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All Amazfit T-Rex vs. Apple Watch 3 vs. Apple Watch 8 vs. Apple Watch SE (2022) vs. Apple Watch Ultra vs. Fitbit Charge 6 vs. Fitbit Inspire 3 vs. Fitbit Sense vs. Fitbit Sense 2 vs. Fossil Explorist vs. Fossil Q Grant vs. Fossil Q Machine vs. Garmin Garmin Vivofit Jr 3 vs. Garmin Garmin Vivosmart 5 vs. Garmin Instinct vs. Garmin Vivoactive HR vs. Polar Loop 2 vs. Polar M430
Amazfit T-Rex Apple Watch 3 Apple Watch 8 Apple Watch SE (2022) Apple Watch Ultra Fitbit Charge 6 Fitbit Inspire 3 Fitbit Sense Fitbit Sense 2 Fossil Explorist Fossil Q Grant Fossil Q Machine Garmin Garmin Vivofit Jr 3 Garmin Garmin Vivosmart 5 Garmin Instinct Garmin Vivoactive HR Polar Loop 2 Polar M430

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Price and Release Date

Suggested Price$140$199$499$249$799$159$100$324$300$255$175$175$90$150$300$250$120$255
Release / Update201920172022202220222023202220202022201820152018202020222018201620152017

Activity & Fitness

Calories
Distance
Heart$
VO2max (Oxygen)
Sleep
Steps
Stress mgt
Female health
Skin temp
Breath rate

Battery

Duration20 days18 hours18 hrsNot yet36 hrsUp to 7 days10 days6 Days6 days24 hours7 days1 year1 year7 days14 days13 hours to 8 days8 days (without notifications)30 hours
Rechargeable

Compatibility Support

Android
iOS
Windows Phone
Macn/an/an/a
WindowsYes n/an/an/a

Connectivity Support

Bluetooth
CellularOptional
GPS
NFC
Wi-Fi

Display

Colorn/a
Resolution360 x 360340 x 272 or 390 x 312484x396368 x 448 pixels502×410 pixels39,32x18,6360 x 360336x336454 x 454n/a112x1120.43x0.79128 x 128148 x 205128x128
Size1.3 inches1.5 inches or 1.65 inches1.9 inches40mm1.92 inches1.04-inch AMOLED1,46 inches1.58 inches1,59 inches1.4 inchesn/a0.79 inches0.84 inches0.9 inches1.38 inches1.4 inch
Touchn/a
TypeAMOLEDAMOLEDOLEDLTPO OLED RetinaLTPO OLED RetinaAMOLEDAMOLEDAMOLEDAMOLEDAMOLEDn/aMIPOLEDAMOLEDLEDLCD

Functions

Audio Speaker
Clock
Phone
Vibration
Voice

Hardware

Accelerometer
Barometer or Altimeter
Ultraviolet Sensor
Water Resistance5 ATM5 ATM5 ATM (50 Meters)5 ATM (50 Meters)10 ATM (100 Meters)Water-resistant up to 50m5 ATM (50 Meters)5 ATM5 ATM (50 Meters)IP673 ATM5 ATM5 ATM (50 Meters)5 ATM (50 Meters)10 ATM (100 Meters)5 ATM2 ATMWR30

Notifications

Phone
Emails
Texts

Software

Operating SystemBuilt-inWatchOS 4WatchOS 9WatchOS 8.1WatchOS 9Fitbit OSFitbit OSFitbit OSFitbit OSWear OSn/aGarmin Watch OSn/a
Apps
Music

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