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Wearable comparison

AmazFit T-Rex Ultra vs Google Pixel Watch 4

Compare battery life, health tracking, display and fit.

Compared products
01Selected
AmazFit T-Rex Ultra

AmazFit T-Rex Ultra

  • Screen: 454 × 454 pixels, 326 ppi.
  • Runs Zepp OS 3.5.
  • 500 mAh battery capacity.
  • 2.3 GB storage.
  • Bluetooth 5.0.
KSh 47,000Out of Stock
02
Google Pixel Watch 4

Google Pixel Watch 4

  • Qualcomm Snapdragon W5 Gen 2; Cortex-M55 coprocessor processor.
  • 2 GB RAM in this version.
  • 32 GB storage in this version.
  • Runs Wear OS 6.
  • Wi-Fi 6 support.
KSh 44,500In Stock
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WHOOP Peak 5.0 SensorKSh 38,000
Amazfit T-Rex 3 ProKSh 55,000
Amazfit Balance 2KSh 39,000
Amazfit Balance 3KSh 48,000
Samsung Galaxy Watch Ultra 2025KSh 44,000
Samsung Galaxy Watch UltraKSh 45,000
Apple Watch Series 10KSh 47,000
2 of 4 products

Our quick verdict

The Google Pixel Watch 4 takes ECG heart-rhythm readings, is lighter to wear all day and has a brighter screen for outdoor use, while the AmazFit T-Rex Ultra works with Android phones and iPhones, has a larger 1.39-inch screen and is swimproof to 100 m.

Software

AmazFit T-Rex Ultra
Runs Zepp OS 3.5
Google Pixel Watch 4
Runs Wear OS 6

Battery life

AmazFit T-Rex Ultra
500 mAh battery
Google Pixel Watch 4
Up to 30 hours per charge

Portability

AmazFit T-Rex Ultra
89 g
Google Pixel Watch 4
31 g

Storage

AmazFit T-Rex Ultra
2.3 GB storage
Google Pixel Watch 4
32 GB storage

Display

AmazFit T-Rex Ultra
1.39-inch OLED display, 326 ppi
Google Pixel Watch 4
1.2-inch OLED display, 60 Hz, 320 ppi

Key differences

The main differences to help you choose.

AmazFit T-Rex Ultra

  • Larger 1.39-inch screen (vs 1.2-inch).
  • Works with Android phones and iPhones.
  • Swimproof: water resistant to 100 m (vs 50 m).
  • Water resistant to 10 ATM (vs 5 ATM).

Google Pixel Watch 4

  • Brighter display: up to 3,000 nits (vs 1,000).
  • Lighter: 31 g (vs 89 g).
  • ECG heart-rhythm readings.
  • More storage: 32 GB (vs 2.3 GB).
  • Speaker.
  • Syncs with third-party apps such as Strava and Apple Health.

What matters most to you?

Choose any priorities

How each product answers the questions buyers ask most. Tick a topic to add it, untick one to hide it.

6 priorities selected.
How each product answers the selected priorities
PriorityAmazFit T-Rex UltraGoogle Pixel Watch 4
Battery life500 mAh batteryUp to 30 hours per charge
Storage2.3 GB storage32 GB storage
Display1.39-inch OLED display, 326 ppi1.2-inch OLED display, 60 Hz, 320 ppi
SoftwareZepp OS 3.5Wear OS 6
Battery capacity500 mAh battery41 mm: 325 mAh
Water resistance10 ATMIP68 water and dust resistance

Detailed comparison

Explore the full specifications, section by section.

