COROS APEX 4
COROS APEX 4 is a watch from 2025, sitting in the premium band at an indicative $429.
It reads 13 of the 33 signals this comparison tracks. Full coverage of activity. Nothing at all from body composition.
By sensor class: 5 at high accuracy and 3 at consumer grade. That grade is my classification of the hardware, not a lab test. Those readings come from an optical heart rate sensor, a GPS receiver, a barometer and an accelerometer.
Its 24 days per charge are the 17th longest of the 74 devices of its kind here that publish a figure. The transflective MIP screen can stay always on. Multi-band GPS. Rated 5ATM, fine for swimming. On top of the tracking it also handles music on the device and offline maps. Case size 46mm (also 42mm). No subscription is required.
Current premium trail/outdoor; 3rd-gen MIP, dual-freq GPS, offline maps; SpO2 not listed by DCR.
Key specs
What it tracks
Heart & vitals
Sleep
Activity
Fitness
Buying for battery life? See every device ranked by battery life
Turn a supported wearable into daily health scores
MyBodyAI reads Fitbit, Oura, Polar and Withings by logging in, and Garmin from a data export, then builds daily recovery, sleep, load and immune scores, a biological age estimate, and early warnings. Optional, and separate from this comparison.
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