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Garmin fēnix 3 vs Garmin fēnix 8 AMOLED (47 mm, Sapphire)

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

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Garminfēnix 3Garminfēnix 8 AMOLED (47 mm, Sapphire)
Overview
Released2015August 2024
Display
Case sizes51 mm47 mm
PanelMemory-in-pixelOLED
Always-on displayYesYes
Display detail1.2-inch (30.4 mm) sunlight-readable transflective colour MIP display, 218 x 218 pixels, with button controls.1.4-inch (35.56 mm) AMOLED touchscreen, 454 x 454 pixels, with optional always-on mode and leakproof inductive buttons.
Screen protection–Sapphire crystal lens on this titanium edition.
Health and fitness
ECGNoYes
Blood oxygenNoYes
Skin temperatureNoYes
Sleep apnoea alertsNoNo
High blood pressure alertsNoNo
Body compositionNoNo
Fall detectionNoNo
Crash detectionNoNo
GPSSingle-bandDual-band (L1 and L5)
Water resistance100 m100 m
SensorsGPS, GLONASS, barometric altimeter, three-axis compass and accelerometer. Heart rate requires an optional ANT+ sensor.GPS, GLONASS, Galileo, QZSS and BeiDou with SatIQ multi-band positioning; Garmin Elevate wrist heart rate, Pulse Ox, barometric altimeter, compass, gyroscope, accelerometer, thermometer, ambient light and depth sensors.
Health featuresSteps and sleep tracking; no built-in optical heart-rate sensor.Pulse Ox, skin temperature, sleep and HRV tracking; ECG app where regionally available, subject to compatible phone app and watch software.
Fitness featuresRunning, 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.Sport-specific strength workouts, training readiness, endurance and hill scores, PacePro, ClimbPro, TopoActive maps, scuba and apnea dive activities; built-in LED flashlight.
Safety features–Incident detection and assistance require a paired smartphone.
Battery and connections
Battery life (maker's claim)Up to 42 daysUp to 16 days
In low-power mode–Up to 23 days
Mobile data optionNoNo
Works withiPhone and AndroidiPhone and Android
Storage–32 GB
Battery life detailUp 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 16 days in smartwatch mode, seven days with always-on display, 47 hours in GPS-only mode or 35 hours with all-systems multi-band GNSS.
ChargingRechargeable 300 mAh lithium-ion battery with USB charging cable.Rechargeable lithium-ion battery with Garmin proprietary plug charger.
ConnectivityBluetooth 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 and on-watch music. Speaker and microphone support calls and voice messaging through a paired phone; some offline voice commands work without one.
Storage32 MB built-in memory, with 23 MB available; stores up to 1,000 waypoints, 50 routes and 100 saved tracks.–
Design
Weight (lightest version)82 g73 g
SoftwareGarminGarmin
Case materialsStainless steel EXO antenna/bezel and fibre-reinforced housing with silicone band; 10 ATM water rating.Titanium bezel, fibre-reinforced polymer case with metal rear cover, sapphire crystal and silicone band; 10 ATM water rating and 40 m dive-rated case.
Size51 x 51 x 16 mm; 82 g.47 x 47 x 13.8 mm; 73 g with silicone band, 52 g case only.
Bands–QuickFit 22 mm band; silicone band fits wrists 125–208 mm.
ColoursGrey case with black band.Titanium with spark orange and graphite silicone band.

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