COROS APEX 4

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Shaped by years of relentless development and insight from the world’s best mountain athletes, APEX 4 delivers ultra-precise GPS, best in class battery, zero-lag mapping, a microphone and speaker, plus advanced training and recovery tools to help you take on your biggest goals.

ALPINE-GRADE ENGINEERING

LIGHTWEIGHT TITANIUM. REINFORCED LUGS. SAPPHIRE GLASS.

01
Grade 5 Titanium Bezel
02
Reinforced Lugs add strength and create a lightweight, comfortable feel
51g (46mm) and 44g (42mm) with the nylon band
03
Scratch-Resistant Sapphire Glass
3rd-Generation Memory-in-Pixel screen

RAZOR-SHARP ACCURACY, WITHOUT LIMITS

APEX 4 delivers industry-leading accuracy across GPS, pace, heart rate, and elevation tracking, along with the ultra-long battery life you have come to expect from COROS.

MORE DETAILED MAPS
LANDSCAPE
TOPOGRAPHIC
TURN-BY-TURN
TRAIL AND STREET NAMES
Two map layers with 15m zoom plus trail and street names keep you oriented on trails, in the city, or on the slopes.
Elevation
Calibrated for rapid weather changes and steep, technical terrain.
- Dual-range barometer
30x
Faster map and graphic rendering speeds.
GPS
Precision that holds true in dense forests, steep couloirs, and sheer alpine walls.
Battery
Long enough to last 100 miles around Mont Blanc, or linking up the Grand Traverse.
APEX 4 (46mm)
65
HRS
APEX 4 (42mm)
41
HRS
+ Vertical GPS Algorithms for challenging environments
*Endurance Satellite Mode1
Microphone
Record Voice Pins to capture beta on the wall or save a note-to-self during your long run to help be better prepared next time.
IN PLAIN SIGHT
APEX 4's 3rd generation always-on MIP display delivers deeper colors, stays sharp in full sun, deep snow, and shadows.
Speaker
Take hands-free calls and listen to your activity alerts out loud.

WHERE ENDURANCE MEETS ALTITUDE

Mountain sports have unique demands. APEX 4 has been designed to meet all of them.

TRAIL RUNNING
CLIMBING
SKIING
EFFORT PACE
Effort Pace tells you your equivalent pace on flat terrain so you know when to push, and when to dial back.
GLOBAL MAPS
Landscape and Topo map layers with street and trail names give you the information you need when you need it, even without cell service.
NAVIGATION
Turn-by-Turn directions, street names, POI's and Back to Start make sure you always know where you're headed, and where you've been.
RUNNING FITNESS
Find out Race Prediction times, and what zones to train in to improve specific abilities whether you're prepping for an ultra, or your next 5k all-out effort.

MOUNTAIN SPORT TRAINING SYSTEM

APEX 4 and the COROS app form a connected training system built for athletes who want to improve.

Training Status
Training Load
Base Fitness

Training Status tells you if you’re building, maintaining, or overreaching—so you stay in control across every season.

Training Load tracks how much work you’ve put in across runs, rides, climbs, and touring.

Base Fitness shows your long-term aerobic fitness.

RECOVERY AND READINESS HUB

SLEEP

Track your total sleep time, sleep phases, sleep quality, and naps.

HRV

Check your overnight HRV to see how your body is responding to training and stress.

DAILY STRESS

Track your body’s stress levels with a simple 1–100 score

RECOVERY TIMER

Recovery Timer shows when your body is ready for easy or hard training, helping you balance rest and effort.

TOOLS FOR THE ASCENT

Accurate data, zero-lag mapping, and incredible battery set you up for success, no matter the task at-hand.

YOUR ADVENTURE JOURNAL
Adventure Journal logs Voice Pins, terrain photos, and key details from your effort so you can review what you saw, said, and did. Plan better lines, adjust your strategy, and leverage more recon for your next big goal.
LONGER BATTERY
APEX 4 pairs an always-on, 3rd-gen MIP display with deeper colors and higher contrast—built to stay clear in sun, snow, or shadows. With up to 65 hours of All Systems GPS (46mm) or 41 hours (42mm), you'll have full confidence in your watch whether it's linking up the Grand Traverse, or the full loop around Mont Blanc.
VERTICAL GPS TRACKING
With our most accurate vertical GPS algorithm yet, dual-frequency tracking, a precision heart rate sensor, and a dual-range barometer for sharper elevation and weather data, you won't have to worry about any missing meters when your activity is finished.
FAST MAPPING
APEX 4’s real-time map engine renders instantly—delivering global landscape and topo maps with turn-by-turn guidance, trail names, and POIs.
BUILT-IN VOICE TOOLS
Take hands-free calls, record Voice Pins, or have your activity alerts played out-loud so you never have to break your attention.

THE EVOLUTION OF APEX

Explore APEX through the years.

APEX
OCT 2018
APEX Pro
SEP 2019
APEX 2
NOV 2022
APEX 4
OCT 2025

HELP ME CHOOSE

Which watch is right for you?

COROS PACE
COROS NOMAD
COROS APEX
COROS VERTIX
What You Do
Road running, track intervals, triathlons, and racing.
Multi-day hikes, off-grid adventures, fishing trips, and outdoor journaling.
Trail running, ski touring, alpine climbing, and steep vertical training.
Ultramarathons, mountaineering, big expeditions.
Who You Are
A runner, triathlete, or cyclist chasing speed and simplicity.
A weekend warrior who thrives off the grid—fishing, hiking, camping.
A mountain athlete training with purpose and precision.
An ultra-endurance athlete who needs a watch that goes the distance, and further.
Built For
Lightweight feel, GPS accuracy, high-performance, daily wear.
Rugged design, environmental awareness, and a mic for Voice Pins.
Titanium bezel, sapphire glass, speaker + mic, climbing carabiner + bike mount.
Full-metal case, best-in-class battery, extreme weather durability.
Made to Support
Fast workouts, structured road/triathlon training, running specific features.
Journal your trips, log Voice Pins, revisit routes and moments.
Climb, ski and trail running, route planning, and performance tracking.
Ultra-marathon specific training, multi-day (or week) projects, massive battery life, expedition planning.

Sync, Connect and Control

Easily link to apps like Strava and Apple Health, stay updated with calls and texts, and control your camera—all from your watch.

What's in the box

*USB-C charging cable not included.
All battery claims depend on feature usage such as music, backlight, navigation, and many other factors; actual results will vary. Lithium-ion batteries have limited recharge cycles and may show degradation over time. Battery life and charge cycles vary by use and settings. View our Battery Specifications for more detailed information.