Amazfit T-Rex Ultra vs Withings ScanWatch 2
Amazfit T-Rex Ultra excels as a sports-focused smartwatch with its vibrant 1.39-inch AMOLED display (454x454), robust 89g stainless steel construction rated for 10 ATM free-diving, and exceptional 20-day battery life with 80-hour GPS endurance. Withings ScanWatch 2 takes a classier approach at 39g with hybrid analog/OLED display and superior health monitoring—ECG and skin temperature tracking absent on the Amazfit. ScanWatch 2's 30-day battery and $100 lower price point appeal to users prioritizing medical-grade sensors and refined aesthetics over adventure capabilities. Amazfit edges out for serious athletes needing GPS and durability, while ScanWatch 2 suits health-conscious professionals wanting comprehensive biometrics in a traditional watch form. Choose T-Rex Ultra for outdoor performance; select ScanWatch 2 for comprehensive health data and elegant daily wear.
Full Specifications
| Spec | Amazfit T-Rex Ultra | Withings ScanWatch 2 |
|---|---|---|
| Software | Zepp OS 2.0 | Withings OS |
| Body | ||
| Weight | 89 g | 39 g |
| Case material | Stainless steel bezel, fiber-reinforced polymer case | Stainless steel |
| Water resistance | 10 ATM, ISO 22810 certified for free-diving to 45m | 5ATM |
| Health & Sensors | ||
| ECG | ||
| SpO₂ | ||
| Skin temperature | ||
| Heart rate | ||
| Sleep tracking | ||
| Battery | ||
| Battery life | Up to 20 days typical use, 80 hours GPS | Up to 30 days |
| Display | ||
| Size | 1.39 inch | 42 mm |
| Type | AMOLED | Hybrid analog + OLED |
| Always-on display | ||
| Resolution | 454 x 454 | Hybrid analog with OLED sub-display |
| Connectivity | ||
| GPS | ||
| NFC | ||
| Wi-Fi | ||
| Cellular | ||
| Bluetooth | 5.0 | 5.0 |
| Processor | ||
| Chipset | — | Withings proprietary |
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
Withings ScanWatch 2
Pros
- 30-day battery life is unmatched — charge monthly, not daily
- Looks like a luxury analog watch — no one will know it's smart
- Medical-grade ECG, SpO2, and respiratory rate monitoring
- Skin temperature tracking for early illness detection
- Stainless steel build is genuinely elegant
Cons
- No GPS — phone required for route tracking
- Tiny OLED sub-display limits notification readability
- No NFC for contactless payments
- No third-party apps — health tracking only
Related Comparisons
Explore more in smartwatches, see all Amazfit products or all Withings products. View full details for the Amazfit T-Rex Ultra or the Withings ScanWatch 2.