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Garmin Forerunner 15 vs Garmin Forerunner 25

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

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GarminForerunner 15GarminForerunner 25
Overview
Released20142015
Display
Case sizes52 mm or 57 mm43.9 mm or 47 mm
PanelMemory-in-pixelMemory-in-pixel
Always-on displayYesYes
Display detailMonochrome 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.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
SensorsBuilt-in GPS; supports a chest-worn heart-rate monitor and optional ANT+ foot pod for indoor pace and distance.Built-in GPS and accelerometer; heart rate requires an optional ANT+ chest strap, and an optional foot pod is supported.
Health featuresDaily steps, calories and inactivity reminders; heart-rate recording requires the chest strap sold in some bundles.Daily steps, automatic step goal, inactivity bar and sleep monitoring; heart-rate zones require a paired chest strap.
Fitness featuresOutdoor pace, distance, personal records, Auto Lap, Auto Pause, Virtual Pacer and run/walk intervals; indoor distance requires the foot pod.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–Live Tracking shares a run through a paired compatible smartphone.
Battery and connections
Battery life (maker's claim)Up to 35 daysUp to 70 days
Mobile data optionNoNo
Works withNo phone pairingiPhone and Android
Battery life detailUp to five weeks in watch/activity-tracking mode or eight hours with GPS on.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.
ChargingRechargeable lithium-ion battery with a USB charging and data cable.Rechargeable lithium-ion battery; charging and data cable supplied.
ConnectivityUSB 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.Bluetooth Low Energy syncs to Garmin Connect Mobile and displays paired-phone notifications; ANT+ supports optional heart-rate and foot-pod accessories.
StorageSeven activities of on-watch history.Seven activities of on-watch history.
Design
Weight (lightest version)36 g31 g
SoftwareGarminGarmin
Case materialsPlastic case and band; 5 ATM water rating.Silicone band and 5 ATM water rating.
SizeSmall 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.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.
ColoursSmall black/green, teal/white and violet/white; large black/blue and red/black.Large versions in black/blue and black/red; small versions in black/violet and white/pink.
In the boxWatch, charging/data cable and manual; a chest heart-rate monitor was included in some bundles.Watch, charging/data cable and manual; some bundles also included a heart-rate chest strap.

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