Among the newer fonts in my inventory is Apple’s San Francisco which is the default font on iOS devices and the new MacBook keyboards. This font replaced Helvetica Neue as Apple’s default font and for good reason. @Kadavy breaks down the improved performance on screens as well as other aspects of the font in his post soon after the font was introduced.
I’m not observant enough to see all the subtle design differences, but I am observant enough to know it looks good and to know where to download it. Apple has released both variants to this font and their respective weights for free on GitHub. I’d highly recommend adding it to your library today.