Bangle.js 2 Cutting Edge - new heart rate algorithm

That's great! Thanks for the graphs @user140377 it's really good to see some side by side results!

I wonder if some other activity guessing code could preselect this mode automatically from accelerometer data.

There is actually another binary library for activity guessing that could be added. I've been meaning to try it out though - it's an entirely 'black box' with just one function that you pass xyz values to, so I'm not too sure how good it is.

And is the hardfp version larger?

Yes, I just tried again - 233196 hard, 232156 soft. So it's another reason to try and keep softfp :)