Fitbit Charge 2 vs. Fitbit Flex 2 vs. Fitbit Ionic vs. Casio WSD-F20A vs. Amazfit T-Rex

 
Charge 2
Flex 2
Ionic
WSD-F20A
T-Rex
 FitbitCharge 2Remove Buy NowFitbitFlex 2Remove Buy NowFitbitIonicRemove Buy NowCasioWSD-F20ARemove Buy NowAmazfitT-RexRemove Buy Now

Basic Info

Suggested Price$150$100$299$399$140
Release20162016201720182019

Activity & Fitness

Calories
Cycling (Bicycling)
Distance
Heart
Oxygen
Sleep
Steps
Swim

Battery

Duration5 days5 days4+ days1 day20 days
Rechargeable

Compatibility

Android
iOS
Windows Phonen/a
Mac
Windows

Connectivity

Bluetooth
Cellular
GPS
NFC
Wi-Fi

Display

Colorn/a
Resolutionn/an/a348x250320 x 320360 x 360
Sizen/an/a1.421.32 inches1.3 inches
Touchn/an/a
TypeOLEDLEDOLEDLCDAMOLED

Functions

Audio Speaker
Clock
Phone
Vibration
Voice

Hardware

Accelerometer
Barometer or Altimeter
Ultraviolet Sensor
Water Resistancen/a5 ATM50m5 ATM5 ATM

Notifications

Phone
Emails
Texts

Software

Operating Systemn/an/aFitbit OSWear OSBuild-in
Apps
Music

All Wearables