Amazfit T-Rex 3 Pro vs WHOOP Life MG
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At a glance
Key specifications and important differences. Full details follow below.
| Feature |  Amazfit T-Rex 3 Pro |  WHOOP Life MG |
|---|---|---|
| Price | Price range: KSh 55,000.00 through KSh 65,000.00 | KSh 50,500.00 |
| Display | AMOLED 48 mm: 1.5-inch 44 mm: 1.32-inch | — |
| Battery capacity | 48 mm: 700 mAh rated 44 mm: 500 mAh rated | — |
| Water resistance | 10 ATM | IP68, water-resistant to 10 m; suitable for swimming and showering, not diving; ECG readings must be taken dry |
| Operating system | Zepp OS 5 | — |
| Positioning / GNSS | Built-in six-satellite positioning with circularly polarized GPS antenna | — |
| Health & wellness features | Heart rate, blood oxygen, stress, HRV, readiness and temperature insights; wellness measurements are not intended for medical diagnosis | Continuous heart rate and skin-temperature tracking; Recovery, Strain and Healthspan insights; Heart Screener with ECG, irregular-rhythm notifications and Blood Pressure Insights are region-, age- and eligibility-dependent and are not diagnostic |
Full specifications
2 of 4 products
| Specification | Amazfit T-Rex 3 Pro | WHOOP Life MG |
|---|---|---|
| Identity & design | ||
| Brand | Amazfit | WHOOP |
| Model | T-Rex 3 Pro | WHOOP MG with Life membership |
| Dimensions | 48 mm: 48 × 48 × 14 mm 44 mm: 44.8 × 44.8 × 13.2 mm Heart-rate sensor base excluded | 34.7 × 24 × 10.6 mm |
| Weight | 48 mm: 52 g 44 mm: 46.8 g Without strap | Approximately 27.3 g with band |
| Build materials | Fiber-reinforced polymer case with Grade 5 titanium bezel and buttons; sapphire-glass touchscreen | Compact matte-black sensor with brushed-metal detailing and conductive ECG clasp |
| Wrist size | 48 mm: 145–210 mm 44 mm: 140–205 mm | — |
| Strap / band | Silicone quick-release strap 48 mm: 22 mm 44 mm: 20 mm | SuperKnit Luxe band in Obsidian/Platinum with ECG-compatible conductive clasp |
| Controls / buttons | Four physical buttons and touchscreen | Screen-free wearable; measurements and controls are managed through the WHOOP app |
| Display | ||
| Display | AMOLED 48 mm: 1.5-inch 44 mm: 1.32-inch | — |
| Screen resolution | 48 mm: 480 × 480 pixels, 322 ppi 44 mm: 466 × 466 pixels, 353 ppi | — |
| Display protection | Sapphire glass | — |
| Display features | Up to 3,000 nits peak brightness; always-on display | — |
| Performance & software | ||
| Operating system | Zepp OS 5 | — |
| Connectivity | ||
| Wi-Fi | 2.4 GHz Wi-Fi | — |
| Bluetooth | Bluetooth 5.2 BLE | Bluetooth 5.0 or later required for ECG and Blood Pressure Insights |
| Positioning / GNSS | Built-in six-satellite positioning with circularly polarized GPS antenna | — |
| Audio & communication | ||
| Speaker | Built-in speaker | — |
| Microphone | Built-in microphone | — |
| Calling | Bluetooth calling when paired with a compatible phone | — |
| Sensors, health & fitness | ||
| Sensors | BioTracker 6.0 PPG biometric sensor (5PD + 2LED), accelerometer, gyroscope, geomagnetic sensor, barometric altimeter, ambient-light sensor and temperature sensor | Enhanced PPG biometric sensor, accelerometer, skin-temperature sensor and ECG-ready contact pads |
| Health & wellness features | Heart rate, blood oxygen, stress, HRV, readiness and temperature insights; wellness measurements are not intended for medical diagnosis | Continuous heart rate and skin-temperature tracking; Recovery, Strain and Healthspan insights; Heart Screener with ECG, irregular-rhythm notifications and Blood Pressure Insights are region-, age- and eligibility-dependent and are not diagnostic |
| Sleep tracking | Sleep stages, naps, sleep score, breathing quality and recovery insights | Sleep duration, stages, performance, consistency, debt and coaching through the WHOOP app |
| Sports / workout modes | 187 sports modes with smart recognition for strength-training and sports movements | Automatic and manual activity tracking across supported workouts in the WHOOP app |
| Training & outdoor features | Offline base, contour and ski maps; turn-by-turn navigation, POI search, route planning, round-trip routing, auto-rerouting, Zepp Coach and PeakBeats training metrics | Strain, Recovery, VO2 max, training load and personalized coaching insights |
| Safety & emergency features | SOS tools and downloadable maps; requires appropriate setup and phone connectivity for supported communications | — |
| Diving / depth features | Freediving and scuba modes rated to 45 m; follow the manufacturer’s diving limits and safety guidance | — |
| Battery & durability | ||
| Battery capacity | 48 mm: 700 mAh rated 44 mm: 500 mAh rated | — |
| Battery life | 48 mm: up to 25 days typical, 10 days heavy, 38 hours accurate GPS 44 mm: up to 17 days typical, 8 days heavy, 26 hours accurate GPS | Up to 14 days |
| Charging | Magnetic charging base | USB-C Basic Charger or magnetic Wireless PowerPack; approximately 120 minutes; not compatible with WHOOP 4.0 chargers |
| Water resistance | 10 ATM | IP68, water-resistant to 10 m; suitable for swimming and showering, not diving; ECG readings must be taken dry |
| Durability / certifications | Rugged outdoor construction with Grade 5 titanium controls and sapphire glass | — |
| Compatibility | ||
| Phone compatibility | Android 7.0 or later; iOS 15.0 or later | Compatible phone running the current WHOOP app; iOS 16 or later, with Bluetooth 5.0+ required for ECG and Blood Pressure Insights |
| Companion app | Zepp app | WHOOP app with active WHOOP Life membership |
| Colors | Black Gold (44mm), Black Gold (48mm); Gold/Grey, Tactical Black | Obsidian sensor and Obsidian/Platinum band |
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