Coros APEX 4 vs Garmin fenix 8 AMOLED
Both are good picks with different strengths. The Coros APEX 4 lasts longer (24 days) and has a sunlight-readable MIP screen, while the Garmin fenix 8 AMOLED has an AMOLED screen, works as a dive computer and is rated 10 ATM.
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Key differences
-
Battery life
Coros APEX 4 wins
The Coros APEX 4 lasts up to 24 days against 16 days.
-
GPS
Evenly matched
Both have built-in GPS with similar features.
-
Display
Garmin fenix 8 AMOLED wins
The Garmin fenix 8 AMOLED has an AMOLED screen against MIP.
-
Health
Evenly matched
Much the same health sensors.
-
Weight
Garmin fenix 8 AMOLED wins
The Garmin fenix 8 AMOLED is lighter: 59 g against 64 g.
Other differences
- Diving Garmin fenix 8 AMOLED wins
The Garmin fenix 8 AMOLED works as a dive computer (single-gas scuba); the Coros APEX 4 isn't a dive computer.
- Water rating Garmin fenix 8 AMOLED wins
The Garmin fenix 8 AMOLED is rated 10 ATM against 5 ATM, better for snorkelling and water sports.
Which one should you choose?
Choose the Coros APEX 4 if…
- You hate charging: it's rated for up to 24 days in smartwatch mode.
- You train outdoors in bright sun: its MIP-style screen stays readable and saves battery.
Choose the Garmin fenix 8 AMOLED if…
- You want a vivid, phone-like screen: it has AMOLED-class colour and contrast.
- You scuba or freedive: it has a proper dive mode.
- You snorkel, surf or swim in open water: it's rated 10 ATM.
Full spec comparison
The Coros APEX 4 leads on battery life, while the Garmin fenix 8 AMOLED leads on specialist modes and 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 | Coros APEX 4 | Garmin fenix 8 AMOLED |
|---|---|---|
| Brand | Coros | Garmin |
| Series | APEX | fēnix |
| Released | 2025-10 | — |
| Versions | APEX 4 (46mm), APEX 4 (42mm) | fēnix 8 (43 mm, AMOLED), fēnix 8 (51 mm, AMOLED) |
Platform & apps
Both work with the same phones and software.
| Spec | Coros APEX 4 | Garmin fenix 8 AMOLED |
|---|---|---|
| Operating system | Coros | Garmin |
| Works with | — | iPhone and Android |
| Storage | 32 GB | 32 GB |
| App store | — | Yes |
Display
On the display, it comes down to what you need.
The Garmin fenix 8 AMOLED has a bright, colourful AMOLED screen; the Coros APEX 4 uses MIP, easy to read in sunlight and light on the battery. The Coros APEX 4 has a sunlight-readable MIP screen, while the Garmin fenix 8 AMOLED has an AMOLED screen.
| Spec | Coros APEX 4 | Garmin fenix 8 AMOLED |
|---|---|---|
| Display type | MIP | AMOLED |
| Display name | 3rd Generation Memory-in-Pixel | — |
| Screen size | 1.3 in | 1.4 in |
| Resolution | 260 x 260 | 454 x 454 |
| Pixel density | 200 ppi | — |
| Colour display | Yes | Yes |
| Always-on display | Yes | Yes |
| Touchscreen | Yes | Yes |
| Controls | touchscreen, buttons, crown, action button | touchscreen, buttons |
Design & durability
The Garmin fenix 8 AMOLED is ahead on size and durability.
It is rated 10 ATM and comes in 3 sizes, and the Coros APEX 4 doesn't beat it on anything here.
| Spec | Coros APEX 4 | Garmin fenix 8 AMOLED |
|---|---|---|
| Case sizes | 42.6 / 46.2 mm | 43 / 47 / 51 mm |
| Case shape | — | Round |
| Dimensions | 46.2 x 46.2 x 13.7 mm | 47 x 47 x 13.8 mm |
| Thickness | 13.7 mm | 13.8 mm |
| Weight (case) | 64 g | 59 g |
| Weight with band | 64 g | 80 g |
| Case material | Fiber Reinforced Polymer | fiber-reinforced polymer with metal rear cover |
| Bezel material | Grade 5 Titanium Alloy | stainless steel or titanium |
| Lens | Sapphire Glass | Corning Gorilla Glass or sapphire crystal |
| Back material | — | metal rear cover |
| Band material | Silicone / Nylon | silicone |
| Band width | 24 mm | 22 mm |
| Band fitting | Quick Release | QuickFit 22 mm |
| Fits wrists | 140-215 mm | 125-208 mm |
| Water resistance | 5 ATM | 10 ATM |
| Operating temperature | -20 to 50 °C | — |
Battery
The Coros APEX 4 is ahead on battery life.
