Amazfit T-Rex 3 vs Withings ScanWatch Nova
The Amazfit T-Rex 3 is the mid-range option here, while the Withings ScanWatch Nova takes the premium crown. In real-world use, the T-Rex 3’s 27-day battery life crushes the competition, giving you plenty of time between charges. However, the ScanWatch Nova's clinical-grade health sensors—in a stylish design—make it a tempting choice for those who prioritize health metrics. Key specs: Weight: 2.41 oz vs 2.22 oz and Battery: 27 days vs 30 days.
Why compare these? The Amazfit T-Rex 3 (mid-range) and Withings ScanWatch Nova (high-end) represent different approaches to smartwatches. While they may appeal to different budgets, many buyers consider both options. This 2026 comparison helps you decide if the differences justify the price gap.
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Key Differences at a Glance
| Aspect | Amazfit T-Rex | Withings ScanWatch |
|---|---|---|
| User Rating | ✓4.5★ (1,926 reviews) | 4★ (268 reviews) |
| Top Strength | Incredible 27-day battery life crushes the competition | Elegant 'diver' aesthetic with ceramic bezel and sapphire glass |
| Main Drawback | No built-in speaker (alerts are beeps/vibrations only) | Small monochrome screen limits notification readability and smart features |
| Market Position | Mid-range | ✓Premium |
Amazfit T-Rex 3
Android 7.0 or later; iOS 14.0 or later (Zepp App required)
Zepp OS 4
48.5mm x 48.5mm x 13.75mm
Polymer middle frame; Stainless steel bezel (316L)
Withings ScanWatch Nova
iPhone (iOS 15+) and Android (Android 9+)
HealthSense™ OS (Proprietary)
42mm (42 mm diameter / 1.65 in; 12.8 mm thickness)
Case: Polished stainless steel; Bezel: Ceramic and stainless steel (rotating); Glass: Anti-reflective sapphire crystal
Only the specs that differ are shown here. Winners are highlighted when the data is clear.
+Full specs, pros, and cons
Everything side-by-side with ratings and the full spec list.
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Full specs, pros, and cons
Everything side-by-side with ratings and the full spec list.
Comparison: Amazfit T-Rex 3 vs Withings ScanWatch Nova
Amazfit T-Rex 3
Withings ScanWatch Nova
| Criterion | Amazfit T-Rex 3 | Withings ScanWatch Nova |
|---|---|---|
| Rating | ★4.5(1,926)Amazon | ★4(268)Amazon |
Compatibility | Android 7.0 or later; iOS 14.0 or later (Zepp App required) | iPhone (iOS 15+) and Android (Android 9+) |
Operating System | Zepp OS 4 | HealthSense™ OS (Proprietary) |
Case Size | 48.5mm x 48.5mm x 13.75mm | 42mm (42 mm diameter / 1.65 in; 12.8 mm thickness) |
Case Material | Polymer middle frame; Stainless steel bezel (316L) | Case: Polished stainless steel; Bezel: Ceramic and stainless steel (rotating); Glass: Anti-reflective sapphire crystal |
Display Type | AMOLED; Gorilla Glass; Peak brightness 2000 nits | Grayscale OLED (0.63 inch) + Analog hands (Hybrid) |
Display Size | 1.5 in (38.1 mm) diameter | 0.63 in (digital screen) |
Resolution | 480 x 480 pixels (322 ppi) | 14,504 pixels (282 PPI) |
Always On Display | Yes | Yes (Analog hands always visible) |
Water Resistance | 10 ATM (100 meters); Freediving certified (EN13319) to 45m | 10 ATM (100 meters) |
Durability | MIL-STD-810H (70°C heat / -30°C cold / Shock / Humidity); Mud-resistant bridge and buttons | Sapphire crystal face; Stainless steel case; Ceramic bezel; 5-year guarantee (region dependent) |
GPS | Dual-band GNSS (L1+L5); 6 Satellite Positioning Systems (GPS, GLONASS, Galileo, BeiDou, QZSS, NAVIC) | Connected GPS (Requires smartphone connection) |
Connectivity | Wi-Fi (2.4GHz); Bluetooth 5.2; BLE | Bluetooth Low Energy (BLE) |
NFC Payments | Zepp Pay (Europe/parts of Asia only); Not supported on US models | No (Not supported) |
Sensors | BioTracker™ 6.0 PPG biometric sensor (SpO2, Heart Rate); Accelerometer; Gyroscope; Geomagnetic sensor; Barometric altimeter; Ambient light sensor; Temperature sensor (skin/water) | Multi-wavelength PPG (Heart rate/SpO2); TempTech24/7 Module (Body temp); High Dynamic Range Accelerometer; Altimeter; ECG electrodes |
Health Features | Readiness Score; HRV (Heart Rate Variability); Sleep Breathing Quality; One-tap measuring (HR, SpO2, Stress, Breathing rate); Sleep stages (REM/Deep/Light); PAI Health Assessment | ECG (AFib detection); Body temperature variation (day/night); Blood oxygen (SpO2); Sleep quality score; Respiratory scan; Heart rate variability (HRV) |
Workout Modes | Hyrox Race mode; Ultramarathon; Freediving; Strength Training (auto-detection of 25 movements); Triathlon; Skiing; Snowboarding; Surf; and 170+ others | 40+ sports modes; Automatic activity detection (Walking, Running, Swimming, Cycling); Fitness Level (VO2 max estimation) |
Storage | 32GB (Approx. 26GB user-accessible for Music/Maps) | Free unlimited online storage; 7 days of data stored on watch |
Speaker Mic | Microphone (for Zepp Flow voice commands); No Speaker (Buzzer/Beeper only for alerts) | No (No built-in speaker or microphone) |
Calls | No (Cannot answer calls on wrist; can reject/ignore calls) | No (Notification alerts only) |
