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Wearable comparison

Amazfit T-Rex 3 vs OnePlus Watch 3

Compare battery life, health tracking, display and fit.

Compared products
01Selected
Amazfit T-Rex 3

Amazfit T-Rex 3

  • Screen: 480 × 480 pixels; 322 ppi.
  • Runs Zepp OS 6.
  • 700 mAh battery capacity.
  • Bluetooth 5.2.
  • 10 ATM.
KSh 33,000In Stock
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02
OnePlus Watch 3

OnePlus Watch 3

  • Screen: 466 × 466 pixels.
  • Qualcomm Snapdragon W5; BES2800BP MCU processor.
  • 2 GB RAM in this version.
  • 32 GB storage in this version.
  • Runs Wear OS by Google; RTOS.
KSh 33,000In Stock
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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
Amazfit Balance 2KSh 39,000
Amazfit Cheetah 2 ProKSh 28,000
2 of 4 products

Our quick verdict

The Amazfit T-Rex 3 lasts longer between charges (27 days vs 16 days), works with Android phones and iPhones and is lighter to wear all day, while the OnePlus Watch 3 has a premium titanium build, is slimmer and has a speaker.

Display

Amazfit T-Rex 3
480 × 480 pixels; 322 ppi
OnePlus Watch 3
466 × 466 pixels

Software

Amazfit T-Rex 3
Runs Zepp OS 6
OnePlus Watch 3
Runs Wear OS by Google; RTOS

Capacity

Amazfit T-Rex 3
700 mAh battery capacity
OnePlus Watch 3
648 mAh battery capacity

Portability

Amazfit T-Rex 3
68.3 g
OnePlus Watch 3
81 g

Water resistance

Amazfit T-Rex 3
10 ATM
OnePlus Watch 3
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 16 days).
  • Bigger battery: 700 mAh (vs 648 mAh).
  • Works with Android phones and iPhones.
  • Lighter: 68.3 g (vs 81 g).
  • Swimproof: water resistant to 100 m (vs 50 m).
  • Rated for free diving to 45 m.

OnePlus Watch 3

  • Titanium case (vs plastic case).
  • Speaker.
  • Bluetooth calling with a connected smartphone.
  • Slimmer: 11.75 mm thick (vs 13.75 mm).
  • Dual-band Wi-Fi (vs 2.4 GHz only).

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.

More topicsFewer topics
6 priorities selected.
How each product answers the selected priorities
PriorityAmazfit T-Rex 3OnePlus Watch 3
Battery life700 mAh battery648 mAh battery
Portability68.3 g81 g
Display1.5-inch OLED display, 322 ppi1.5-inch OLED display
SoftwareZepp OS 6Wear OS by Google
ConnectionsBluetooth 5.2Bluetooth 5.2
Water resistance10 ATMIP68 water and dust resistance

Detailed comparison

Explore the full specifications, section by section.

Display

Display specifications comparison
SpecificationAmazfit T-Rex 3OnePlus Watch 3
Display1.5-inch AMOLED1.50-inch LTPO AMOLED
Screen resolution480 × 480 pixels; 322 ppi466 × 466 pixels
Display protectionCorning Gorilla GlassSapphire crystal
Display features—2200 nits (peak)

Connectivity

Connectivity specifications comparison
SpecificationAmazfit T-Rex 3OnePlus Watch 3
Wi-FiWi-Fi 2.4 GHzWi-Fi 2.4 GHz + 5 GHz
BluetoothBluetooth 5.2 BLEBluetooth 5.2
Positioning / GNSSDual-band GNSS; 6 satellite positioning systemsDual-frequency L1 + L5; GPS; BeiDou; Galileo; GLONASS; QZSS
Network / cellular—No cellular connectivity
SIM / eSIM—No
NFC—Supported

Identity & design

Identity & design specifications comparison
SpecificationAmazfit T-Rex 3OnePlus Watch 3
BrandAmazfitOnePlus
ModelAmazfit T-Rex 3OnePlus Watch 3
Dimensions48.5 × 48.5 × 13.75 mm without heart-rate sensor base46.6 × 47.6 × 11.75 mm, excluding lugs and sensor area
Weight68.3 g without strap49.7 g without strap; 81 g with strap
Build materialsStainless-steel bezel; polymer middle frameTitanium bezel; stainless-steel case; sapphire crystal
Wrist size145–210 mm140–210 mm
Strap / band22 mm liquid silicone; pin buckleFluororubber strap with stainless-steel buckle; configuration dependent
Controls / buttons4 physical buttons; touchscreenRotating crown, action button, and touchscreen
Announced—2025, February 18

