Honest Review of the COROS Pace 4 (Scientific Test)
In a Nutshell
The COROS Pace 4 excels in GPS tracking for running and cycling, delivering super-consistent signals on par with top Garmin and Suunto models, making it a strong sports watch recommendation despite occasional sudden deviations. Heart rate accuracy is good for indoor/outdoor cycling (0.97 correlation) but middling for running (cadence lock issues) and poor for weightlifting/sleep stages, so pair with a chest strap or biceps monitor for precision training. Prioritize it for GPS/battery over all-rounders like Apple Watch or Pixel if sleep/HR aren't key; avoid for sleep tracking—opt for Whoop, Oura, or Eight Sleep instead.
These notes were generated by AI and may contain inaccuracies.
I've always enjoyed using COROS products like the Pace 3 or the Pace 4. Generally positive, though I point out problems with data accuracy. COROS products do well in sports watch testing. Surprised to be ghosted by COROS and hear they don't think there's an audience fit. Their privilege, makes business sense. Surprised since I worked well with them, personally disappointed. Not angry, just disappointed. Still open to samples. Review delayed because I purchased the Pace 4 with my own money after others got pre-release units.
I'm Rob, post-doc scientist specializing in biological data analysis. No data filtering. Show all data as is.
Collected data on COROS Pace 4. Start with heart rate tracking. Reference: Polar H10 chest strap.
Indoor cycling: Horizontal axis reference HR, vertical Pace 4 HR. Perfect agreement on blue line. Most points close. Few below or above. Correlation 0.97 (very good, >0.9 preferred, 0.95+ ideal).
Individual sessions: Generally good agreement. Minor delays in HR changes, nothing major. Some deviation at starts, but minor. Nothing changes training.
Compares to competition (all tested devices): Pace 4 in upper middle class. Zoom to ≥0.95 correlation: Close to Pace 3. Better devices: Apple Watches, some Huawei, Amazfit Helio strap on biceps, Vertix 2 (limited), Pixel Watches. All ≥0.95 good enough for indoor cycling.
Running harder. Scatter plot good but deviations, e.g., high HR detection possibly cadence lock.
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