Battery | 700 mAh; Up to 27 days (Typical usage); Up to 13 days (Heavy usage); Up to 42 hours (Accuracy GPS mode); Up to 114 hours (GPS Long Battery Life) | Up to 30 days (Standard use); Rechargeable Lithium-ion |
Charging | Magnetic charging base (2-pin); Approx. 3 hours to full charge | USB-C compatible docking station (approx. 2 hours to 100%) |
Weight | 68.3 g (without strap) | 63 g (2.22 oz) without wristband |
Band Sizes | 22mm width; Fits 145–210mm wrists (Proprietary screws but includes adapters for standard bands in some regions) | Fits wrist sizes (approx. 163–239 mm); Standard 20 mm lug width |
Extras | Offline Maps (Contour/Terrain); Turn-by-turn navigation; Zepp Flow (AI voice assistant); Night Display mode; Glove mode | Luminova hands/indexes; Digital crown for navigation; Stopwatch; Timer; Alarm; Breathwork; Apple Health & Google Fit sync |
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Amazfit T-Rex 3
Android 7.0 or later; iOS 14.0 or later (Zepp App required)
Zepp OS 4
48.5mm x 48.5mm x 13.75mm
Polymer middle frame; Stainless steel bezel (316L)
AMOLED; Gorilla Glass; Peak brightness 2000 nits
1.5 in (38.1 mm) diameter
Pros
- Incredible 27-day battery life crushes the competition
- Large, bright 1.5" AMOLED (2000 nits) is easy to read outdoors
Cons
- No built-in speaker (alerts are beeps/vibrations only)
- NFC payments (Zepp Pay) are not supported on US hardware
Withings ScanWatch Nova
iPhone (iOS 15+) and Android (Android 9+)
HealthSense™ OS (Proprietary)
42mm (42 mm diameter / 1.65 in; 12.8 mm thickness)
Case: Polished stainless steel; Bezel: Ceramic and stainless steel (rotating); Glass: Anti-reflective sapphire crystal
Grayscale OLED (0.63 inch) + Analog hands (Hybrid)
0.63 in (digital screen)
Pros
- Elegant 'diver' aesthetic with ceramic bezel and sapphire glass
- Clinical-grade health sensors (ECG, SpO2, Temperature) in a non-intrusive form factor
Cons
- Small monochrome screen limits notification readability and smart features
- No built-in GPS (relies on phone connection for tracking routes)
Which one is better?
The Amazfit T-Rex 3 is the better buy for most people - its 27-day battery life crushes the ScanWatch Nova's 30-day claim when you consider its rich feature set. That said, grab the Withings ScanWatch Nova if you want elegant design and advanced health tracking - it's lighter at 2.22 oz.
Who should buy each?
Choose the Amazfit T-Rex 3 if: you want a rugged smartwatch for outdoor adventures, need a long-lasting battery for weeks of use, or love having a large, bright display for easy reading. (2.41 oz weight)
Choose the Withings ScanWatch Nova if: you prefer a stylish watch that excels in health tracking, want up to 30 days of battery life, or value a lightweight design for everyday wear.
Quality Seekers
Higher user rating (4.5★ vs 4★) indicates better overall satisfaction
→ Choose Amazfit T-Rex
Safe Choice Buyers
More widely tested with 1,926 reviews vs 268
→ Choose Amazfit T-Rex
Premium Buyers
Higher-tier option with more premium features and build quality
→ Choose Withings ScanWatch
Value Seekers
Better value proposition for buyers who don't need top-tier features
→ Choose Amazfit T-Rex
Conclusion
Amazfit T-Rex 3 and Withings ScanWatch Nova are both solid choices. Match the strengths above to your budget and workflow to make the best call.
Bottom line: The Amazfit T-Rex 3 edges ahead with a 4.5★ rating compared to 4★. However, Withings ScanWatch Nova remains a strong contender if its strengths align better with your needs.
Frequently Asked Questions
+Which is better: Amazfit T-Rex 3 or Withings ScanWatch Nova?
Amazfit T-Rex 3 is the better choice if you prioritize incredible 27-day battery life crushes the competition. Withings ScanWatch Nova wins if you value elegant 'diver' aesthetic with ceramic bezel and sapphire glass. Both are rated highly (4.5★ vs 4★), so consider your specific needs and budget.
+What are the main differences between Amazfit T-Rex 3 and Withings ScanWatch Nova?
Key differences: Amazfit T-Rex 3 offers incredible 27-day battery life crushes the competition, while Withings ScanWatch Nova stands out with elegant 'diver' aesthetic with ceramic bezel and sapphire glass. Consider that Amazfit T-Rex 3 no built-in speaker (alerts are beeps/vibrations only). Meanwhile, Withings ScanWatch Nova small monochrome screen limits notification readability and smart features. Check the detailed specs table above for a complete comparison.
+Where can US buyers get the best price?
For US buyers, Amazon typically offers competitive pricing with Prime shipping, easy returns, and reliable warranty support. We recommend comparing prices on both products using our affiliate links above—prices fluctuate regularly, and you may find sales or deals.
+Is this comparison up to date?
Yes, this comparison is current for 2026. We regularly verify specs, ratings, and availability. Last verified: January 27, 2026. PageBen uses affiliate links for monetization, but our recommendations are research-driven and independent.
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