Display

Display specifications comparison
SpecificationAmazFit T-Rex UltraGoogle Pixel Watch 4
Display1.39-inch AMOLED41 mm: 1.2-inch; 45 mm: 1.4-inch Actua 360 LTPO AMOLED
Screen resolution454 × 454 pixels, 326 ppi41 mm: 408 × 408; 45 mm: 456 × 456 pixels; 320 ppi
Display protectionGlass3D Corning Gorilla Glass 5
Display featuresUp to 1,000 nits; Always-On Display; 120+ watch facesAlways-on display; 1–60 Hz; DCI-P3 colour

Connectivity

Connectivity specifications comparison
SpecificationAmazFit T-Rex UltraGoogle Pixel Watch 4
Wi-Fi2.4 GHz Wi-FiWi-Fi 802.11a/b/g/n/ac/ax; 2.4 GHz + 5 GHz
BluetoothBluetooth 5.0 BLEBluetooth 6.0
Positioning / GNSSBuilt-in dual-band L1/L5 positioning; six satellite systemsDual-band L1 + L5; GPS; Galileo; GLONASS; BeiDou; QZSS
Network / cellular—LTE and UMTS on cellular editions
SIM / eSIM—LTE edition: eSIM
NFC—Supported
Ultra Wideband (UWB)—Supported
Satellite features—Satellite SOS on LTE edition; regional availability

Identity & design

Identity & design specifications comparison
SpecificationAmazFit T-Rex UltraGoogle Pixel Watch 4
BrandAmazfitGoogle
ModelAmazfit T-Rex UltraGoogle Pixel Watch 4
Dimensions47.3 × 47.3 × 13.45 mm, excluding heart-rate sensor base41 mm or 45 mm diameter × 12.3 mm height
Weight89 g without strap41 mm: 31 g; 45 mm: 36.7 g, without band
Build materials316L stainless-steel bezel, back panel, bridge and buttons; polymer-alloy middle frameAluminum case
Wrist size140–205 mm41 mm: small 130–175 mm, large 165–210 mm; 45 mm: small 150–185 mm, large 165–215 mm
Strap / band22 mm silicone strap with classic pin buckleActive Band; fluoroelastomer
Controls / buttonsFour physical buttons; glass touchscreenHaptic crown; side button; touchscreen; Gen 3 premium haptics
Announced—2025, August 20

Performance & software

Performance & software specifications comparison
SpecificationAmazFit T-Rex UltraGoogle Pixel Watch 4
StorageUp to 2.3 GB available for music32 GB eMMC
Operating systemZepp OS 3.5Wear OS 6
Processor—Qualcomm Snapdragon W5 Gen 2; Cortex-M55 coprocessor
CPU—Quad-core (4x1.7 GHz Cortex-A53)
GPU—Adreno A702
RAM—2 GB SDRAM

Audio & communication

Audio & communication specifications comparison
SpecificationAmazFit T-Rex UltraGoogle Pixel Watch 4
SpeakerNo built-in speaker; audio through connected Bluetooth headphonesSupported
Microphone—Supported
Calling—Bluetooth calling; LTE model supports cellular and supported Satellite SOS emergency communication

Sensors, health & fitness

Sensors, health & fitness specifications comparison
SpecificationAmazFit T-Rex UltraGoogle Pixel Watch 4
SensorsBioTracker PPG biometric sensor with SpO₂; accelerometer; gyroscope; geomagnetic sensor; barometric altimeter; ambient-light sensorCompass; altimeter; red and infrared SpO₂ sensors; electrical ECG sensors; multipath optical heart-rate sensor; accelerometer; gyroscope; ambient-light sensor; cEDA skin-conductance sensor; far-field skin-temperature sensor; barometer; magnetometer
Health & wellness features24-hour heart-rate, blood-oxygen and stress monitoring; one-tap measurement; PAI; breathing exercises; health alertsContinuous heart rate; ECG; SpO₂; skin temperature; stress tracking; cEDA
Sleep trackingSleep stages including REM; naps; sleep schedule; breathing quality; sleep scoreSleep stages; sleep score; overnight health metrics
Sports / workout modes162 sports modes; smart recognition of 25 strength movements and 8 sports movements; freediving workoutsAutomatic activity detection and exercise tracking for running, weightlifting, tennis and other activities
Training & outdoor featuresOffline maps and route navigation; Zepp Coach; PeakBeats; Track Run; trajectory correction; Virtual Pacer; training templates and intervals; external heart-rate belt and cycling power meter; altitude, sun, moon and tide toolsOn-device GPS; custom run workouts; weekly mileage; advanced run metrics and form insights; cardio load, target cardio load, readiness and personalised coaching
Safety & emergency featuresStorm warnings; altitude blood-oxygen reminders; abnormal heart-rate, low-SpO₂ and high-stress alertsEmergency SOS; fall detection; safety check
Diving / depth featuresOutdoor and indoor freediving and spearfishing; depth and water-temperature data; rated to 30 m; EN13319 and ISO 6425 diving certifications—

