Amazfit T-Rex Ultra vs Garmin Venu 3
Both smartwatches compete at the $450 price point with distinct philosophies. Amazfit T-Rex Ultra prioritizes durability and battery longevity, delivering an impressive 20-day battery life and robust 10 ATM water resistance suitable for free-diving. Garmin Venu 3 counters with superior health monitoring capabilities, including ECG and skin temperature sensors absent from the T-Rex Ultra, plus NFC and Wi-Fi connectivity for broader functionality. Display quality matches identically at 454x454 AMOLED resolution. The T-Rex Ultra weighs nearly double (89g vs 47g), which some find imposing. Venu 3's lighter profile and advanced health suite appeal to serious fitness enthusiasts, while T-Rex Ultra's exceptional battery stamina and rugged construction suit adventure seekers. Choose Venu 3 for comprehensive health data and connectivity; select T-Rex Ultra if multi-week battery life and extreme durability matter most.
Full Specifications
| Spec | Amazfit T-Rex Ultra | Garmin Venu 3 |
|---|---|---|
| Software | Zepp OS 2.0 | Garmin OS |
| Body | ||
| Weight | 89 g | 47 g |
| Case material | Stainless steel bezel, fiber-reinforced polymer case | Stainless steel bezel, fiber-reinforced polymer case |
| Water resistance | 10 ATM, ISO 22810 certified for free-diving to 45m | 5 ATM |
| Health & Sensors | ||
| ECG | ||
| SpO₂ | ||
| Skin temperature | ||
| Heart rate | ||
| Sleep tracking | ||
| Battery | ||
| Battery life | Up to 20 days typical use, 80 hours GPS | Up to 14 days smartwatch mode, 26 hours GPS |
| Display | ||
| Size | 1.39 inch | 1.4 inch |
| Type | AMOLED | AMOLED |
| Always-on display | ||
| Resolution | 454 x 454 | 454 x 454 |
| Connectivity | ||
| GPS | ||
| NFC | ||
| Wi-Fi | ||
| Cellular | ||
| Bluetooth | 5.0 | 5.0 |
Category Scores
Pros & Cons
Amazfit T-Rex Ultra
Pros
- Excellent 20-day battery life with always-on display
- Dual-band six-satellite GPS for high accuracy
- Rugged design with 15 military-grade certifications
- Free-diving rated to 45 meters
- Offline maps with route import support
Cons
- No ECG, skin temperature, or NFC payments
- No Wi-Fi or cellular connectivity
- Zepp OS app ecosystem is limited
- Heavier than most smartwatches at 89g
- No third-party app store
Garmin Venu 3
Pros
- Outstanding 14-day battery life with AMOLED display
- Comprehensive health tracking including ECG and skin temperature
- Built-in speaker and microphone for calls
- Advanced sleep coaching and nap detection
- Multi-band GNSS for accurate GPS tracking
Cons
- No third-party app ecosystem like Wear OS
- Limited smartwatch features compared to Apple/Samsung
- No cellular connectivity option
- Garmin Pay supports limited banks
Related Comparisons
Explore more in smartwatches, see all Amazfit products or all Garmin products. View full details for the Amazfit T-Rex Ultra or the Garmin Venu 3.