If your WHOOP says rest and your Garmin says train, who do you trust?
Imagine this: Both devices on the same wrist, same night of sleep, same morning. One shows green, one shows red. And neither will tell you how it decided. That's not a hardware problem. It's an algorithm problem. Different weightings, different baseline calculations, different thresholds - all proprietary, all invisible. You're left choosing which black box feels more right today.
The reason we open-sourced the scoring algorithms in Open Wearables wasn't just philosophical. It's because conflicting scores are meaningless without context, and context requires transparency. When you can see exactly how a Resilience Score weights HRV versus sleep duration versus resting heart rate, you can actually reason about the discrepancy.
Has anyone else hit this? Curious whether people trust one device more than others and why.
Replies
Asa.team
I just ignore both and go by feel at this point. The number is useful when it matches how I feel, completely useless when it doesn't, which kind of defeats the purpose.
The open scoring thing is the right call though. Hard to trust something you can't interrogate.
@ng_junsheng This happens more often than people admit. Two devices, same data source, completely different conclusions. At that point it stops being about accuracy and becomes about interpretation.
@ng_junsheng @new_user___0932026a86e905cf4b2b7f7 Interesting that the issue isn’t hardware but algorithms. Most people assume one device is “better,” but it’s really just diffrent logic. That changes how you think about accuracy completely.
I probably wouldn't risk wearing two devices at the same time :D However, it's pretty simple in my case, since I'm sitting on my chair all day long, so I know that I need to train :D
I sometimes see that I get better sleep score from a ring than from a smart watch. I trust the ring because it is tightly secured on my finger rather than slightly loose on my wrist. I do think that the hardware and how it collects signals can make a difference, not just the algorithms.