Why We Love It
Built for the mountains, the COROS APEX 4 is the ultimate trail running watch for athletes who live for elevation gain, technical terrain, and long hours on the dirt. From navigating ridge lines to tackling 100 km ultras, it delivers reliability and precision where it matters most. With rugged titanium strength, all-weather durability, and outstanding battery life, it thrives in wild conditions. Every feature feels designed for serious trail runners, accurate GPS in remote terrain, storm alerts before the weather turns, and recovery insights that keep you training smart between climbs.
Talk Nerdy To Me
The COROS APEX 4 pairs alpine-grade toughness with advanced trail technology. Its lightweight Grade 5 titanium bezel and sapphire glass protect a vivid 3rd generation Memory-In-Pixel touchscreen optimised for sunlight visibility on open ridge lines. With 30x faster map and graphic loading than the APEX 2, route navigation feels instant and responsive, even in dense bushland. Dual-frequency GPS ensures accuracy in deep valleys or rugged terrain, while advanced sensors (heart rate, blood oxygen SpO₂, ECG to measure HRV, dual-range barometer, water depth sensor and compass) keep you informed on altitude, effort, and recovery. Trail runners will appreciate storm and altitude alerts, nutrition reminders, and hands-free voice pins to mark key points mid-run, and even take hands-free calls with the built-in speaker. With up to 65 hours of GPS battery life and seamless syncing to Strava, TrainingPeaks, and COROS training plans, the APEX 4 is built to go the distance, wherever the trail leads.
Fast Facts
- Touch-screen display
- 42mm (GPS mode: up to 41 hrs)
- 46mm (GPS mode: up to 65 hrs)
- Dual-frequency GPS precision
- Grade 5 titanium bezel
- Optical heart rate, blood oxygen (SpO₂), ECG (measure HRV) sensors
- Dual-range barometer, water depth sensor, and compass
- Storm and altitude alerts
- Real-time weather, wind speed and air pressure
- Save up to 5 locations for real-time weather viewing
- Weight: 64g
- Wrist size compatibility: 140 – 215 mm (46mm)
- Wrist size compatibility: 135 – 205 mm (42mm)
| Specification | APEX 4 (46 mm) | APEX 4 (42 mm) |
|---|---|---|
| Dimensions & Weight | ||
| Dimensions | 46.2 × 46.2 × 15.5 mm | 42.6 × 42.6 × 15.8 mm |
| Weight |
Body: 44 g With silicone band: 64 g With nylon band: 52 g |
Body: 38 g With silicone band: 56 g With nylon band: 45 g |
| Navigation & Controls | ||
| Map Types | Landscape Maps (street & trail names, POIs), Topo Maps | |
| Navigation Features | Back-to-Start, Waypoints, Turn-by-Turn, Pins | |
| Hardware Controls | Digital Dial, Back Button, Action Key | |
| Touch Screen | Tap to select & swipe to navigate | |
| Battery & Charging | ||
| Endurance (GPS Mode) |
GPS: 65 hrs High GPS: 53 hrs Max GPS: 41 hrs |
GPS: 41 hrs High GPS: 34 hrs Max GPS: 26 hrs |
| Daily Use | Up to 24 days (Sleep, Daily Stress, Daily HR) | Up to 15 days (Sleep, Daily Stress, Daily HR) |
| Charging Time | About 1.5 hrs (15 °C–45 °C / 59 °F–113 F) | |
| Bands, Packaging & Connections | ||
| Band Width | 24 mm | 22 mm |
| Wrist Size Compatibility | Silicone: 140–215 mm; Nylon: 140–215 mm | Silicone: 135–205 mm; Nylon: 135–205 mm |
| Band Connection | Quick Release | |
| Packaging Material | Biodegradable & Recyclable | |
| Data Sync | Sync via Bluetooth to COROS app or directly to COROS server via Wi-Fi | |
| Music | Connect headphones via Bluetooth for music playback; 32 GB built-in storage | |
