Garmin 645 Music vs. Garmin Vivosmart 3 vs. Polar Loop vs. Garmin Forerunner 45 vs. Amazfit T-Rex

 
645 Music
Vivosmart 3
Loop
Forerunner 45
T-Rex
 Garmin645 MusicRemove Buy NowGarminVivosmart 3Remove Buy NowPolarLoopRemove Buy NowGarminForerunner 45Remove Buy NowAmazfitT-RexRemove Buy Now

Basic Info

Suggested Price$450$139.99$100$199$140
Release20182017201320192019

Activity & Fitness

Calories
Cycling (Bicycling)
Distance
Heart
Oxygen
Sleep
Steps
Swim

Battery

Duration7 days5 days5 days7 days20 days
Rechargeable

Compatibility

Android
iOS
Windows PhoneNA
MacNA
WindowsNA

Connectivity

Bluetooth
Cellular
GPS
NFC
Wi-Fi

Display

Color
Resolution240 x 24064 x 128NA208 x 208360 x 360
Size1.2 inchesNANA1.04 inches1.3 inches
Touch
TypeMIPOLEDLEDLCDAMOLED

Functions

Audio Speaker
Clock
Phone
Vibration
Voice

Hardware

Accelerometer
Barometer or Altimeter
Ultraviolet Sensor
Water Resistance5 ATM5 ATM2 ATM5 ATM5 ATM

Notifications

Phone
Emails
Texts

Software

Operating SystemNABuilt-inBuild-in
Apps
Music

All Wearables