Battery & durability

Battery & durability specifications comparison
SpecificationAmazFit T-Rex UltraGoogle Pixel Watch 4
Battery capacity500 mAh rated41 mm: 325 mAh; 45 mm: 455 mAh
Battery lifeTypical: up to 20 days; saver: 25 days; clock: 50 days; heavy: 9 days; accuracy GPS: 28 h; automatic GPS: 46 h; power-saving GPS: 58 h; endurance GPS: 80 h; low-temperature GPS: 10 h41 mm: 30 hours AOD, 48 hours Battery Saver; 45 mm: 40 hours AOD, 72 hours Battery Saver
ChargingMagnetic charging base; approximately 2 hoursUSB-C magnetic pin charging
Water resistance10 ATM; ISO 22810:20105 ATM; IP68
Durability / certificationsMud-resistant design; ultra-low-temperature mode down to −30 °C; SGS-certified 10 ATM testing; EN13319 and ISO 6425 diving certificationsIP68 ingress protection; Corning Gorilla Glass 5

Compatibility

Compatibility specifications comparison
SpecificationAmazFit T-Rex UltraGoogle Pixel Watch 4
Phone compatibilityAndroid 7.0 or later; iOS 12.0 or laterAndroid 11 or later; Google account
Companion appZepp AppGoogle Pixel Watch; Fitbit
ColorsAbyss Black; Sahara41 mm: Obsidian, Porcelain, Lemongrass, Iris; 45 mm: Obsidian, Porcelain, Moonstone

Additional specifications

Additional specifications specifications comparison
SpecificationAmazFit T-Rex UltraGoogle Pixel Watch 4
Case material—100% recycled aluminum
Pixels per inch—320 ppi
Peak brightness—3,000 nits peak; 1 nit minimum
Charging time—41 mm: 15/25/45 minutes to 50/80/100%; 45 mm: 15/30/60 minutes
Packing list—Watch; small and large bands; charging dock or cable; quick start guide
Third-party fitness apps—Google Play apps; Google Maps; Google Wallet; Google Assistant
Release status—Available. Released 2025, October 09
Card slot—No
Camera—No
3.5 mm headphone jack—No
USB—No
Radio—No
2G bands—GSM 850 / 900 / 1800 / 1900
3G bands—HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands—LTE
Network speed—HSPA, LTE

Similarities

  • Both have OLED displays.
  • Both have similar screen sizes (1.39 and 1.2 inches).
  • Both connect over Bluetooth.

In summary

Get the Google Pixel Watch 4 if you want ECG heart-rhythm readings and a lighter watch for all-day wear, or the AmazFit T-Rex Ultra if you would rather have a choice of Android phone or iPhone and a larger 1.39-inch screen.

Back to compared products ↑

In-stock alternatives

Apple Watch Series 10For AmazFit T-Rex UltraApple Watch Series 10View product ↗Amazfit Balance 3For AmazFit T-Rex UltraAmazfit Balance 3View product ↗Samsung Galaxy Watch UltraFor Google Pixel Watch 4Samsung Galaxy Watch UltraView product ↗Samsung Galaxy Watch Ultra 2025For Google Pixel Watch 4Samsung Galaxy Watch Ultra 2025View product ↗

Related comparisons

AmazFit T-Rex UltraWHOOP Peak 5.0 SensorAmazFit T-Rex UltraAmazfit T-Rex 3 ProAmazFit T-Rex UltraAmazfit Balance 2AmazFit T-Rex UltraAmazfit Balance 3AmazFit T-Rex UltraSamsung Galaxy Watch Ultra 2025AmazFit T-Rex UltraSamsung Galaxy Watch UltraAmazFit T-Rex UltraApple Watch Series 10AmazFit T-Rex UltraHuawei Watch 6 Pro 46 mmAmazFit FalconAmazFit T-Rex Ultra
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