| Accessories | Supports Bluetooth accessories (no ANT+): POD, POD 2, Heart Rate Monitor, 3rd-party HR monitors, Gym Equipment, Power Meters, Bike Trainers, Bike Speed/Cadence Sensors. Camera control with GoPro, DJI, and Insta360. | |
| Display & Materials | ||
| Screen Size | 1.3 in | 1.2 in |
| Resolution | 260 × 260 px | 240 × 240 px |
| Display Type | 3rd-gen Memory-in-Pixel (MIP) touch screen | |
| Glass | Sapphire Glass | |
| Bezel & Backing | Titanium bezel & high-strength polymer backing | |
| Band Material | Nylon / Silicone | |
| GNSS & Durability | ||
| Satellites & Systems | GPS, GLONASS, GALILEO, BeiDou, QZSS | |
| Dual Frequency | Supports L1 + L5 | |
| Waterproof Rating | 5 ATM | |
| Operating Temp | −20 °C to 50 °C (−4 °F to 122 °F) | |
| Storage Temp | −20 °C to 60 °C (−4 °F to 140 °F) | |
| Charging Temp | 0 °C to 45 °C (32 °F to 113 °F) | |
| Sensors & Features | ||
| Audio & Calls | Speaker plays activity alerts (distance, pace, avg HR, etc.). Answer calls hands-free when connected to your phone. | |
| Pins | Pin types recognized in app via voice input (e.g., “Water”) | |
| Sensors | PPG (Optical HR), Barometric Altimeter, Accelerometer, Gyroscope, Electronic Compass, Temperature Sensors, Pulse Oximetry (SpO2), ECG, Dual Microphone (noise reduction), Water Depth Sensor | |
| Training (EvoLab) | Running Fitness Test, FTP Test, Training Load & Recommendation, Recovery Timer, Effort Pace, Resting HR, Metronome, HR Broadcast, Training Plans & Workouts | |
| Daily Features | Steps, Calories, Exercise Time, Messages & Call Notifications, Sleep Monitoring, Alarm, Timer, Stopwatch, Find My Phone/Watch, Screen Always On, All-day Stress, Safety Alerts, Weather, Environmental Weather Tracking (Focus Locations) | |
| Languages & Integrations | ||
| Languages | English, German, Spanish, French, Polish, Thai, Japanese, Korean, Portuguese, Italian, Russian, Simplified Chinese, Traditional Chinese | |
| Third-Party Apps | Strava, TrainingPeaks, Relive, Wikiloc, Apple Health, Final Surge, Google Health, Stryd, and more | |
| Activity Modes (Selection) | ||
| Run / Walk | Run, Indoor Run, Trail Run, Track Run, Hike, Walk | |
| Cycling | Road Bike, Indoor Bike, Gravel Bike, Mountain Bike | |
| Swimming | Open Water, Indoor Swim | |
| Climbing | Mtn Climb, Outdoor Climb (algorithm updates to GPS), Single Pitch Climb, Indoor Climb, Bouldering | |
| Water Sports | Rowing, Indoor Rowing, Flatwater, Whitewater, Windsurfing, Speedsurfing | |
| Cardio & Fitness | Aerobics, GPS Cardio, Indoor Cardio, Jumprope, Stair Climb, Elliptical, Yoga, Pilates, Boxing | |
| Sports & Snow | Badminton, Table Tennis, Basketball, Soccer/Football, Ski, Snowboarding, XC Ski, Ski Touring, Frisbee, Skateboard | |
| Multi-Sport | Triathlon, Multisport, Workouts, Custom Activity, + more | |
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Same Day Dispatch: Orders placed before 12 PM (AEST/AEDT, Melbourne AU time) on weekdays are usually dispatched same day*. Orders placed after this cutoff will head out the next business day.*This is a guideline, not a guarantee. While we do our best to ship orders out on time, dispatch may be delayed during peak periods, sales events, or due to unexpected courier or warehouse issues.
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Tech Item Exception
Watches, FORM goggles, headphones, heart rate monitors, recovery boots and similar tech items can only be returned if unopened and unconnected in original packaging.
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Items marked as FINAL SALE cannot be returned or exchanged unless faulty or covered by warranty.
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