Roboto

Roboto is a sans-serif font. It goes well with Open Sans, Lato, Roboto Slab, Playfair Display, Futura PT, Montserrat, Abel, Helvetica, Museo Sans and Merriweather. If you're thinking about using Roboto then try Give 21px a shot for content.

People commonly tag it as design, writing, tech, agency, marketing, clean, blog, social, modern and data. You can get it from Font Squirrel, Google Web Fonts and Typekit.