above, iOS 14.0 and above | iPhone and Android |
Amazfit T-Rex 3 leads on 2 of 3 compared specs.
This table is based on manufacturers official specifications. Winning on paper does not always mean a difference in everyday use.