Garmin fenix 8 AMOLED vs Apple Watch Ultra 3
The Garmin fenix 8 AMOLED is the better watch on paper: it works with iPhone and Android and lasts longer (16 days). Pick the Apple Watch Ultra 3 only if it matters to you that it has satellite SOS.
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Key differences
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Battery life
Garmin fenix 8 AMOLED wins
The Garmin fenix 8 AMOLED lasts up to 16 days against 42 hours.
-
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
Evenly matched
Similar weight: 59 g and 61.6 g.
Other differences
- Phone Garmin fenix 8 AMOLED wins
Check your phone first: the Garmin fenix 8 AMOLED works with iPhone and Android and the Apple Watch Ultra 3 with iPhone only.
- Satellite Apple Watch Ultra 3 wins
The Apple Watch Ultra 3 can reach help by satellite where there is no phone signal.
Which one should you choose?
Choose the Garmin fenix 8 AMOLED if…
- You might switch phones one day: it pairs with iPhone and Android.
- You hate charging: it's rated for up to 16 days in smartwatch mode.
- You want to sleep better: it scores each night and tells you what to change.
Choose the Apple Watch Ultra 3 if…
- You use an iPhone: it is made for it.
- You go beyond phone coverage: it can send SOS by satellite.
- You want it to slide under a sleeve: it's 12 mm thick.
Full spec comparison
The Garmin fenix 8 AMOLED leads on phone and software and battery life, while the Apple Watch Ultra 3 leads on safety features.
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 | Apple Watch Ultra 3 |
|---|---|---|
| Brand | Garmin | Apple |
| Series | fēnix | Apple Watch Ultra |
| Released | — | 2025 |
| Versions | fēnix 8 (43 mm, AMOLED), fēnix 8 (51 mm, AMOLED) | Natural, Black |
| Colours | — | Natural, Black |
Platform & apps
The Garmin fenix 8 AMOLED is ahead on phone and software.
It works with iPhone and Android, and the Apple Watch Ultra 3 doesn't beat it on anything here.
| Spec | Garmin fenix 8 AMOLED | Apple Watch Ultra 3 |
|---|---|---|
| Operating system | Garmin | watchOS |
| Works with | iPhone and Android | iPhone only |
| Minimum iOS | — | iOS 26 |
| Chipset | — | S10 chip with 64-bit dual-core processor |
| Storage | 32 GB | 64 GB |
| App store | Yes | Yes |
| Subscription | — | Optional |
Display
The screens are closely matched.
| Spec | Garmin fenix 8 AMOLED | Apple Watch Ultra 3 |
|---|---|---|
| Display type | AMOLED | LTPO OLED |
| Display name | — | Always‑On Retina display |
| Screen size | 1.4 in | — |
| Resolution | 454 x 454 | 422 x 514 |
| Pixel density | — | 326 ppi |
| Peak brightness | — | 3,000 nits |
| Colour display | Yes | Yes |
| Always-on display | Yes | Yes |
| Touchscreen | Yes | — |
| Controls | touchscreen, buttons | touchscreen, buttons, crown, action button |
Design & durability
Each watch has its strengths on size and durability.
The Garmin fenix 8 AMOLED comes in 3 sizes, while the Apple Watch Ultra 3 is slimmer.
| Spec | Garmin fenix 8 AMOLED | Apple Watch Ultra 3 |
|---|---|---|
| Case sizes | 43 / 47 / 51 mm | 49 mm |
| Case shape | Round | Rectangular |
| Dimensions | 47 x 47 x 13.8 mm | 49 x 44 x 12 mm |
| Thickness | 13.8 mm | 12 mm |
| Weight (case) | 59 g | 61.6 g |
| Weight with band | 80 g | — |
| Case material | fiber-reinforced polymer with metal rear cover | Titanium, Grade 5 |
| Bezel material | stainless steel or titanium | — |
| Lens | Corning Gorilla Glass or sapphire crystal | sapphire |
| Back material | metal rear cover | — |
| Band material | silicone | — |
| Band width | 22 mm | — |
| Band fitting | QuickFit 22 mm | — |
| Fits wrists | 125-208 mm | 130-210 mm |
| Water resistance | 10 ATM | 10 ATM |
| IP rating | — | IP6X |
| Water standard | — | ISO 22810:2010 |
| MIL-STD-810 tested | — | Yes |
| Operating temperature | — | 0 to 35 °C |
| Max altitude | — | 9,000 m |
Battery
The Garmin fenix 8 AMOLED is ahead on battery life.
