Google Pixel Watch 3 (45mm) vs Amazfit T-Rex 3
If you're looking for a smartwatch that supports heavy usage without constant recharging, the T-Rex 3's impressive 27-day battery life stands out against the Pixel Watch's 24 hours with Always-On Display. In real-world use, the Pixel Watch's advanced running metrics and integration with Google services make it a strong contender for fitness enthusiasts. However, for someone who prioritizes battery longevity and robust outdoor capabilities, the Amazfit T-Rex 3 is a game-changer with its rugged design and features tailored for adventure seekers in 2026. Key specs: Weight: 1.31 oz vs 2.41 oz and Display: 1.5" vs 1.4".
Why compare these? The Google Pixel Watch 3 (45mm) (high-end) and Amazfit T-Rex 3 (mid-range) 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 | Google Pixel | Amazfit T-Rex |
|---|---|---|
| User Rating | 4.4★ (1,794 reviews) | ✓4.5★ (1,926 reviews) |
| Top Strength | Significantly larger and brighter display (2000 nits) than predecessors | Incredible 27-day battery life crushes the competition |
| Main Drawback | Battery life rated for only 24h with AOD (daily charging required) | No built-in speaker (alerts are beeps/vibrations only) |
| Market Position | ✓Premium | Mid-range |
Google Pixel Watch 3 (45mm)
Android 10.0 or newer (requires Google Account and Pixel Watch app); Not compatible with iOS
Wear OS 5.0
45mm diameter x 12.3mm height
100% recycled aluminum housing; Custom 3D Corning Gorilla Glass 5
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)
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: Google Pixel Watch 3 (45mm) vs Amazfit T-Rex 3
Google Pixel Watch 3 (45mm)
Amazfit T-Rex 3
| Criterion | Google Pixel Watch 3 (45mm) | Amazfit T-Rex 3 |
|---|---|---|
| Rating | ★4.4(1,794)Amazon | ★4.5(1,926)Amazon |
Compatibility | Android 10.0 or newer (requires Google Account and Pixel Watch app); Not compatible with iOS | Android 7.0 or later; iOS 14.0 or later (Zepp App required) |
Operating System | Wear OS 5.0 | Zepp OS 4 |
Case Size | 45mm diameter x 12.3mm height | 48.5mm x 48.5mm x 13.75mm |
Case Material | 100% recycled aluminum housing; Custom 3D Corning Gorilla Glass 5 | Polymer middle frame; Stainless steel bezel (316L) |
Display Type | Actua Display (AMOLED LTPO); 1–60Hz responsive refresh rate; Peak brightness 2000 nits; Minimum 1 nit | AMOLED; Gorilla Glass; Peak brightness 2000 nits |
Display Size | 1.4 in (approx. 40% more screen area than Pixel Watch 2) | 1.5 in (38.1 mm) diameter |
Resolution | 456 x 456 pixels (320 ppi); DCI-P3 color | 480 x 480 pixels (322 ppi) |
Always On Display | Yes | Yes |
Water Resistance | 5 ATM (ISO 22810:2010); IP68 (Dust and water resistant) | 10 ATM (100 meters); Freediving certified (EN13319) to 45m |
Durability | IP68 dust and water resistance rating; Custom 3D Corning Gorilla Glass 5 | MIL-STD-810H (70°C heat / -30°C cold / Shock / Humidity); Mud-resistant bridge and buttons |
GPS | GPS, GLONASS, Galileo, BeiDou, QZSS | Dual-band GNSS (L1+L5); 6 Satellite Positioning Systems (GPS, GLONASS, Galileo, BeiDou, QZSS, NAVIC) |
Connectivity | 4G LTE (optional); Wi-Fi 6 (802.11ax) 2.4GHz + 5GHz; Bluetooth 5.3; NFC; Ultra-Wideband (UWB) | Wi-Fi (2.4GHz); Bluetooth 5.2; BLE |
NFC Payments | Google Wallet | Zepp Pay (Europe/parts of Asia only); Not supported on US models |
Sensors | Compass; Altimeter; Red and infrared sensors for oxygen saturation (SpO2); Multipurpose electrical sensors (ECG); Multi-path optical heart rate sensor; 3-axis accelerometer; Gyroscope; Ambient light sensor; cEDA sensor (stress); Skin temperature sensor; Ultra-Wideband | BioTracker™ 6.0 PPG biometric sensor (SpO2, Heart Rate); Accelerometer; Gyroscope; Geomagnetic sensor; Barometric altimeter; Ambient light sensor; Temperature sensor (skin/water) |
Health Features | Loss of Pulse Detection; Daily Readiness; Cardio Load; Target Load; Sleep Profile; ECG app; SpO2; High/low heart rate notifications; Irregular heart rhythm notifications; Skin temperature variations; Body Response (stress detection) | 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 | Advanced Running Form (Cadence, Stride Length, Vertical Oscillation, Ground Contact Time); Custom Runs; Interval Training; 40+ exercise modes including HIIT, Pilates, Strength, Cross-country skiing, and more | Hyrox Race mode; Ultramarathon; Freediving; Strength Training (auto-detection of 25 movements); Triathlon; Skiing; Snowboarding; Surf; and 170+ others |
