Garmin fēnix 3 vs Garmin Forerunner 25

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fēnix 3 compared with Forerunner 25

	Garminfēnix 3	GarminForerunner 25
Overview
Released
Released	2015	2015
Display
Case sizes
Case sizes	51 mm	43.9 mm or 47 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 transflective memory-in-pixel display, 128 × 128 pixels; 18.5 × 18.5 mm in the small version and 23 × 23 mm in the large version.
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 and accelerometer; heart rate requires an optional ANT+ chest strap, and an optional foot pod is supported.
Health features
Health features	Steps and sleep tracking; no built-in optical heart-rate sensor.	Daily steps, automatic step goal, inactivity bar and sleep monitoring; heart-rate zones require a paired chest strap.
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.	Running pace, distance, personal records, Virtual Pacer, Auto Pause, Auto Lap and time, distance and run/walk alerts; indoor distance from its accelerometer.
Safety features
Safety features	–	Live Tracking shares a run through a paired compatible smartphone.
Battery and connections
Battery life (maker's claim)
Battery life (maker's claim)	Up to 42 days	Up to 70 days
Mobile data option
Mobile data option	No	No
Works with
Works with	iPhone and Android	iPhone and Android
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.	Small version up to eight weeks in watch mode or eight hours of GPS training; large version up to ten weeks or ten hours respectively.
Charging
Charging	Rechargeable 300 mAh lithium-ion battery with USB charging cable.	Rechargeable lithium-ion battery; charging and data cable supplied.
Connectivity
Connectivity	Bluetooth and ANT+; smart notifications, Connect IQ apps, Garmin Connect, LiveTrack through a paired phone and phone music controls.	Bluetooth Low Energy syncs to Garmin Connect Mobile and displays paired-phone notifications; 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	31 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.	Silicone band and 5 ATM water rating.
Size
Size	51 x 51 x 16 mm; 82 g.	Small version 35.9 × 43.9 × 13.9 mm, 31 g; large version 40.2 × 47 × 13.9 mm, 39 g. Longest case dimensions appear in the size comparison.
Colours
Colours	Grey case with black band.	Large versions in black/blue and black/red; small versions in black/violet and white/pink.
In the box
In the box	–	Watch, charging/data cable and manual; some bundles also included a heart-rate chest strap.