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Garmin fēnix vs Garmin Forerunner 25

Every spec side by side, from each maker's published figures.

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GarminfēnixGarminForerunner 25
Overview
Released20122015
Display
Case sizes49 mm43.9 mm or 47 mm
PanelLCDMemory-in-pixel
Always-on displayYesYes
Display detailTransflective monochrome LCD, 31 mm diameter and 70 × 70 pixels, with LED backlight and five physical buttons.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
ECGNoNo
Blood oxygenNoNo
Skin temperatureNoNo
Sleep apnoea alertsNoNo
High blood pressure alertsNoNo
Body compositionNoNo
Fall detectionNoNo
Crash detectionNoNo
GPSSingle-bandSingle-band
Water resistance50 m50 m
SensorsHigh-sensitivity GPS receiver, barometric altimeter, three-axis compass and temperature sensor. Optional ANT+ heart-rate, foot-pod, speed/cadence and tempe temperature sensors.Built-in GPS and accelerometer; heart rate requires an optional ANT+ chest strap, and an optional foot pod is supported.
Health features–Daily steps, automatic step goal, inactivity bar and sleep monitoring; heart-rate zones require a paired chest strap.
Fitness featuresOutdoor activity profiles including hiking, mountaineering, running and cycling; configurable data fields, Auto Pause, Auto Lap and training alerts. No optical wrist heart-rate sensor.Running pace, distance, personal records, Virtual Pacer, Auto Pause, Auto Lap and time, distance and run/walk alerts; indoor distance from its accelerometer.
Safety featuresWaypoint, route and breadcrumb navigation with TracBack; worldwide city basemap and paperless geocaching, without preloaded detailed maps or turn-by-turn routing.Live Tracking shares a run through a paired compatible smartphone.
Battery and connections
Battery life (maker's claim)Up to 42 daysUp to 70 days
Mobile data optionNoNo
Works withiPhoneiPhone and Android
Battery life detailRechargeable 500 mAh lithium-ion battery; up to six weeks in watch mode, two weeks with sensors always on, sixteen hours in normal GPS mode or fifty hours in UltraTrac according to the owner's manual.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.
ChargingUSB contact charging cradle and AC adapter.Rechargeable lithium-ion battery; charging and data cable supplied.
ConnectivityANT+ sensors and wireless sharing with compatible Garmin devices; Bluetooth Smart transfer to the BaseCamp Mobile iPhone app and USB computer transfer to BaseCamp or Garmin Connect.Bluetooth Low Energy syncs to Garmin Connect Mobile and displays paired-phone notifications; ANT+ supports optional heart-rate and foot-pod accessories.
Storage20 MB internal memory; 1,000 waypoints, fifty routes, 10,000 track points and 100 saved tracks.Seven activities of on-watch history.
Design
Weight (lightest version)82 g31 g
SoftwareGarminGarmin
Case materialsShock-resistant housing, mineral-glass lens and polyurethane wristband; 50 m water resistance.Silicone band and 5 ATM water rating.
Size49 × 49 × 17 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–Large versions in black/blue and black/red; small versions in black/violet and white/pink.
In the box–Watch, charging/data cable and manual; some bundles also included a heart-rate chest strap.

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