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Very late response, but I don't know how useful it is anyway:
Compared to a Fitbit Versa 3, I usually get within 5-10bpm consistently. They both use the photosomethingorother sensor, but in case there was some secret algorithm Fitbit uses, here's a roughly what I've found:
Fitbit likes to draw their graphs as "landscape" as possible, with a thick line that hides how spikey it gets, but usually it has the exact same peaks and valleys as Bangle.
Attached are screenshots of the graphs of both while shoveling and using a snowblower on and off for about an hour and a half.
Peaks in the Fitbit graph are 117bpm, then 132, 132, 132.
Corresponding peaks in Gadgetbridge are 90bpm, then 127, 130, 137.
thinkpoop
@user157584
Thanks for the reply Gordon! I didn't realize that we weren't really comparing apples-to-apples. It sounds like it'll be most useful to gather a really good understanding of my resting heart rate and maybe my sleep heart rate, but that I should take it with a grain of salt when moving.
I'd be curious if someone else can comment on if light movement walking HRM tends to be accurate. Also, does it find its "groove" over the course of exercise (I.e. maybe the first few minutes of a 30-60 min walk might be a bit funky, but perhaps it settles into a rhythm once movement is detected)?