COROS announced the APEX 4 on October 15, 2025, after a teaser prompted speculation about names such as APEX 3 and APEX 3 Pro. The released watch is officially called APEX 4, comes in 42 mm and 46 mm sizes, and is positioned for mountain sports. Its battery estimates vary by size and GPS mode, so compare the mode-specific figures rather than treating one headline number as universal.
The pre-launch APEX 3 names were speculation, not evidence of a released APEX 3 that COROS later canceled. The COROS APEX 4 is a real, released mountain-sport GPS watch; COROS’s published specifications describe its capabilities but do not independently establish its accuracy or real-world endurance.
What happened to the teased APEX watch?
On September 26, 2025, Android Central reported that COROS was teasing an unnamed new APEX watch and described APEX 3 and APEX 3 Pro as speculative names. COROS announced the product as APEX 4 on October 15, 2025, and said it was available that day. The announcement established the final product name, but does not establish that a commercial APEX 3 existed or that COROS formally canceled one.
COROS positions the APEX line for mountain sports including trail running, climbing, and ski touring. Its announcement also describes hiking and other activity modes, mapping, vertical tracking, and training and recovery features.
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APEX 4 sizes, launch prices, and battery estimates
| Model | U.S. launch price | Endurance GPS | All Systems On/High | Dual Frequency | Daily use with sleep tracking and daily stress |
|---|---|---|---|---|---|
| 42 mm | $429 | 41 hours | 34 hours | 26 hours | 15 days |
| 46 mm | $479 | 65 hours | 53 hours | 41 hours | 24 days |
The prices are U.S. launch prices announced by COROS in 2025, not verified current retail prices. Battery estimates are from the COROS Help Center table updated September 22, 2026. COROS warns that actual consumption can be higher with backlight use, navigation, weak or lost satellite signal, and connected accessories.
The 42 mm model is the smaller option; the 46 mm model has higher estimates in each listed battery category. Choose based on fit, expected outing length, and the GPS mode you intend to use—not a single headline endurance number.
Construction, display, and navigation
COROS lists a Grade 5 titanium bezel, reinforced lugs, sapphire glass, and a third-generation always-on Memory-in-Pixel (MIP) display. The company emphasizes readability in sun, snow, and shadow. MIP is a different display choice from AMOLED; buyers should weigh outdoor readability and their own display preferences.
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COROS lists dual-frequency tracking, a dual-range barometer, enhanced vertical GPS algorithms, global topographic and landscape maps, trail and street names, points of interest, and turn-by-turn navigation. Its product information also describes route planning and support for GPX routes, including synchronization from services such as Strava and Komoot. These are manufacturer descriptions, not independent performance test results.
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Mountain-sport and connected features
COROS highlights tools for trail running, climbing, ski touring, and other activities, alongside training and recovery features such as training load, sleep, HRV, SpO2, and readiness. These are consumer-wearable metrics and should not be treated as medical diagnoses.
Rank #3
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The watch has a microphone and speaker. COROS says the microphone supports Voice Pins and the speaker supports activity alerts and hands-free calls. Hands-free calling is not evidence of standalone cellular service; the reviewed product information does not establish that the watch can make calls without a connected phone.
COROS says APEX 4 supports external sensors over Bluetooth Low Energy, including heart-rate monitors and cycling power sensors. Its product FAQ also states that payment is unsupported and that offline MP3 music is available. Check COROS’s current product information for compatibility and feature requirements before buying accessories or relying on a connected feature.
How to choose between the sizes
- Compare fit: Choose the case size that sits comfortably on your wrist and suits your preferences.
- Match battery mode to the outing: Use the mode-specific estimates in the table, not the launch headline alone.
- Consider your navigation needs: Decide whether onboard maps, route guidance, and points of interest fit your usual activities.
- Check current pricing: The listed dollar amounts are launch prices; verify current prices and availability before purchase.
Frequently Asked Questions
Was the COROS APEX 4 originally rumored to be called the APEX 3?
Yes. Before the announcement, APEX 3 and APEX 3 Pro were reported as speculative names for the teased APEX watch. COROS announced the released model as APEX 4. The available evidence does not show that a commercial APEX 3 existed or was formally canceled.
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What are the APEX 4 battery estimates by GPS mode?
The COROS Help Center table, updated September 22, 2026, lists 41, 34, and 26 hours for the 42 mm model in Endurance, All Systems On/High, and Dual Frequency modes, respectively. For the 46 mm model, it lists 65, 53, and 41 hours. Actual battery use varies with settings and conditions.
How much did the APEX 4 cost at launch?
COROS announced U.S. launch prices of $429 for 42 mm and $479 for 46 mm on October 15, 2025. These are historical launch prices, not a current price check.
Can the APEX 4 make calls without a phone?
COROS describes hands-free calls as a microphone-and-speaker feature, but the reviewed information does not establish standalone cellular calling. Do not assume the watch can make calls without a connected phone.
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- A FULL-FEATURED HEALTH TRACKER—Apple Watch Series 11 gives you invaluable insights about your body, right from your wrist. Take an ECG anytime* and get alerts for a high and low heart rate or an irregular rhythm*—so you can stay closer to your heart. You can also view your overnight health tracking metrics with the Vitals app* and be notified of possible sleep apnea.*
- KNOW YOUR SLEEP SCORE—With advanced sleep tracking, Series 11 gives you a daily sleep score. It’s an easy way to help measure and understand the quality of your sleep, so you can make it more restorative.
- GET HYPERTENSION NOTIFICATIONS—Did you know that Series 11 can spot signs of chronic high blood pressure? By analyzing how your blood vessels respond to beats of the heart, it can notify you of possible hypertension.*
- SAFETY FEATURES—A smartwatch that puts your safety first. Series 11 can detect a hard fall or severe car crash, automatically help connect you with emergency services, and notify your emergency contacts.* Check In can automatically notify a loved one when you’ve arrived at your destination.
- A POWERFUL FITNESS TRACKER—With advanced metrics and motivating features like Pacer, Heart Rate Zones, training load, and Workout Buddy powered by Apple Intelligence from your nearby iPhone*—Series 11 is made to help everyone stay active, from runners and hikers to strength-training enthusiasts.
Does the APEX 4 support external sensors?
COROS says the watch supports Bluetooth Low Energy external sensors, including heart-rate monitors and cycling power sensors. Check COROS’s current compatibility information for a specific sensor.
The Bottom Line
The COROS APEX 4 is the officially released mountain watch that followed speculation about an APEX 3 name. It combines an always-on MIP display, sapphire and titanium construction, mapping, navigation, and mountain-sport features. Battery estimates depend on size and GPS mode: consult COROS’s mode-specific figures, and treat the 2025 prices as launch prices rather than current retail pricing.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
