Altimeter
YesHeart rate
YesClock
YesWaterproofing
Splash-resistantSleep tracking
Yes GPS
-Waterproof
-Companion app platforms
-Battery Life
-Silent alarm
-Altimeter
YesHeart rate
Chest strap compatibleClock
YesWaterproofing
-Sleep tracking
-GPS
YesWaterproof
YesCompanion app platforms
-Battery Life
-Silent alarm
-Altimeter
YesHeart rate
YesClock
YesWaterproofing
Water-resistantSleep tracking
-GPS
Uses smartphone GPSWaterproof
-Companion app platforms
-Battery Life
-Silent alarm
-Altimeter
YesHeart rate
YesClock
YesWaterproofing
-Sleep tracking
YesGPS
Uses smartphone GPSWaterproof
NoCompanion app platforms
iOS, AndroidBattery Life
4 daysSilent alarm
YesAltimeter
YesHeart rate
YesClock
YesWaterproofing
-Sleep tracking
YesGPS
YesWaterproof
NoCompanion app platforms
iOS, Android, WindowsBattery Life
7 daysSilent alarm
YesAltimeter
NoHeart rate
NoClock
YesWaterproofing
Water resistantSleep tracking
YesGPS
NoWaterproof
-Companion app platforms
Android, iOS, WindowsBattery Life
-Silent alarm
-Altimeter
YesHeart rate
NoClock
NoWaterproofing
Fabric yes, after removing sensorsSleep tracking
-GPS
Uses smartphone GPSWaterproof
-Companion app platforms
iOS, Android, Windows Phone, webBattery Life
-Silent alarm
-