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Who
San Francisco is a neo-grotesque sans-serif typeface made by Apple Inc.
When
It was first released to developers on November 18, 2014.
Where
It is system typeface of the Apple Watch, OS X and iOS with OS X El Capitan and iOS 9.
Who
Roboto is a neo-grotesque sans-serif typeface family developed by Google. Designer is Christian Robertson.
When
It was officially made available for free download on January 12, 2012, on the newly launched Android Design website.
Where
It is system typeface on the Android operating system, and since 2013 it is also the default font of other Google services such as Google+, Google Play, YouTube and Google Maps.