Device summary

COROS

APEX 4 42mm

Garmin

fēnix 9 43mm AMOLED

Full specifications

Full specifications
Basic information
Release year20252026
Starting price$429—
Display size1.2-inch1.3-inch
Dimensions42.6 mm × 42.6 mm × 14.0 mm43.0 mm × 43.0 mm × 13.8 mm
Weight44 g44 g
Front materialSapphire glass—
Back materialFiber-reinforced polymer—
Display
Display technologyMemory-in-Pixel (3rd gen MIP touch)AMOLED
Resolution240 × 240416 × 416
ProtectionSapphire glass—
Performance
ChipsetAll-satellite dual-frequency GNSS—
Storage32 GB—
Expandable storageNo—
Battery & charging
Charging standardMagnetic charging (<2 h). Daily use 15 days; all-systems GPS 34 h; dual-frequency GPS 26 h; Endurance all-systems 41 h (extended mode — not everyday life); music modes shorterGarmin proprietary clip / USB charging
Battery typeLithium-ionLithium-ion
Connectivity
CellularGPS / GLONASS / Galileo / BeiDou / QZSS (dual-frequency), Downloadable global Landscape / Topo maps, Speaker + dual microphone, ECG sensorGPS / multi-GNSS
Wi‑FiWi-Fi / COROS App—
BluetoothBluetoothBluetooth
NFC—Yes
Build & durability
FrameFiber-reinforced polymer; Grade 5 titanium bezelFiber-reinforced polymer; titanium bezel
Ingress protection5 ATM10 ATM

Key differences

The most meaningful measured gaps in size and weight — not an overall winner.

  • Display size

    fēnix 9 43mm AMOLED

    0.1 in larger display · minor difference

  • Height

    Very similar height

  • Width

    Very similar width

  • Thickness

    Very similar thickness

What these size differences mean

Calculated from the dimensions shown, rounded to 0.1 mm and 1 g. Percentages use the smaller measurement as the reference. Fold and rotation settings affect the dimensions compared.

  • fēnix 9 43mm AMOLED is 0.4 mm (0.9% relative to APEX 4 42mm) wider. Check this difference against the width of your current device and pocket opening.
  • fēnix 9 43mm AMOLED is 0.4 mm (0.9% relative to APEX 4 42mm) taller. This describes the body outline; screen diagonal alone does not tell you the overall size.
  • APEX 4 42mm is 0.2 mm (1.4% relative to fēnix 9 43mm AMOLED) thicker. Cases and camera protrusions can change the clearance you need.
  • A direct weight difference is not shown because comparable fixed device weights are unavailable or include a strap.

Use these figures to compare physical size. They do not establish one-handed reach, pocket fit, durability or an overall winner.

Sources and measurement notes

Sizometry compares published specifications and calculates differences. These are not hands-on measurements or tests of comfort, performance or pocket fit.

Check the exact model, year, region and configuration on the linked page. References may cover several variants. Folded and unfolded dimensions differ; cases and camera protrusions may change the space a device needs. Drawings share a relative scale and are not calibrated to life size on your screen.

APEX 4 42mm vs fēnix 9 43mm AMOLED Size Comparison