Garmin fēnix 3 vs Garmin fēnix 7

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fēnix 3 compared with fēnix 7

	Garminfēnix 3	Garminfēnix 7
Overview
Released
Released	2015	January 2022
Display
Case sizes
Case sizes	51 mm	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.	1.3-inch (33.02 mm) transflective colour memory-in-pixel touchscreen, 260 x 260 pixels, with five buttons.
Screen protection
Screen protection	–	Corning Gorilla Glass 3.
Health and fitness
ECG
ECG	No	No
Blood oxygen
Blood oxygen	No	Yes
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	100 m
Sensors
Sensors	GPS, GLONASS, barometric altimeter, three-axis compass and accelerometer. Heart rate requires an optional ANT+ sensor.	GPS, GLONASS, Galileo, Garmin Elevate wrist heart rate, Pulse Ox, barometric altimeter, compass, gyroscope, accelerometer and thermometer. Standard edition lacks multi-band GPS.
Health features
Health features	Steps and sleep tracking; no built-in optical heart-rate sensor.	Pulse Ox for altitude or sleep monitoring, HRV status, sleep score, stress and Body Battery energy monitoring.
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, cycling, swimming and outdoor profiles; training readiness, PacePro, ClimbPro, real-time stamina and full-colour maps including downloadable TopoActive maps.
Safety features
Safety features	–	Incident detection and assistance require a paired smartphone.
Battery and connections
Battery life (maker's claim)
Battery life (maker's claim)	Up to 42 days	Up to 18 days
In low-power mode
In low-power mode	–	Up to 57 days
Mobile data option
Mobile data option	No	No
Works with
Works with	iPhone and Android	iPhone and Android
Storage
Storage	–	16 GB
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 18 days in smartwatch mode, 57 hours in GPS-only mode or 57 days in battery saver watch mode.
Charging
Charging	Rechargeable 300 mAh lithium-ion battery with USB charging cable.	Internal rechargeable lithium battery; standard edition has no solar lens.
Connectivity
Connectivity	Bluetooth and ANT+; smart notifications, Connect IQ apps, Garmin Connect, LiveTrack through a paired phone and phone music controls.	Bluetooth, ANT+ and Wi-Fi; Garmin Pay, Connect IQ, smart notifications and on-watch music storage for up to 2,000 songs.
Storage
Storage	32 MB built-in memory, with 23 MB available; stores up to 1,000 waypoints, 50 routes and 100 saved tracks.	–
Design
Weight (lightest version)
Weight (lightest version)	82 g	79 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.	Stainless steel bezel, fibre-reinforced polymer case with metal rear cover and silicone band; 10 ATM water rating.
Size
Size	51 x 51 x 16 mm; 82 g.	47 x 47 x 14.5 mm; 79 g with silicone band, 56 g case only.
Bands
Bands	–	QuickFit 22 mm band; silicone band fits wrists 125–208 mm.
Colours
Colours	Grey case with black band.	Silver bezel with graphite band.