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

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

Better figure, where one is clearly better

Garminfēnix 3 HRGarminfēnix 8 AMOLED (47 mm, Sapphire)
Overview
Released2016August 2024
Display
Case sizes51.5 mm47 mm
PanelMemory-in-pixelOLED
Always-on displayYesYes
Display detail1.2-inch (30.4 mm) 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 protectionDomed sapphire lens.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, Garmin Elevate optical wrist heart rate, barometric altimeter, three-axis compass and accelerometer.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 featuresAll-day heart rate, steps and sleep tracking; intensity minutes.Pulse Ox, skin temperature, sleep and HRV tracking; ECG app where regionally available, subject to compatible phone app and watch software.
Fitness featuresRunning, cycling, swimming, triathlon, hiking, skiing, golf and rowing profiles; breadcrumb courses and TracBack; VO2 max estimate, recovery advisor and race predictor. Stride length, ground-contact balance and vertical ratio require a compatible chest 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 14 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 two weeks in smartwatch mode with 24/7 heart rate, 16 hours in GPS training mode or 40 hours in UltraTrac mode. Garmin's launch release also stated up to three weeks in watch mode without the same smartwatch use.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, ANT+ and Wi-Fi; smart notifications, Connect IQ, Garmin Connect and LiveTrack through a paired phone.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; up to 1,000 waypoints and 30 routes.–
Design
Weight (lightest version)86.1 g73 g
SoftwareGarminGarmin
Case materialsPVD stainless steel bezel and buttons, reinforced housing and treated 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.
Size51.5 x 51.5 x 16 mm; 86.1 g with silicone band.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.
ColoursDark grey case with black silicone band.Titanium with spark orange and graphite silicone band.

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