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All Amazfit T-Rex vs. Apple Watch 3 vs. Apple Watch 4 vs. Polar A370 vs. Polar Loop 2 vs. Polar M430 vs. Polar Unite vs. Xiaomi Mi Watch
Amazfit T-Rex Apple Watch 3 Apple Watch 4 Polar A370 Polar Loop 2 Polar M430 Polar Unite Xiaomi Mi Watch

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Price and Release Date

Suggested Price$140$199$329$179.95$120$255$150$130
Release / Update20192017201820172015201720202020

Activity & Fitness

Calories
Distance
Heart$
VO2max (Oxygen)
Sleep
Steps
Stress mgt
Female health
Skin temp
Breath rate

Battery

Duration20 days18 hoursNot yetUp to 3 days8 days (without notifications)30 hours3 days14 Days
Rechargeable

Compatibility Support

Android
iOS
Windows Phone
Macn/a
Windowsn/a

Connectivity Support

Bluetooth
Cellular
GPS
NFC
Wi-Fi

Display

Color
Resolution360 x 360340 x 272 or 390 x 312384 x 480160 x 80128x128240 x 240454 x 454
Size1.3 inches1.5 inches or 1.65 inches1.78 inches1.18 inches1.4 inch1.7 inches1.39 inches
Touch
TypeAMOLEDAMOLEDMicroLEDTFT LCDLEDLCDOLEDAMOLED

Functions

Audio Speaker
Clock
Phone
Vibration
Voice

Hardware

Accelerometer
Barometer or Altimeter
Ultraviolet Sensor
Water Resistance5 ATM5 ATMNot yetWR302 ATMWR303 ATM5 ATM

Notifications

Phone
Emails
Texts

Software

Operating SystemBuilt-inWatchOS 4WatchOS 5n/aBuilt-inBuilt-in
Apps
Music

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