Altimeter
NoHeart rate
NoGPS
NoClock
YesWaterproof
Water-resistant (50m)Sleep tracking
YesBattery Life
-Silent alarm
-Waterproofing
-Companion app platforms
-Altimeter
YesHeart rate
YesGPS
Uses smartphone GPSClock
YesWaterproof
-Sleep tracking
-Battery Life
-Silent alarm
-Waterproofing
Water-resistantCompanion app platforms
-Altimeter
YesHeart rate
YesGPS
YesClock
YesWaterproof
NoSleep tracking
YesBattery Life
7 daysSilent alarm
YesWaterproofing
-Companion app platforms
iOS, Android, WindowsAltimeter
YesHeart rate
YesGPS
Uses smartphone GPSClock
YesWaterproof
NoSleep tracking
YesBattery Life
4 daysSilent alarm
YesWaterproofing
-Companion app platforms
iOS, AndroidAltimeter
NoHeart rate
NoGPS
NoClock
YesWaterproof
-Sleep tracking
YesBattery Life
-Silent alarm
-Waterproofing
Water resistantCompanion app platforms
Android, iOS, WindowsAltimeter
NoHeart rate
No (but works with 3rd party trackers)GPS
NoClock
-Waterproof
Yes (3 meters)Sleep tracking
-Battery Life
-Silent alarm
-Waterproofing
-Companion app platforms
-