I am trying to mimic as closely as possible iOS default system keyboard's font. Apparently, the family is HelveticaNeue but the weight is neither HelveticaNeue-Light (too light) nor HelveticaNeue (too heavy).
My research shows that default system iOS keyboard uses something called Dynamic Type with Optical scaling. Is this available to third party developers (outside Apple)? If not, how can I mimic default keyboard's Helvetica Neue weight?