Polar and Suunto were like this in the 90s and 00s. And they offered fancy features for the time such as VO2max or EPOC. I wonder if any of their models still

Polar and Suunto were like this in the 90s and 00s. And they offered fancy features for the time such as VO2max or EPOC. I wonder if any of their models still work well without apps? Something to look at is https://github.com/jimmykane/quantified-self https://github.com/jimmykane/quantified-self