Apple Watch Series 3 vs. Fitbit Ionic vs. Garmin 645 Music vs. Fitbit Alta HR vs. Fitbit Flex

 
Watch Series 3
Ionic
645 Music
Alta HR
Flex
 AppleWatch Series 3Remove Buy NowFitbitIonicRemove Buy NowGarmin645 MusicRemove Buy NowFitbitAlta HRRemove Buy NowFitbitFlexRemove Buy Now

Basic Info

Suggested Price$329$299$450$150$100
Release20172017201820172013

Activity & Fitness

Calories
Cycling (Bicycling)
Distance
Heart
Oxygen
Sleep
Steps
Swim

Battery

Duration18 hours4+ days7 days7 days5 days
Rechargeable

Compatibility

Android
iOS
Windows PhoneNA
Mac
Windows

Connectivity

Bluetooth
Cellular
GPS
NFC
Wi-Fi

Display

Color
Resolution340 x 272 or 390 x 312348x250240 x 240128 x 36NA
Size1.5 inches or 1.65 inches1.421.2 inches1.4 inchesNA
TouchNA
TypeAMOLEDOLEDMIPOLEDLED

Functions

Audio Speaker
Clock
Phone
Vibration
Voice

Hardware

Accelerometer
Barometer or Altimeter
Ultraviolet Sensor
Water Resistance5 ATM50m5 ATM1 ATM

Notifications

Phone
Emails
Texts

Software

Operating SystemWatchOS 4Fitbit OSNA
Apps
Music

All Wearables