When I saw this I thought wow this is what I was looking for!
https://frederiqueconstant.com/analytics/
Got it today.
What a disappointment!!! Piece of crap doesn't work.
1. Can’t connect directly to my iphone 7 as it doesn’t have an old earphone jack, I have to use an adapter.
2. I connected it directly to an ipad which has the old style earphone jack.
3. Most of my watches have extreme difficulty getting a stable signal and this is on ANY position I have tried, top and bottom.
4. When I get a measurement I get a different value each time (same watch, same position) and I’m not talking decimals here but from +1sec to 9 sec or even -x to +y.
This is completely unusable and not working as advertised. AT ALL.