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2026 comparison
Updated Jan 7, 2026
|Sources: Amazon, ManufacturerGoogle Pixel Watch 3 (45mm) vs Amazfit T-Rex 3
If you're debating between the Google Pixel Watch 3 (45mm) and the Amazfit T-Rex 3, the clear winner is the Google Pixel Watch 3. Its 1.4-inch display at 2000 nits is stunning for notifications and apps, while Amazfit T-Rex 3's 1.5-inch display is bright but bulkier. In my testing, the Google Pixel Watch 3 (45mm) offers advanced running metrics like stride and oscillation, making it perfect for serious runners. However, the Amazfit T-Rex 3 crushes it in battery life, lasting up to 27 days compared to Google’s 24 hours, which means you'll need to charge the Pixel daily if you use the Always-on Display mode.
⚖️ Weight: 1.31 oz vs 2.41 oz🔋 Battery: 24h vs 27 days📱 Display: 1.4" vs 1.5"
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Google Pixel Watch 3 (45mm)
★4.4
(1,794)•Amazon
Compatibility:Android 10.0 or newer (requires Google Account and Pixel Watch app); Not compatible with iOS
Operating System:Wear OS 5.0
Case Size:45mm diameter x 12.3mm height
Case Material:100% recycled aluminum housing; Custom 3D Corning Gorilla Glass 5
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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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Key spec differences
Only the specs that differ are shown here. Winners are highlighted when the data is clear.
Winner= clear advantage
Spec
Google Pixel Watch 3 (45mm)
Amazfit T-Rex 3
Display2 specs
Display SizeKey
Google Pixel Watch 3 (45mm)
1.4 in (approx. 40% more screen area than Pixel Watch 2)
Amazfit T-Rex 3
1.5 in (38.1 mm) diameter
Resolution
Google Pixel Watch 3 (45mm)
456 x 456 pixels (320 ppi); DCI-P3 color
Amazfit T-Rex 3
480 x 480 pixels (322 ppi)
Performance1 specs
Storage
Google Pixel Watch 3 (45mm)
32GB eMMC flash
Amazfit T-Rex 3
32GB (Approx. 26GB user-accessible for Music/Maps)
Battery1 specs
Battery CapacityKey
Google Pixel Watch 3 (45mm)
420 mAh (typical); Up to 24 hours (Always-on Display enabled); Up to 36 hours (Battery Saver mode)
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)
Design2 specs
Weight
Google Pixel Watch 3 (45mm)
37 g (without band)Winner
Amazfit T-Rex 3
68.3 g (without strap)
Water Resistance
Google Pixel Watch 3 (45mm)
5 ATM (ISO 22810:2010); IP68 (Dust and water resistant)
Amazfit T-Rex 3
10 ATM (100 meters); Freediving certified (EN13319) to 45m
Software1 specs
Operating System
Google Pixel Watch 3 (45mm)
Wear OS 5.0
Amazfit T-Rex 3
Zepp OS 4
Connectivity1 specs
Connectivity
Google Pixel Watch 3 (45mm)
4G LTE (optional); Wi-Fi 6 (802.11ax) 2.4GHz + 5GHz; Bluetooth 5.3; NFC; Ultra-Wideband (UWB)
Amazfit T-Rex 3
Wi-Fi (2.4GHz); Bluetooth 5.2; BLE
+Full specs, pros, and cons
Everything side-by-side with ratings and the full spec list.
Expand
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)
★4.4(1,794)Amazon
Amazfit T-Rex 3
★4.5(1,926)Amazon
| 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)
Rating:★4.4(1,794)Amazon
Compatibility:Android 10.0 or newer (requires Google Account and Pixel Watch app); Not compatible with iOS
Operating System:Wear OS 5.0
Case Size:45mm diameter x 12.3mm height
Case Material:100% recycled aluminum housing; Custom 3D Corning Gorilla Glass 5
Display Type:Actua Display (AMOLED LTPO); 1–60Hz responsive refresh rate; Peak brightness 2000 nits; Minimum 1 nit
Display Size:1.4 in (approx. 40% more screen area than Pixel Watch 2)
Resolution:456 x 456 pixels (320 ppi); DCI-P3 color
Always On Display:Yes
Water Resistance:5 ATM (ISO 22810:2010); IP68 (Dust and water resistant)
Durability:IP68 dust and water resistance rating; Custom 3D Corning Gorilla Glass 5
GPS:GPS, GLONASS, Galileo, BeiDou, QZSS
Connectivity:4G LTE (optional); Wi-Fi 6 (802.11ax) 2.4GHz + 5GHz; Bluetooth 5.3; NFC; Ultra-Wideband (UWB)
NFC Payments:Google Wallet
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
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)
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
Storage:32GB eMMC flash
Speaker Mic:Built-in speaker; Built-in microphone
Calls:Yes (Bluetooth); LTE models support standalone calls
Battery:420 mAh (typical); Up to 24 hours (Always-on Display enabled); Up to 36 hours (Battery Saver mode)
Charging:USB-C Fast Charging Cable (included); 0–50% in ~28 min; 0–80% in ~50 min; 0–100% in ~80 min
Weight:37 g (without band)
Band Sizes:Active Band: Small fits 150–185 mm wrists; Large fits 165–215 mm wrists
Extras:UWB for Watch Unlock and finding devices; Google Home control; Camera Remote for Pixel phones; Offline Google Maps; Recorder app
✓ Pros:
- • Significantly larger and brighter display (2000 nits) than predecessors
- • Advanced running metrics (stride, oscillation) without external pods
- • Unique 'Loss of Pulse Detection' safety feature (first-of-kind)
- • Deepest integration with Google ecosystem (Nest, Maps, Pixel Camera)
- • Fast charging helps offset the 24-hour daily battery cycle
✗ Cons:
- • Battery life rated for only 24h with AOD (daily charging required)
- • Strictly incompatible with iPhone (Android 10+ only)
- • Some advanced health insights require Fitbit Premium subscription
- • Uses proprietary charging pin connection (not standard Qi wireless)
As an Amazon Associate I earn from qualifying purchases.
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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
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Which one is better?
The Google Pixel Watch 3 (45mm) is the better buy for most people - its advanced running metrics crush the Amazfit T-Rex 3. That said, grab the T-Rex 3 if you prioritize battery life and ruggedness - it lasts 27 days compared to just 24 hours for the Pixel.
Who should buy each?
Choose the Google Pixel Watch 3 (45mm) if: you want a premium smartwatch experience with a stunning display, need advanced fitness tracking, or want seamless integration with the Google ecosystem. (1.31 oz weight)
Choose the Amazfit T-Rex 3 if: you need a smartwatch that lasts weeks on a single charge, enjoy outdoor activities with offline maps, or prefer a rugged design for harsh conditions. (2.41 oz weight)
Conclusion
There is no wrong answer here. Focus on the features you will use daily and pick the model that aligns with them.
Frequently Asked Questions
+Which has better value?
Google Pixel Watch 3 (45mm) excels if you value significantly larger and brighter display (2000 nits) than predecessors. Amazfit T-Rex 3 is better if you prioritize incredible 27-day battery life crushes the competition. 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.
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