Altimeter
YesHeart rate
Chest strap compatibleGPS
YesWaterproof
YesClock
YesSleep tracking
-Waterproofing
-Notifications
-Companion app platforms
-Altimeter
NoHeart rate
NoGPS
NoWaterproof
Water-resistant (50m)Clock
YesSleep tracking
YesWaterproofing
-Notifications
-Companion app platforms
-Altimeter
NoHeart rate
-GPS
NoWaterproof
Water-resistant to 150ftClock
YesSleep tracking
YesWaterproofing
-Notifications
-Companion app platforms
iOS, AndroidAltimeter
NoHeart rate
NoGPS
-Waterproof
-Clock
-Sleep tracking
-Waterproofing
164 ft. or 50 m.Notifications
-Companion app platforms
-Altimeter
NoHeart rate
No (but works with 3rd party trackers)GPS
NoWaterproof
Yes (3 meters)Clock
-Sleep tracking
-Waterproofing
-Notifications
-Companion app platforms
-