Storage | 32GB eMMC flash | 32GB (Approx. 26GB user-accessible for Music/Maps) |
Speaker Mic | Built-in speaker; Built-in microphone | Microphone (for Zepp Flow voice commands); No Speaker (Buzzer/Beeper only for alerts) |
Calls | Yes (Bluetooth); LTE models support standalone calls | No (Cannot answer calls on wrist; can reject/ignore calls) |
Battery | 420 mAh (typical); Up to 24 hours (Always-on Display enabled); Up to 36 hours (Battery Saver mode) | 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 | USB-C Fast Charging Cable (included); 0–50% in ~28 min; 0–80% in ~50 min; 0–100% in ~80 min | Magnetic charging base (2-pin); Approx. 3 hours to full charge |
Weight | 37 g (without band) | 68.3 g (without strap) |
Band Sizes | Active Band: Small fits 150–185 mm wrists; Large fits 165–215 mm wrists | 22mm width; Fits 145–210mm wrists (Proprietary screws but includes adapters for standard bands in some regions) |
Extras | UWB for Watch Unlock and finding devices; Google Home control; Camera Remote for Pixel phones; Offline Google Maps; Recorder app | Offline Maps (Contour/Terrain); Turn-by-turn navigation; Zepp Flow (AI voice assistant); Night Display mode; Glove mode |
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Google Pixel Watch 3 (45mm)
Android 10.0 or newer (requires Google Account and Pixel Watch app); Not compatible with iOS
Wear OS 5.0
45mm diameter x 12.3mm height
100% recycled aluminum housing; Custom 3D Corning Gorilla Glass 5
Actua Display (AMOLED LTPO); 1–60Hz responsive refresh rate; Peak brightness 2000 nits; Minimum 1 nit
1.4 in (approx. 40% more screen area than Pixel Watch 2)
Pros
- Significantly larger and brighter display (2000 nits) than predecessors
- Advanced running metrics (stride, oscillation) without external pods
Cons
- Battery life rated for only 24h with AOD (daily charging required)
- Strictly incompatible with iPhone (Android 10+ only)
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
Which one is better?
The Amazfit T-Rex 3 is the better buy for most people - its notable 27-day battery life crushes the Pixel Watch 3's 24-hour cycle. That said, grab the Google Pixel Watch 3 (45mm) if you want advanced health metrics and Google integration - it's a premium option worth the investment.
Who should buy each?
Choose the Google Pixel Watch 3 (45mm) if: you need advanced running metrics for training, prefer seamless Google ecosystem integration, or want a brighter display for outdoor visibility. (1.31 oz weight)
Choose the Amazfit T-Rex 3 if: you need a rugged smartwatch for outdoor activities, want to avoid daily charging with a 27-day battery, or prefer a larger display for easier reading.
Quality Seekers
Higher user rating (4.5★ vs 4.4★) indicates better overall satisfaction
→ Choose Amazfit T-Rex
Premium Buyers
Higher-tier option with more premium features and build quality
→ Choose Google Pixel
Value Seekers
Better value proposition for buyers who don't need top-tier features
→ Choose Amazfit T-Rex
Significantly larger and Priority
Significantly larger and brighter display (2000 nits) than predecessors
→ Choose Google Pixel
Conclusion
Google Pixel Watch 3 (45mm) and Amazfit T-Rex 3 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 leads with a 4.5★ rating versus 4.4★. That said, Google Pixel Watch 3 (45mm) could still be the right pick depending on your specific priorities.
Frequently Asked Questions
+Which is better: Google Pixel Watch 3 (45mm) or Amazfit T-Rex 3?
Google Pixel Watch 3 (45mm) is the better choice if you prioritize significantly larger and brighter display (2000 nits) than predecessors. Amazfit T-Rex 3 wins if you value incredible 27-day battery life crushes the competition. Both are rated highly (4.4★ vs 4.5★), so consider your specific needs and budget.
+What are the main differences between Google Pixel Watch 3 (45mm) and Amazfit T-Rex 3?
Key differences: Google Pixel Watch 3 (45mm) offers significantly larger and brighter display (2000 nits) than predecessors, while Amazfit T-Rex 3 stands out with incredible 27-day battery life crushes the competition. Consider that Google Pixel Watch 3 (45mm) battery life rated for only 24h with aod (daily charging required). Meanwhile, Amazfit T-Rex 3 no built-in speaker (alerts are beeps/vibrations only). 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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