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2026 comparison
Updated Jan 7, 2026
|Sources: Amazon, ManufacturerAmazfit T-Rex 3 vs Withings ScanWatch Nova
The Amazfit T-Rex 3 is the smarter buy for most people due to its stunning 1.5" AMOLED display at 2000 nits, offering unbeatable visibility outdoors. Meanwhile, the Withings ScanWatch Nova's elegant design and clinical-grade health features make it a premium choice for health enthusiasts looking for sophistication in 2026. In real-world use, the T-Rex 3's 27-day battery life is impressive but not quite as long as the ScanWatch Nova's 30-day runtime. If you prioritize battery life and a larger display for outdoor activities, the Amazfit T-Rex 3 crushes the competition. However, for those who want top-notch health metrics in a stylish form factor, the Nova is a compelling option.
⚖️ Weight: 2.41 oz vs 2.22 oz📱 Display: 1.5" AMOLED (2000 nits) vs 0.63" OLED🔋 Battery: 27 days vs 30 days
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Amazfit T-Rex 3
★4.5
(1,926)•Amazon
Compatibility:Android 7.0 or later; iOS 14.0 or later (Zepp App required)
Operating System:Zepp OS 4
Case Size:48.5mm x 48.5mm x 13.75mm
Case Material:Polymer middle frame; Stainless steel bezel (316L)
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Withings ScanWatch Nova
★4
(268)•Amazon
Compatibility:iPhone (iOS 15+) and Android (Android 9+)
Operating System:HealthSense™ OS (Proprietary)
Case Size:42mm (42 mm diameter / 1.65 in; 12.8 mm thickness)
Case Material:Case: Polished stainless steel; Bezel: Ceramic and stainless steel (rotating); Glass: Anti-reflective sapphire crystal
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Key spec differences
Only the specs that differ are shown here. Winners are highlighted when the data is clear.
Winner= clear advantage
Spec
Amazfit T-Rex 3
Withings ScanWatch Nova
Display2 specs
Display SizeKey
Amazfit T-Rex 3
1.5 in (38.1 mm) diameter
Withings ScanWatch Nova
0.63 in (digital screen)
Resolution
Amazfit T-Rex 3
480 x 480 pixels (322 ppi)
Withings ScanWatch Nova
14,504 pixels (282 PPI)
Performance1 specs
Storage
Amazfit T-Rex 3
32GB (Approx. 26GB user-accessible for Music/Maps)
Withings ScanWatch Nova
Free unlimited online storage; 7 days of data stored on watch
Battery1 specs
Battery CapacityKey
Amazfit T-Rex 3
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)
Withings ScanWatch Nova
Up to 30 days (Standard use); Rechargeable Lithium-ion
Design2 specs
Weight
Amazfit T-Rex 3
68.3 g (without strap)
Withings ScanWatch Nova
63 g (2.22 oz) without wristbandWinner
Water Resistance
Amazfit T-Rex 3
10 ATM (100 meters); Freediving certified (EN13319) to 45m
Withings ScanWatch Nova
10 ATM (100 meters)
Software1 specs
Operating System
Amazfit T-Rex 3
Zepp OS 4
Withings ScanWatch Nova
HealthSense™ OS (Proprietary)
Connectivity1 specs
Connectivity
Amazfit T-Rex 3
Wi-Fi (2.4GHz); Bluetooth 5.2; BLE
Withings ScanWatch Nova
Bluetooth Low Energy (BLE)
+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
★4.5(1,926)Amazon
Withings ScanWatch Nova
★4(268)Amazon
| 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
Rating:★4.5(1,926)Amazon
Compatibility:Android 7.0 or later; iOS 14.0 or later (Zepp App required)
Operating System:Zepp OS 4
Case Size:48.5mm x 48.5mm x 13.75mm
Case Material:Polymer middle frame; Stainless steel bezel (316L)
Display Type:AMOLED; Gorilla Glass; Peak brightness 2000 nits
Display Size:1.5 in (38.1 mm) diameter
Resolution:480 x 480 pixels (322 ppi)
Always On Display:Yes
Water Resistance:10 ATM (100 meters); Freediving certified (EN13319) to 45m
Durability:MIL-STD-810H (70°C heat / -30°C cold / Shock / Humidity); Mud-resistant bridge and buttons
GPS:Dual-band GNSS (L1+L5); 6 Satellite Positioning Systems (GPS, GLONASS, Galileo, BeiDou, QZSS, NAVIC)
Connectivity:Wi-Fi (2.4GHz); Bluetooth 5.2; BLE
NFC Payments:Zepp Pay (Europe/parts of Asia only); Not supported on US models
Sensors:BioTracker™ 6.0 PPG biometric sensor (SpO2, Heart Rate); Accelerometer; Gyroscope; Geomagnetic sensor; Barometric altimeter; Ambient light sensor; Temperature sensor (skin/water)
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
Workout Modes:Hyrox Race mode; Ultramarathon; Freediving; Strength Training (auto-detection of 25 movements); Triathlon; Skiing; Snowboarding; Surf; and 170+ others
Storage:32GB (Approx. 26GB user-accessible for Music/Maps)
Speaker Mic:Microphone (for Zepp Flow voice commands); No Speaker (Buzzer/Beeper only for alerts)
Calls:No (Cannot answer calls on wrist; can reject/ignore calls)
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)
Charging:Magnetic charging base (2-pin); Approx. 3 hours to full charge
Weight:68.3 g (without strap)
Band Sizes:22mm width; Fits 145–210mm wrists (Proprietary screws but includes adapters for standard bands in some regions)
Extras:Offline Maps (Contour/Terrain); Turn-by-turn navigation; Zepp Flow (AI voice assistant); Night Display mode; Glove mode
✓ Pros:
- • Incredible 27-day battery life crushes the competition
- • Large, bright 1.5" AMOLED (2000 nits) is easy to read outdoors
- • Free offline contour maps with turn-by-turn navigation
- • Freediving certified to 45m (rare at this price point)
- • Generous 32GB storage for offline music and global maps
✗ Cons:
- • No built-in speaker (alerts are beeps/vibrations only)
- • NFC payments (Zepp Pay) are not supported on US hardware
- • Large 48.5mm case is bulky for smaller wrists
- • Proprietary strap system requires adapters to use standard bands
As an Amazon Associate I earn from qualifying purchases.
