Besides carrying the entire design, one other important requirement for user interface fonts is adaptability. Fred Smeijers’ sturdy humanist sans Monitor was made especially for screen reading and comes in seven complete weights across three widths, normal to condensed.

In the right hands, Siri’s compact fit and gently contrasted forms offer versatility and a rich texture with a strong sense of identity. Four styles. If you wondered, Siri happens to not be named after the popular speech-based personal assistant, but rather its designer’s daughter.

A wide range of weight in two widths gives the typographer room to do a lot with a relatively few styles of Program. Its subtly softened contours and slit counters in its heavier weights make the face easy to recognize, and though its narrow styles diverge from their normal width counterparts, they remain a stylistic match.

Fabrizio Schiavi’s Sys family is drawn for legibility and density, and it’s extremely well hinted for working at small sizes. If you want to try it out but are still unsure, Sys 2.0’s Regular style makes David Sudweeks’ list of Almost Free Fonts, meaning you can get it for next to nothing.

Everything Łukasz Dziedzic touches is built for extensive variability in at least one dimension. FF Clan covers two: In seven weights from thin to ultra, and across six widths from compressed to extended, this robust sans fits anywhere, ever projecting contemporary style.