Battery life
- Amazfit T-Rex 3
- 700 mAh battery
- WHOOP 4.0 Sensor
- Approximately 5 days
Wearable comparison
Amazfit T-Rex 3 vs WHOOP 4.0
Compare battery life, health tracking, display and fit.
01Selected  Amazfit T-Rex 3
KSh 33,000In Stock | 02  WHOOP 4.0 Sensor
KSh 36,000In Stock |
|---|
Add to comparison
2 spaces available
Huawei Watch GT 7 41mmKSh 33,000
AmazFit Cheetah RoundKSh 28,000
AmazFit CheetahKSh 28,000
Huawei Watch GT 5 ProKSh 34,000
Huawei Watch GT 6 ProKSh 33,500
OnePlus Watch 3KSh 33,000
Amazfit Balance 2KSh 39,000
2 of 4 products
Our quick verdict
The Amazfit T-Rex 3, a smartwatch with a 1.5-inch OLED screen, lasts much longer between charges (27 days vs 5 days), has built-in GPS for runs without your phone and is swimproof to 100 m, while the WHOOP 4.0 Sensor, a screenless tracker you read in the WHOOP app, gives daily recovery and strain scores.
Display
- Amazfit T-Rex 3
- 1.5-inch OLED display, 322 ppi
- WHOOP 4.0 Sensor
- Screenless tracker
Software
- Amazfit T-Rex 3
- Zepp OS 6
- WHOOP 4.0 Sensor
- WHOOP
Connections
- Amazfit T-Rex 3
- Bluetooth 5.2
- WHOOP 4.0 Sensor
- Bluetooth 4.2
Water resistance
- Amazfit T-Rex 3
- 10 ATM
- WHOOP 4.0 Sensor
- IP68 water and dust resistance
Key differences
The main differences to help you choose.
Amazfit T-Rex 3
- Longer battery life: up to 27 days (vs 5 days).
- Screen on the wrist for the time, notifications and workout stats.
- Built-in GPS (the other uses the phone's GPS).
- Swimproof: water resistant to 100 m (vs 10 m).
- Rated for free diving to 45 m.
- Lower price: KSh 33,000 (vs KSh 36,000).
WHOOP 4.0 Sensor
- Screenless: worn day and night, with results read in the WHOOP app.
- Daily recovery and strain scores.
What matters most to you?
6 priorities selected.
| Priority | Amazfit T-Rex 3 | WHOOP 4.0 Sensor |
|---|---|---|
| Battery life | 700 mAh battery | Approximately 5 days |
| Display | 1.5-inch OLED display, 322 ppi | Screenless tracker |
| Software | Zepp OS 6 | WHOOP |
| Connections | Bluetooth 5.2 | Bluetooth 4.2 |
| Water resistance | 10 ATM | IP68 water and dust resistance |
| Sensors | BioTracker 6.0 PPG, accelerometer | PPG heart-rate sensor, accelerometer |
| Sleep tracking | Sleep stages including REM, naps | Light, REM and deep sleep |
| Charging | Magnetic charging head | WHOOP 4.0 slide-on wireless Battery Pack |
| Positioning / GNSS | Dual-band GNSS, 6 satellite positioning systems | Connected smartphone GPS, no built-in GPS |
| Health & wellness features | 24-hour heart rate, SpO₂ and stress | Continuous heart rate, HRV |
| Sports / workout modes | 177 sports modes | Automatic and manual activity tracking |
| Smart recognition | 25 strength-training movements, 8 sports movements | Automatic activity detection |
| Strap / band | 22 mm liquid silicone, pin buckle | WHOOP 4.0 SuperKnit |
| Packing list | Watch with standard strap, magnetic charging head | WHOOP 4.0 sensor, compatible band |
Tick a topic above to see how each product answers it.
Detailed comparison
Explore the full specifications, section by section.
These products have the same published specifications.
In summary
For most buyers the Amazfit T-Rex 3 is the better buy; the WHOOP 4.0 Sensor makes sense if you want a screenless tracker with daily recovery and strain scores.
Back to compared products ↑