Polar M400 vs. Fitbit Flex 2 vs. Michael Kors Grayson vs. Pebble Core vs. Polar A370 vs. Michael Kors Grayson

 
M400
Flex 2
Grayson
Core
A370
Grayson
 PolarM400Remove Buy NowFitbitFlex 2Remove Buy NowMichael KorsGraysonRemove Buy NowPebbleCoreRemove Buy NowPolarA370Remove Buy NowMichael KorsGraysonRemove Buy Now

Basic Info

Suggested Price$200$100$350$99$179.95$350
Release201420162018201620172018

Activity & Fitness

Calories
Cycling (Bicycling)NA
Distance
Heartn/a
Oxygen
SleepNA
Steps
Swim

Battery

Duration8 hours to 30 days5 days24 hoursNAUp to 3 days24 hours
Rechargeable

Compatibility

Android
iOSNA
Windows Phonen/an/aNA
MacNA
WindowsNA

Connectivity

Bluetooth
Cellular
GPS
NFC
Wi-Fi

Display

Colorn/a
Resolutionn/an/a453 x 454NA160 x 80453x454
Sizen/an/a1.39 inchesNA1.18 inches1.39 inches
Touchn/aNA
Typen/aLEDAMOLEDNATFT LCDAMOLED

Functions

Audio SpeakerAlerts only
Clock
PhoneNA
VibrationNA
Voice

Hardware

AccelerometerNA
Barometer or Altimeter
Ultraviolet Sensor
Water Resistance3 ATM5 ATM1 ATMNAWR301 ATM

Notifications

PhoneNA
EmailsNA
TextsNA

Software

Operating Systemn/an/aAndroid WearNAAndroid Wear
Apps
Music

All Wearables