Fitbit Flex 2 vs. Casio G-Shock GBA800 vs. Amazfit T-Rex vs. Garmin VivoActive 4 vs. Apple Watch Ultra

 
Flex 2
G-Shock GBA800
T-Rex
VivoActive 4
Watch Ultra
 FitbitFlex 2Remove Buy NowCasioG-Shock GBA800Remove Buy NowAmazfitT-RexRemove Buy NowGarminVivoActive 4Remove Buy NowAppleWatch UltraRemove Buy Now

Basic Info

Suggested Price$100$120$140$349$799
Release20162018201920192022

Activity & Fitness

Calories
Cycling (Bicycling)
Distance
Heart
Oxygen
Sleep
Steps
Swim

Battery

Duration5 days2 years20 days8 days36 hrs
Rechargeable

Compatibility

Android
iOS
Windows Phonen/a
Mac
Windows

Connectivity

Bluetooth
Cellular
GPS
NFC
Wi-Fi

Display

Colorn/a
Resolutionn/a360 x 360260 x 260502x410 pixels
Sizen/a1.3 inches1.3ionches1.92 inches
Touchn/a
TypeLEDAMOLEDMIP

Functions

Audio Speaker
ClockLTPO OLED Retina
Phone
Vibration
Voice

Hardware

Accelerometer
Barometer or Altimeter
Ultraviolet Sensor
Water Resistance5 ATM20 ATM5 ATM5 ATM10 ATM (100 Meters)

Notifications

Phone
Emails
Texts

Software

Operating Systemn/aBuild-inWear OSWatchOS 9
Apps
Music

All Wearables