Software
- Apple Watch Series 12 42mm
- Runs watchOS 27
- Amazfit T-Rex 3 Pro
- Runs Zepp OS 6
Wearable comparison
Apple Watch Series 12 42mm vs Amazfit T-Rex 3 Pro
Compare battery life, health tracking, display and fit.
01Selected  Apple Watch Series 12 42mm
KSh 64,000In Stock | 02  Amazfit T-Rex 3 Pro
KSh 55,000In Stock |
|---|
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AmazFit FalconKSh 63,000
WHOOP LifeKSh 55,500
2 of 4 products
Our quick verdict
The Apple Watch Series 12 42mm runs watchOS built around the iPhone, takes ECG heart-rhythm readings, gives daily readiness scores and is lighter to wear all day, though it works only with an iPhone, while the Amazfit T-Rex 3 Pro lasts much longer between charges (25 days vs 24 hours), works with Android phones and iPhones and has a brighter screen for outdoor use.
Portability
- Apple Watch Series 12 42mm
- 32.2 g
- Amazfit T-Rex 3 Pro
- 52 g
Connections
- Apple Watch Series 12 42mm
- Wi-Fi 4, Bluetooth 5.3
- Amazfit T-Rex 3 Pro
- Bluetooth 5.2
Display
- Apple Watch Series 12 42mm
- OLED display, 326 ppi
- Amazfit T-Rex 3 Pro
- 1.5-inch OLED display, 322 ppi
Water resistance
- Apple Watch Series 12 42mm
- 50 m swimproof under ISO 22810:2010
- Amazfit T-Rex 3 Pro
- 10 ATM
Key differences
The main differences to help you choose.
Apple Watch Series 12 42mm
- Lighter: 32.2 g (vs 52 g).
- ECG heart-rhythm readings.
- Daily readiness scores.
- Blood-pressure (hypertension) notifications.
- Slimmer: 9.7 mm thick (vs 14 mm).
Amazfit T-Rex 3 Pro
- Longer battery life: up to 25 days (vs 24 hours).
- Longer sport-mode battery: up to 38 hours in GPS mode (vs 10 hours in outdoor workout mode).
- Brighter display: up to 3,000 nits (vs 2,000).
- Works with Android phones and iPhones.
- Swimproof: water resistant to 100 m (vs 50 m).
- Rated for free diving to 45 m.
What matters most to you?
6 priorities selected.
| Priority | Apple Watch Series 12 42mm | Amazfit T-Rex 3 Pro |
|---|---|---|
| Battery life | Up to 24 hours per charge | 48 mm: 25 days typical, 10 days heavy, 38 hours accurate GPS |
| Portability | 32.2 g | 52 g |
| Software | watchOS 27 | Zepp OS 6 |
| Connections | Wi-Fi 4, Bluetooth 5.3 | Bluetooth 5.2 |
| Display | OLED display, 326 ppi | 1.5-inch OLED display, 322 ppi |
| Water resistance | 50 m swimproof under ISO 22810:2010 | 10 ATM |
| Sensors | High-g accelerometer, high dynamic-range gyroscope | BioTracker 6.0 PPG, accelerometer |
| Sleep tracking | Sleep duration and stages, sleep score | Sleep stages including REM, naps |
| Charging | Fast-charge capable | Magnetic charging head |
| Peak brightness | Up to 2,000 nits peak | 3,000 nits peak |
| Speaker | Speaker with media playback | Supported |
| Durability / certifications | IP6X dust resistance | Rugged outdoor construction with Grade 5 titanium controls and sapphire glass |
| Positioning / GNSS | Precision L1 GPS, GLONASS | Dual-band GNSS, 6 satellite systems |
| Health & wellness features | Heart rate and HRV, Blood Oxygen | 24-hour heart rate, SpO₂ and stress |
| Controls / buttons | Digital Crown with haptic feedback | 4 physical buttons, touchscreen |
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.
Similarities
- Both take calls over Bluetooth.
- Both have OLED displays.
- Both connect over Bluetooth.
In summary
Get the Amazfit T-Rex 3 Pro if you want much longer battery life and a choice of Android phone or iPhone, or the Apple Watch Series 12 42mm if you would rather have ECG heart-rhythm readings and daily readiness scores.
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