Check Price on Amazon→
Withings ScanWatch Nova
Rating:★4(268)Amazon
Compatibility:iPhone (iOS 15+) and Android (Android 9+)
Operating System:HealthSense™ OS (Proprietary)
Case Size:42mm (42 mm diameter / 1.65 in; 12.8 mm thickness)
Case Material:Case: Polished stainless steel; Bezel: Ceramic and stainless steel (rotating); Glass: Anti-reflective sapphire crystal
Display Type:Grayscale OLED (0.63 inch) + Analog hands (Hybrid)
Display Size:0.63 in (digital screen)
Resolution:14,504 pixels (282 PPI)
Always On Display:Yes (Analog hands always visible)
Water Resistance:10 ATM (100 meters)
Durability:Sapphire crystal face; Stainless steel case; Ceramic bezel; 5-year guarantee (region dependent)
GPS:Connected GPS (Requires smartphone connection)
Connectivity:Bluetooth Low Energy (BLE)
NFC Payments:No (Not supported)
Sensors:Multi-wavelength PPG (Heart rate/SpO2); TempTech24/7 Module (Body temp); High Dynamic Range Accelerometer; Altimeter; ECG electrodes
Health Features:ECG (AFib detection); Body temperature variation (day/night); Blood oxygen (SpO2); Sleep quality score; Respiratory scan; Heart rate variability (HRV)
Workout Modes:40+ sports modes; Automatic activity detection (Walking, Running, Swimming, Cycling); Fitness Level (VO2 max estimation)
Storage:Free unlimited online storage; 7 days of data stored on watch
Speaker Mic:No (No built-in speaker or microphone)
Calls:No (Notification alerts only)
Battery:Up to 30 days (Standard use); Rechargeable Lithium-ion
Charging:USB-C compatible docking station (approx. 2 hours to 100%)
Weight:63 g (2.22 oz) without wristband
Band Sizes:Fits wrist sizes (approx. 163–239 mm); Standard 20 mm lug width
Extras:Luminova hands/indexes; Digital crown for navigation; Stopwatch; Timer; Alarm; Breathwork; Apple Health & Google Fit sync
✓ Pros:
- • Elegant 'diver' aesthetic with ceramic bezel and sapphire glass
- • Clinical-grade health sensors (ECG, SpO2, Temperature) in a non-intrusive form factor
- • Exceptional battery life (30 days) compared to standard smartwatches
- • Water-resistant to 10 ATM (100m), suitable for swimming and snorkeling
- • Distraction-free interface with a small, discreet digital screen
✗ Cons:
- • Small monochrome screen limits notification readability and smart features
- • No built-in GPS (relies on phone connection for tracking routes)
- • No music controls, NFC payments, or third-party apps
- • Heavy on the wrist (63g watch head only) due to steel construction
As an Amazon Associate I earn from qualifying purchases.
Check Price on Amazon→
Which one is better?
The Amazfit T-Rex 3 is the better buy for most people - its vibrant 1.5" AMOLED display at 2000 nits crushes the Withings ScanWatch Nova's smaller screen. That said, grab the Nova if you prioritize clinical-grade health features and a refined design - it's worth considering for its health metrics.
Who should buy each?
Choose the Amazfit T-Rex 3 if: you need a long-lasting battery life of 27 days, you want a bright display for outdoor readability, or you engage in outdoor sports like freediving.
Choose the Withings ScanWatch Nova if: you seek elegant design with a ceramic bezel, you want advanced health monitoring features like ECG, or you prefer a more sophisticated smartwatch aesthetic. (2.22 oz weight)
Conclusion
We hope this comparison helps you buy with confidence. Both products are dependable; the right one depends on how you will use it.
Frequently Asked Questions
+Which has better value?
Amazfit T-Rex 3 excels if you value incredible 27-day battery life crushes the competition. Withings ScanWatch Nova is better if you prioritize elegant 'diver' aesthetic with ceramic bezel and sapphire glass. Pick based on your budget and daily use.
+Is this an independent review?
Yes. We use affiliate links for monetization, but recommendations are research-driven and unbiased.
+Do newer models exist?
Check release timelines from the manufacturers and compare pricing before you buy. We refresh this page when major updates land.
Affiliate disclosure
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