Apple Watch Series 3 vs. Apple Watch Series 2 vs. Casio WSD-F20A vs. Fitbit Charge vs. Amazfit T-Rex

 
Watch Series 3
Watch Series 2
WSD-F20A
Charge
T-Rex
 AppleWatch Series 3Remove Buy NowAppleWatch Series 2Remove Buy NowCasioWSD-F20ARemove Buy NowFitbitChargeRemove Buy NowAmazfitT-RexRemove Buy Now

Basic Info

Suggested Price$329$269$399$130$140
Release20172016201820142019

Activity & Fitness

Calories
Cycling (Bicycling)
Distance
Heart
Oxygen
Sleep
Steps
Swim

Battery

Duration18 hours18 hours1 day7-10 days20 days
Rechargeable

Compatibility

Android
iOS
Windows PhoneNA
Mac
Windows

Connectivity

Bluetooth
Cellular
GPS
NFC
Wi-Fi

Display

Color
Resolution340 x 272 or 390 x 312340 x 272 or 390 x 312320 x 320NA360 x 360
Size1.5 inches or 1.65 inches1.5 inches or 1.65 inches1.32 inchesNA1.3 inches
TouchNA
TypeAMOLEDAMOLEDLCDOLEDAMOLED

Functions

Audio Speaker
Clock
Phone
Vibration
Voice

Hardware

Accelerometer
Barometer or Altimeter
Ultraviolet Sensor
Water Resistance5 ATM5ATM5 ATM1 ATM5 ATM

Notifications

Phone
Emails
Texts

Software

Operating SystemWatchOS 4Watch OSWear OSNABuild-in
Apps
Music

All Wearables