Garmin fēnix 3 vs Garmin Forerunner 15

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fēnix 3 compared with Forerunner 15

	Garminfēnix 3	GarminForerunner 15
Overview
Released
Released	2015	2014
Display
Case sizes
Case sizes	51 mm	52 mm or 57 mm
Panel
Panel	Memory-in-pixel	Memory-in-pixel
Always-on display
Always-on display	Yes	Yes
Display detail
Display detail	1.2-inch (30.4 mm) sunlight-readable transflective colour MIP display, 218 x 218 pixels, with button controls.	Monochrome memory-in-pixel display, 55 × 32 pixels; 2.1 × 2.0 cm on the small version and 2.5 × 2.4 cm on the large version, with a backlight and four-button control.
Health and fitness
ECG
ECG	No	No
Blood oxygen
Blood oxygen	No	No
Skin temperature
Skin temperature	No	No
Sleep apnoea alerts
Sleep apnoea alerts	No	No
High blood pressure alerts
High blood pressure alerts	No	No
Body composition
Body composition	No	No
Fall detection
Fall detection	No	No
Crash detection
Crash detection	No	No
GPS
GPS	Single-band	Single-band
Water resistance
Water resistance	100 m (better)	50 m
Sensors
Sensors	GPS, GLONASS, barometric altimeter, three-axis compass and accelerometer. Heart rate requires an optional ANT+ sensor.	Built-in GPS; supports a chest-worn heart-rate monitor and optional ANT+ foot pod for indoor pace and distance.
Health features
Health features	Steps and sleep tracking; no built-in optical heart-rate sensor.	Daily steps, calories and inactivity reminders; heart-rate recording requires the chest strap sold in some bundles.
Fitness features
Fitness features	Running, cycling, pool and open-water swimming, triathlon, hiking and skiing profiles; breadcrumb courses, TracBack, VO2 max estimate, recovery advisor and race predictor when paired with a heart-rate sensor. Running dynamics require an HRM-Run strap.	Outdoor pace, distance, personal records, Auto Lap, Auto Pause, Virtual Pacer and run/walk intervals; indoor distance requires the foot pod.
Battery and connections
Battery life (maker's claim)
Battery life (maker's claim)	Up to 42 days	Up to 35 days
Mobile data option
Mobile data option	No	No
Works with
Works with	iPhone and Android	No phone pairing
Battery life detail
Battery life detail	Up to six weeks in watch mode, 20 hours in GPS training mode or 50 hours in UltraTrac mode, according to the grey model's specification.	Up to five weeks in watch/activity-tracking mode or eight hours with GPS on.
Charging
Charging	Rechargeable 300 mAh lithium-ion battery with USB charging cable.	Rechargeable lithium-ion battery with a USB charging and data cable.
Connectivity
Connectivity	Bluetooth and ANT+; smart notifications, Connect IQ apps, Garmin Connect, LiveTrack through a paired phone and phone music controls.	USB connection to a Mac or PC for Garmin Connect uploads; no Bluetooth or direct smartphone sync. ANT+ supports optional heart-rate and foot-pod accessories.
Storage
Storage	32 MB built-in memory, with 23 MB available; stores up to 1,000 waypoints, 50 routes and 100 saved tracks.	Seven activities of on-watch history.
Design
Weight (lightest version)
Weight (lightest version)	82 g	36 g (better)
Software
Software	Garmin	Garmin
Case materials
Case materials	Stainless steel EXO antenna/bezel and fibre-reinforced housing with silicone band; 10 ATM water rating.	Plastic case and band; 5 ATM water rating.
Size
Size	51 x 51 x 16 mm; 82 g.	Small 4.0 × 5.2 × 1.6 cm and 36 g; large 4.6 × 5.7 × 1.6 cm and 43 g. The longest case dimensions appear in the size comparison.
Colours
Colours	Grey case with black band.	Small black/green, teal/white and violet/white; large black/blue and red/black.
In the box
In the box	–	Watch, charging/data cable and manual; a chest heart-rate monitor was included in some bundles.