It lasts longer (24 days), and the Garmin fenix 8 AMOLED doesn't beat it on anything here.
| Spec | Coros APEX 4 | Garmin fenix 8 AMOLED |
|---|---|---|
| Battery (smartwatch mode) | 24 days | 16 days |
| Battery (GPS) | — | 47 hours |
| Battery (multi-band GPS) | 41 hours | 35 hours |
| All battery modes | Smartwatch: 24 days; All satellite systems: 2.2 days; Multi-band GPS: 41 hours; Multi-band GPS + music: 15 hours | 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 |
| Battery type | Lithium-ion | Lithium ion |
| Charging | USB-C | proprietary-plug |
| Full charge time | 120 min | — |
GPS & navigation
Both have built-in GPS with similar capabilities.
| Spec | Coros APEX 4 | Garmin fenix 8 AMOLED |
|---|---|---|
| GPS | Built-in | Built-in |
| Multi-band GPS | Yes | Yes |
| Satellite systems | GPS, GLONASS, Galileo, BeiDou, QZSS | GPS, GLONASS, Galileo, QZSS, BeiDou |
| Automatic GNSS mode | — | Yes |
| Maps | Downloadable maps | Downloadable maps |
| Navigation features | turn-by-turn, back-to-start, waypoints | turn-by-turn, back-to-start, round-trip routing, climb planner, waypoints, course import |
| 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 Coros APEX 4 doesn't beat it on anything here.
| Spec | Coros APEX 4 | Garmin fenix 8 AMOLED |
|---|---|---|
| Sensors | optical HR, accelerometer, gyroscope, barometer, compass, thermometer, SpO2, ECG electrode | optical HR, SpO2, skin temperature, accelerometer, gyroscope, barometer, compass, ambient light, thermometer, depth |
| Heart-rate sensor | — | Garmin Elevate |
| Heart-rate tracking | — | 24/7 |
| ECG | — | Yes |
| High/low heart-rate alerts | — | Yes |
| Heart-rate variability | Yes | Yes |
| Blood oxygen (SpO2) | Yes | Yes |
| Skin temperature | — | Yes |
| Respiration rate | — | Yes |
| Sleep tracking | Sleep stages | Sleep coaching |
| Stress tracking | Yes | Yes |
| Energy score | — | Body Battery |
| Readiness score | — | Training Readiness |
| Cycle tracking | — | Yes |
Safety
Both offer much the same safety features.
| Spec | Coros APEX 4 | Garmin fenix 8 AMOLED |
|---|---|---|
| Emergency SOS | — | Via phone |
| Incident detection | — | Yes |
| Live tracking | — | Yes |
Training
The Garmin fenix 8 AMOLED is ahead on training features.
It has more training metrics, and the Coros APEX 4 doesn't beat it on anything here.
| Spec | Coros APEX 4 | Garmin fenix 8 AMOLED |
|---|---|---|
| Auto activity detection | — | Yes |
| Triathlon / multisport | — | Yes |
| Swim tracking | — | Pool and open water |
| Underwater heart rate | Yes | Yes |
| Training metrics | VO2 max, training load, recovery time, race predictor, lactate threshold | VO2 max, training load, training effect, recovery time, race predictor, endurance score, lactate threshold, HRV status |
| Adaptive coaching | — | Yes |
| Running dynamics | — | Yes |
| Wrist running power | — | Yes |
| Strength rep counting | — | Yes |
| Heart-rate broadcast | — | Yes |
| External sensors | Bluetooth sensors | ANT+, Bluetooth HR strap, power meter, foot pod, speed/cadence, bike radar/lights, golf club tags |
| Smart trainer control | — | Yes |
Smart features
Both offer much the same smart features.
| Spec | Coros APEX 4 | Garmin fenix 8 AMOLED |
|---|---|---|
| Notifications | Yes | Yes |
| Message replies | — | Android |
| Calls on the watch | Yes | Yes |
| Speaker | Yes | Yes |
| Microphone | Yes | Yes |
| Voice assistant | — | maker voice |
| Contactless payments | — | Yes |
| Payment service | — | Garmin Pay |
| Music storage | Yes | Yes |
| Find my phone | Yes | Yes |
| Find my watch | Yes | Yes |
| Flashlight | — | Yes |
Diving, golf & more
The Garmin fenix 8 AMOLED is ahead on specialist modes.
It works as a dive computer, and the Coros APEX 4 doesn't beat it on anything here.
| Spec | Coros APEX 4 | Garmin fenix 8 AMOLED |
|---|---|---|
| Specialist modes | ski | golf, tactical, marine, ski |
| Diving | None | Single-gas dive computer |
| Max dive depth | — | 40 m |
| Decompression model | — | Bühlmann ZHL-16c with Gradient Factors |
| Gases | — | air, nitrox |