It lasts longer (16 days), and the Apple Watch Ultra 3 doesn't beat it on anything here.
| Spec | Garmin fenix 8 AMOLED | Apple Watch Ultra 3 |
|---|---|---|
| Battery (smartwatch mode) | 16 days | 42 hours |
| Battery (GPS) | 47 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: 42 hours; Battery saver: 3 days |
| Battery type | Lithium ion | Li-ion |
| Charging | proprietary-plug | puck |
| Wireless charging | — | Yes |
| Fast charging | — | 0-80% in about 45 minutes |
GPS & navigation
Both have built-in GPS with similar capabilities.
| Spec | Garmin fenix 8 AMOLED | Apple Watch Ultra 3 |
|---|---|---|
| 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 | — |
| Maps | Downloadable maps | Downloadable maps |
| Preloaded regions | — | U.S. national and regional parks |
| Navigation features | turn-by-turn, back-to-start, round-trip routing, climb planner, waypoints, course import | waypoints, back-to-start |
| Golf courses | 43,000 | — |
| Ski maps | Yes | — |
Health & sensors
The Garmin fenix 8 AMOLED is ahead on health tracking.
It tracks sleep in more depth, and the Apple Watch Ultra 3 doesn't beat it on anything here.
| Spec | Garmin fenix 8 AMOLED | Apple Watch Ultra 3 |
|---|---|---|
| Sensors | optical HR, SpO2, skin temperature, accelerometer, gyroscope, barometer, compass, ambient light, thermometer, depth | optical HR, ECG electrode, SpO2, skin temperature, accelerometer, gyroscope, compass, ambient light, depth, thermometer |
| Heart-rate sensor | Garmin Elevate | Third-generation optical heart sensor |
| Heart-rate tracking | 24/7 | 24/7 |
| ECG | Yes | Yes |
| Irregular rhythm alerts | — | Yes |
| High/low heart-rate alerts | Yes | Yes |
| Heart-rate variability | Yes | — |
| Blood oxygen (SpO2) | Yes | Yes |
| Skin temperature | Yes | Yes |
| Respiration rate | Yes | — |
| Hypertension alerts | — | Yes |
| Sleep tracking | Sleep coaching | Sleep score |
| Sleep apnea alerts | — | Yes |
| Stress tracking | Yes | — |
| Energy score | Body Battery | — |
| Readiness score | Training Readiness | — |
| Cycle tracking | Yes | Yes |
Safety
The Apple Watch Ultra 3 is ahead on safety features.
It has satellite SOS, and the Garmin fenix 8 AMOLED doesn't beat it on anything here.
| Spec | Garmin fenix 8 AMOLED | Apple Watch Ultra 3 |
|---|---|---|
| Emergency SOS | Via phone | Satellite |
| Fall detection | — | Yes |
| Crash detection | — | Yes |
| Incident detection | Yes | — |
| Satellite messaging | — | Yes |
| Live tracking | Yes | — |
| Siren | — | Yes |
Training
The Garmin fenix 8 AMOLED is ahead on training features.
It has more training metrics, and the Apple Watch Ultra 3 doesn't beat it on anything here.
| Spec | Garmin fenix 8 AMOLED | Apple Watch Ultra 3 |
|---|---|---|
| Auto activity detection | Yes | — |
| Triathlon / multisport | Yes | Yes |
| Swim tracking | Pool and open water | Pool |
| Underwater heart rate | Yes | — |
| Training metrics | VO2 max, training load, training effect, recovery time, race predictor, endurance score, lactate threshold, HRV status | VO2 max, training load |
| Adaptive coaching | Yes | — |
| Running dynamics | Yes | Yes |
| Wrist running power | Yes | Yes |
| Strength rep counting | Yes | — |
| Heart-rate broadcast | Yes | — |
| External sensors | ANT+, Bluetooth HR strap, power meter, foot pod, speed/cadence, bike radar/lights, golf club tags | power meter |
| Smart trainer control | Yes | — |
Smart features
The Apple Watch Ultra 3 is ahead on smart features.
It has more storage (64 GB), and the Garmin fenix 8 AMOLED doesn't beat it on anything here.
| Spec | Garmin fenix 8 AMOLED | Apple Watch Ultra 3 |
|---|---|---|
| Notifications | Yes | Yes |
| Message replies | Android | iPhone |
| Calls on the watch | Yes | Yes |
| Speaker | Yes | Yes |
| Microphone | Yes | Yes |
| Voice assistant | maker voice | Siri |
| Contactless payments | Yes | Yes |
| Payment service | Garmin Pay | Apple Pay |
| Cellular | — | 5G version available |
| Music storage | Yes | Yes |
| Wi-Fi | — | Wi-Fi 4 (802.11n) |
| Bluetooth | — | Bluetooth 5.3 |
| Ultra-wideband | — | Yes |
| 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 | Apple Watch Ultra 3 |
|---|---|---|
| Specialist modes | golf, tactical, marine, ski | golf, ski |
| Diving | Single-gas dive computer | Single-gas dive computer |
| Max dive depth | 40 m | 40 m |
| Dive standard | — | EN 13319 |
| Decompression model | Bühlmann ZHL-16c with Gradient Factors | — |
| Gases | air, nitrox | — |