Performance & software

Performance & software specifications comparison
SpecificationAmazfit T-Rex 3OnePlus Watch 3
Operating systemZepp OS 6Wear OS by Google; RTOS
Processor—Qualcomm Snapdragon W5; BES2800BP MCU
RAM—2 GB
Storage—32 GB

Audio & communication

Audio & communication specifications comparison
SpecificationAmazfit T-Rex 3OnePlus Watch 3
SpeakerUnsupportedSupported
MicrophoneSupportedSupported
CallingUnsupportedBluetooth calling with a connected smartphone

Sensors, health & fitness

Sensors, health & fitness specifications comparison
SpecificationAmazfit T-Rex 3OnePlus Watch 3
SensorsBioTracker 6.0 PPG; accelerometer; gyroscope; geomagnetic sensor; barometric altimeter; ambient light; temperatureAccelerometer; gyroscope; optical heart-rate sensor; optical blood-oxygen sensor; geomagnetic sensor; ambient-light sensor; barometer; wrist-temperature sensor
Health & wellness features24-hour heart rate, SpO₂ and stress; one-tap measurement; PAI; breathing exercises; high and low heart-rate alerts; low SpO₂ alerts; high-altitude SpO₂ reminders60-second Health Check-In; Mind and Body; arterial-stiffness assessment; wrist temperature; heart-rate monitoring and alerts; SpO₂
Sleep trackingSleep stages including REM; naps; sleep breathing quality; sleep scoreDeep, light and REM sleep; awake time; sleep score; breathing rate; SpO₂; snoring-risk assessment
Sports / workout modes177 sports modes100+ sports modes
Training & outdoor featuresZepp Coach; PeakBeats; training templates; interval training; track running; trajectory correction; virtual pacer; offline maps; turn-by-turn navigation; route import; return navigation; route-deviation alerts; altitude assistant; compass; sunrise and sunset; moon phase; tides; storm warningsAerobic training effect; cardiorespiratory capacity; recovery time; heart-rate recovery; running form; track running
Diving / depth featuresFreediving to 45 m—

Battery & durability

Battery & durability specifications comparison
SpecificationAmazfit T-Rex 3OnePlus Watch 3
Battery capacity700 mAh ratedLi-Ion 648 mAh
Battery life27 days typical; 13 days heavy; 40 days Battery Saver; 81 days clock; 42 hours accurate GPS; 72 hours GPS power saver; 180 hours maximum GPSUp to 16 days power saver; 5 days smart mode; 3 days heavy use
ChargingMagnetic charging headCharging base with USB-C cable
Water resistance10 ATM5 ATM; IP68
Durability / certificationsEN 13319; ISO 6425; GB/T 18828 diving certificationsMIL-STD-810H

Compatibility

Compatibility specifications comparison
SpecificationAmazfit T-Rex 3OnePlus Watch 3
Phone compatibilityAndroid 7 or later; iOS 14 or laterAndroid 9.0 or later; GMS 23.45.23 or later
Companion appZeppOHealth
ColorsOnyx; Lava; GrayObsidian Titanium; Emerald Titanium

Additional specifications

Additional specifications specifications comparison
SpecificationAmazfit T-Rex 3OnePlus Watch 3
Case materialStainless-steel bezel; polymer frameStainless steel; titanium bezel
Pixels per inch322 ppi—
Peak brightness2,000 nits peak2,200 nits peak
Charging timeApproximately 3 hours—
Packing listWatch with standard strap; magnetic charging head; instruction manualWatch; charging base; strap; USB-C cable; safety guide; quick start guide
Smart recognition25 strength-training movements; 8 sports movementsRunning; walking; cycling; swimming; rowing machine; elliptical
Third-party fitness appsStrava; adidas Running; TrainingPeaks; komoot; Relive; Google Fit; Apple Health—
Release status—Available. Released 2025, March 03
Model numbers—OPWWE251
Card slot—No
Camera—No
3.5 mm headphone jack—No
USB—No
Radio—No
Network speed—No

Similarities

  • Both use Bluetooth 5.2.
  • Both have OLED displays.
  • Both have 1.5-inch screens.
  • Both connect over Bluetooth.
  • Both go up to 210 mm (wrist size).
  • Both have a microphone.

In summary

For most buyers the Amazfit T-Rex 3 is the better buy; the OnePlus Watch 3 makes sense if you want a premium titanium build.

Back to compared products ↑

In-stock alternatives

Huawei Watch GT 6 ProFor Amazfit T-Rex 3Huawei Watch GT 6 ProView product ↗Huawei Watch GT 5 ProFor Amazfit T-Rex 3Huawei Watch GT 5 ProView product ↗OnePlus Watch 4For OnePlus Watch 3OnePlus Watch 4View product ↗

Related comparisons

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