[michaelje]

I’ve just completed a 6 month self comparison of the Whoop v4 and Watch S6 for cycling. I found for long endurance efforts they were surprisingly accurate to each other - but during intervals of intense exertion (eg a KOM/hill climb) often the Whoop would read my HR as ~40-60BPM lower while the watch would reflect an expected reading (160-180bpm). Sometimes after 1-2 mins the whoop would “catch up” but it would leave a giant drop in HR graphing for that interval.

This also lowered the avg HR for the workout on the whoop, as you noted. Happy to share an example comparison graph if you’re interested, just reach out.

For what it’s worth, I ended up cancelling the Whoop this month after trying twice to engage with their data team.

[kmonsen]

dcrainmaker had an article where he reviewed the whoop, he liked most things about it, except the accuracy. Without that the rest was meaningless.