Coros APEX 4

Display: MIP, 1.3 in
Case sizes: 42.6 / 46.2 mm
Battery: 24 days
Water resistance: 5 ATM
Weight: 64 g

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Coros APEX 4 at a glance

Battery

Weeks between charges

Up to 24 days in smartwatch mode. 53 hours with GPS.
GPS

Multi-band GPS

Maps on the wrist. Runs and rides without your phone.
Display

MIP, 1.3 in

1.3 in, always-on option and touchscreen.
Health

Heart, sleep and more

Measures blood oxygen and HRV.
Phone & smart

Smart features

Music and calls.
Build

5 ATM water rating

64 g. 2 case sizes. Sapphire lens.

Coros APEX 4 full specifications

Overview

A sports watch from Coros, released in 2025.

Brand	Coros
Model	APEX 4
Series	APEX
Released	2025-10
Versions	APEX 4 (46mm), APEX 4 (42mm)

Platform & apps

Runs Coros.

Operating system	Coros
Storage	32 GB

Display

A memory-in-pixel screen: always on, easy to read in sunlight and very light on the battery.

1.3 in, always-on option and touchscreen.

Display type	MIP
Display name	3rd Generation Memory-in-Pixel
Screen size	1.3 in
Resolution	260 x 260
Pixel density	200 ppi
Colour display	Yes
Always-on display	Yes
Touchscreen	Yes
Controls	touchscreen, buttons, crown, action button

Design & durability

Comes in 2 case sizes (42.6, 46.2 mm) weighing 64 g.

Rated 5 ATM: fine for swimming laps and showers. A sapphire lens resists scratches.

Case sizes	42.6 / 46.2 mm
Dimensions	46.2 x 46.2 x 13.7 mm
Thickness	13.7 mm
Weight (case)	64 g
Weight with band	64 g
Case material	Fiber Reinforced Polymer
Bezel material	Grade 5 Titanium Alloy
Lens	Sapphire Glass
Band material	Silicone / Nylon
Band width	24 mm
Band fitting	Quick Release
Fits wrists	140-215 mm
Water resistance	5 ATM
Operating temperature	-20 to 50 °C

Battery

Weeks between charges: up to 24 days in smartwatch mode.

With GPS on, up to 53 hours, or 41 hours in multi-band mode. Makers test with their own settings, so treat these as best-case figures.

Battery (smartwatch mode)	24 days
Battery (multi-band GPS)	41 hours
All battery modes	Smartwatch: 24 days; All satellite systems: 2.2 days; Multi-band GPS: 41 hours; Multi-band GPS + music: 15 hours
Battery type	Lithium-ion
Charging	USB-C
Full charge time	120 min

GPS & navigation

Built-in multi-band GPS for accurate tracks, even near tall buildings and trees.

You can download maps to the watch.

GPS	Built-in
Multi-band GPS	Yes
Satellite systems	GPS, GLONASS, Galileo, BeiDou, QZSS
Maps	Downloadable maps
Navigation features	turn-by-turn, back-to-start, waypoints

Health & sensors

Tracks heart rate around the clock, plus blood oxygen and HRV.

For sleep, it offers sleep stages.

Sensors	optical HR, accelerometer, gyroscope, barometer, compass, thermometer, SpO2, ECG electrode
Heart-rate variability	Yes
Blood oxygen (SpO2)	Yes
Sleep tracking	Sleep stages
Stress tracking	Yes

Training

Underwater heart rate	Yes
Training metrics	VO2 max, training load, recovery time, race predictor, lactate threshold
External sensors	Bluetooth sensors

Smart features

Smart extras include music storage and calls on the wrist.

Notifications	Yes
Calls on the watch	Yes
Speaker	Yes
Microphone	Yes
Music storage	Yes
Find my phone	Yes
Find my watch	Yes

Diving, golf & more

Specialist modes	ski
Diving	None

Specs compiled from Coros's product pages and datasheets. Manufacturers revise hardware between versions, so check the version on the box. Spotted an error? Tell us.