Was searching for accuracy in modern sleep trackers and smartwatches. Couldn’t find anything except a youtuber from Vienna which had an amazing confusion matrix to show in a video. All the articles I found where basically:”buy buy buy! Look at the features! Oh heres the affiliate link...”

I remember having a Polar heart monitor that said that my table had 67 beats per minute... best of class, so many features!

So I concur, ads are ruining everything.