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

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Amazfit T-Rex

Apple Watch 3

Apple Watch 4

Polar A370

Polar Loop 2

Polar M430

Xiaomi Mi Watch

	Amazfit T-Rex Check Amazon	Apple Watch 3 Check Amazon	Apple Watch 4 Check Amazon	Polar A370 Check Amazon	Polar Loop 2 Check Amazon	Polar M430 Check Amazon	Xiaomi Mi Watch Check Amazon
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Price and Release Date
Suggested Price	$140	$199	$329	$179.95	$120	$255	$130
Release / Update	2019	2017	2018	2017	2015	2017	2020
Activity & Fitness
Calories
Distance
Heart					$
VO2max (Oxygen)
Sleep
Steps
Stress mgt
Female health
Skin temp
Breath rate
Battery
Duration	20 days	18 hours	Not yet	Up to 3 days	8 days (without notifications)	30 hours	14 Days
Rechargeable

Compatibility Support
Android
iOS
Windows Phone
Mac					n/a
Windows					n/a
Connectivity Support
Bluetooth
Cellular
GPS
NFC
Wi-Fi
Display
Color
Resolution	360 x 360	340 x 272 or 390 x 312	384 x 480	160 x 80		128x128	454 x 454
Size	1.3 inches	1.5 inches or 1.65 inches	1.78 inches	1.18 inches		1.4 inch	1.39 inches
Touch
Type	AMOLED	AMOLED	MicroLED	TFT LCD	LED	LCD	AMOLED
Functions
Audio Speaker
Clock
Phone
Vibration
Voice
Hardware
Accelerometer
Barometer or Altimeter
Ultraviolet Sensor
Water Resistance	5 ATM	5 ATM	Not yet	WR30	2 ATM	WR30	5 ATM
Notifications
Phone
Emails
Texts
Software
Operating System	Built-in	WatchOS 4	WatchOS 5		n/a		Built-in
Apps
Music
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