Garmin fenix 8 AMOLED vs Garmin fenix 9
The fenix 8 AMOLED is the better watch on paper: it lasts longer on GPS (47 hours) and lasts longer (16 days). Pick the fenix 9 only if it matters to you that it is lighter.
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Key differences
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Battery life
fenix 8 AMOLED wins
The Garmin fenix 8 AMOLED lasts up to 16 days against 10 days.
-
GPS
Evenly matched
Both have built-in GPS with similar features.
-
Display
Evenly matched
Both have AMOLED screens of a similar size.
-
Health
Evenly matched
Much the same health sensors.
-
Weight
fenix 9 wins
The Garmin fenix 9 is lighter: 44 g against 59 g.
Which one should you choose?
Choose the fenix 8 AMOLED if…
- You do long runs, rides or hikes: it's rated for 47 hours with GPS.
- You hate charging: it's rated for up to 16 days in smartwatch mode.
Choose the fenix 9 if…
- You wear it to bed or have small wrists: it weighs 44 g.
- You load music or maps onto the watch: it has 64 GB.
Full spec comparison
The fenix 8 AMOLED leads on battery life, while the fenix 9 leads on size and durability.
Green cells with a ✓ mark the better spec in that row. Tick "Show differences only" to hide the rows where they match.
Overview
| Spec | Garmin fenix 8 AMOLED | Garmin fenix 9 |
|---|---|---|
| Brand | Garmin | Garmin |
| Series | fēnix | fēnix |
| Versions | fēnix 8 (43 mm, AMOLED), fēnix 8 (51 mm, AMOLED) | fēnix 9 43 mm, fēnix 9 47 mm, fēnix 9 51 mm |
Platform & apps
Both work with the same phones and software.
| Spec | Garmin fenix 8 AMOLED | Garmin fenix 9 |
|---|---|---|
| Operating system | Garmin | Garmin |
| Works with | iPhone and Android | iPhone and Android |
| Storage | 32 GB | 64 GB |
| App store | Yes | Yes |
Display
The screens are closely matched.
| Spec | Garmin fenix 8 AMOLED | Garmin fenix 9 |
|---|---|---|
| Display type | AMOLED | AMOLED |
| Screen size | 1.4 in | 1.3 in |
| Resolution | 454 x 454 | 416 x 416 |
| Colour display | Yes | Yes |
| Always-on display | Yes | — |
| Touchscreen | Yes | Yes |
| Controls | touchscreen, buttons | touchscreen, buttons |
Design & durability
The fenix 9 is ahead on size and durability.
It is lighter, and the fenix 8 AMOLED doesn't beat it on anything here.
| Spec | Garmin fenix 8 AMOLED | Garmin fenix 9 |
|---|---|---|
| Case sizes | 43 / 47 / 51 mm | 43 / 47 / 51 mm |
| Case shape | Round | Round |
| Dimensions | 47 x 47 x 13.8 mm | 43 x 43 x 13.8 mm |
| Thickness | 13.8 mm | 13.8 mm |
| Weight (case) | 59 g | 44 g |
| Weight with band | 80 g | 61 g |
| Case material | fiber-reinforced polymer with metal rear cover | fiber-reinforced polymer with titanium rear cover |
| Bezel material | stainless steel or titanium | titanium |
| Lens | Corning Gorilla Glass or sapphire crystal | Sapphire crystal |
| Back material | metal rear cover | titanium |
| Band material | silicone | silicone |
| Band width | 22 mm | 20 mm |
| Band fitting | QuickFit 22 mm | QuickFit 20 mm |
| Fits wrists | 125-208 mm | 108-182 mm |
| Water resistance | 10 ATM | 10 ATM |
Battery
The fenix 8 AMOLED is ahead on battery life.
It lasts longer on GPS (47 hours) and lasts longer (16 days), and the fenix 9 doesn't beat it on anything here.
| Spec | Garmin fenix 8 AMOLED | Garmin fenix 9 |
|---|---|---|
| Battery (smartwatch mode) | 16 days | 10 days |
| Battery (GPS) | 47 hours | 22 hours |
| Battery (multi-band GPS) | 35 hours | — |
| All battery modes | Smartwatch: 16 days; Battery saver: 23 days; GPS: 47 hours; All satellite systems: 38 hours; Multi-band GPS: 35 hours; Multi-band GPS + music: 10 hours; Max battery GPS: 3.4 days | Smartwatch: 10 days; Battery saver: 15 days; GPS: 18 hours; GPS: 7 hours; Max battery GPS: 2 days; GPS: 22 hours; GPS: 15 hours; Max battery GPS: 10 days |
| Battery type | Lithium ion | Lithium ion |
| Charging | proprietary-plug | proprietary-plug |
GPS & navigation
Both have built-in GPS with similar capabilities.
