Amazfit T-Rex Ultra vs Apple Watch Ultra (1st Gen)
The Verdict
Apple Watch Ultra 1st Gen and Amazfit T-Rex Ultra target different user priorities. Apple's offering includes ECG and skin temperature monitoring alongside comprehensive health tracking, cellular connectivity, NFC payments, and watchOS ecosystem integration with iPhones. Its titanium construction weighs just 61.3g with a vibrant LTPO OLED display. Battery lasts 36 hours normally or 60 hours in Low Power Mode. Conversely, Amazfit T-Rex Ultra excels in battery longevity, delivering up to 20 days on typical use and 80 hours GPS mode, making it ideal for expedition athletes. Its larger 1.39-inch AMOLED display and robust fiber-reinforced polymer construction handle extreme conditions well. SpO2 and heart rate tracking are present, though ECG and skin temperature monitoring are absent. At $449.99 versus $799, Amazfit provides exceptional value for endurance-focused users, while Apple Watch Ultra justifies premium pricing through comprehensive health data, premium materials, and seamless iOS integration. Choose based on your primary use case: adventure sports favors Amazfit; daily fitness with ecosystem lock-in favors Apple.
Who Should Buy
Buy the Amazfit T-Rex Ultra if…
- →Excellent 20-day battery life with always-on display
- →Dual-band six-satellite GPS for high accuracy
- →Rugged design with 15 military-grade certifications
Buy the Apple Watch Ultra (1st Gen) if…
- →Titanium case is exceptionally durable for extreme sports and diving
- →36-hour battery life (60 hrs in Low Power Mode) is longest for Apple Watch
- →2000-nit peak brightness is readable in any outdoor condition
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
Apple Watch Ultra (1st Gen)
Pros
- Titanium case is exceptionally durable for extreme sports and diving
- 36-hour battery life (60 hrs in Low Power Mode) is longest for Apple Watch
- 2000-nit peak brightness is readable in any outdoor condition
- Dual-frequency L1+L5 GPS provides precise tracking even in canyons
- Action Button is customizable for workouts, compass, and more
Cons
- 49mm case is very large — may be too bulky for smaller wrists
- Heavy at 61.3 g compared to standard Apple Watch models
- $799 is expensive for a first-generation product
- S8 chip is the same as Series 8 — no processing advantage
- Only one 49mm size option with no smaller variant
Full Specifications
| Spec | Amazfit T-Rex Ultra | Apple Watch Ultra (1st Gen) |
|---|---|---|
| Software | Zepp OS 2.0 | watchOS 9 (upgradable to watchOS 11+) |
| Body | ||
| Weight | 89 g | 61.3 g |
| Case material | Stainless steel bezel, fiber-reinforced polymer case | Titanium |
| Water resistance | 10 ATM, ISO 22810 certified for free-diving to 45m | WR100, EN13319 (certified for recreational scuba diving to 40m) |
| Health & Sensors | ||
| ECG | ||
| SpO₂ | ||
| Skin temperature | ||
| Heart rate | ||
| Sleep tracking | ||
| Battery | ||
| Battery life | Up to 20 days typical use, 80 hours GPS | Up to 36 hours (60 hrs in Low Power Mode) |
| Display | ||
| Size | 1.39 inch | 49mm |
| Type | AMOLED | LTPO OLED Always-On Retina |
| Always-on display | ||
| Resolution | 454 x 454 | 410 x 502 |
| Connectivity | ||
| GPS | ||
| NFC | ||
| Wi-Fi | ||
| Cellular | ||
| Bluetooth | 5.0 | 5.3 |
| Processor | ||
| Chipset | — | Apple S8 SiP |
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This comparison is based on verified manufacturer specifications covering display, performance, camera, battery, and build quality. Scores are generated by analyzing specs across weighted categories on a 10-point scale. Learn more about our methodology.
Explore more in smartwatches, see all Amazfit products or all Apple products. View full details for the Amazfit T-Rex Ultra or the Apple Watch Ultra (1st Gen).