| Spec | Garmin fenix 8 AMOLED | Garmin fenix 9 |
|---|---|---|
| GPS | Built-in | Built-in |
| Multi-band GPS | Yes | Yes |
| Satellite systems | GPS, GLONASS, Galileo, QZSS, BeiDou | GPS, GLONASS, Galileo, QZSS, BeiDou |
| Automatic GNSS mode | Yes | Yes |
| Maps | Downloadable maps | Preloaded maps |
| Navigation features | turn-by-turn, back-to-start, round-trip routing, climb planner, waypoints, course import | back-to-start, round-trip routing, climb planner, waypoints, point-to-point navigation, TracBack |
| Golf courses | 43,000 | 43,000 |
| Ski maps | Yes | Yes |
Health & sensors
Both track much the same health data.
Heart rate, sleep and the extra sensors line up closely.
| Spec | Garmin fenix 8 AMOLED | Garmin fenix 9 |
|---|---|---|
| Sensors | optical HR, SpO2, skin temperature, accelerometer, gyroscope, barometer, compass, ambient light, thermometer, depth | optical HR, SpO2, skin temperature, accelerometer, gyroscope, barometer, compass, ambient light, thermometer, depth |
| Heart-rate sensor | Garmin Elevate | Garmin Elevate |
| Heart-rate tracking | 24/7 | 24/7 |
| ECG | Yes | Yes |
| High/low heart-rate alerts | Yes | Yes |
| Heart-rate variability | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| Skin temperature | Yes | Yes |
| Respiration rate | Yes | Yes |
| Sleep tracking | Sleep coaching | Sleep coaching |
| Stress tracking | Yes | Yes |
| Energy score | Body Battery | Body Battery |
| Readiness score | Training Readiness | Training Readiness |
| Cycle tracking | Yes | Yes |
Safety
Both offer much the same safety features.
| Spec | Garmin fenix 8 AMOLED | Garmin fenix 9 |
|---|---|---|
| Emergency SOS | Via phone | Via phone |
| Incident detection | Yes | Yes |
| Live tracking | Yes | Yes |
Training
Training features are evenly matched.
| Spec | Garmin fenix 8 AMOLED | Garmin fenix 9 |
|---|---|---|
| Auto activity detection | Yes | Yes |
| Triathlon / multisport | Yes | Yes |
| Swim tracking | Pool and open water | Pool and open water |
| Underwater heart rate | Yes | Yes |
| Training metrics | VO2 max, training load, training effect, recovery time, race predictor, endurance score, lactate threshold, HRV status | VO2 max, training load, training effect, recovery time, race predictor, endurance score, lactate threshold, HRV status |
| Adaptive coaching | Yes | Yes |
| Running dynamics | Yes | Yes |
| Wrist running power | Yes | Yes |
| Strength rep counting | Yes | Yes |
| Heart-rate broadcast | Yes | Yes |
| External sensors | ANT+, Bluetooth HR strap, power meter, foot pod, speed/cadence, bike radar/lights, golf club tags | ANT+, power meter, foot pod, speed/cadence, bike radar/lights, golf club tags, external HRM |
| Smart trainer control | Yes | Yes |
Smart features
The fenix 9 is ahead on smart features.
It has more storage (64 GB), and the fenix 8 AMOLED doesn't beat it on anything here.
| Spec | Garmin fenix 8 AMOLED | Garmin fenix 9 |
|---|---|---|
| Notifications | Yes | Yes |
| Message replies | Android | Android |
| Calls on the watch | Yes | Yes |
| Speaker | Yes | Yes |
| Microphone | Yes | Yes |
| Voice assistant | maker voice | maker voice |
| Contactless payments | Yes | Yes |
| Payment service | Garmin Pay | Garmin Pay |
| Music storage | Yes | Yes |
| Wi-Fi | — | Wi-Fi |
| Find my phone | Yes | Yes |
| Find my watch | Yes | Yes |
| Flashlight | Yes | Yes |
Diving, golf & more
Neither has a specialist edge here.
| Spec | Garmin fenix 8 AMOLED | Garmin fenix 9 |
|---|---|---|
| Specialist modes | golf, tactical, marine, ski | golf, tactical, ski |
| Diving | Single-gas dive computer | Single-gas dive computer |
| Max dive depth | 40 m | 40 m |
| Decompression model | Bühlmann ZHL-16c with Gradient Factors | Bühlmann ZHL-16c with Gradient Factors |
| Gases | air, nitrox | air, nitrox |