update (3.6) free font set , specially designed for use in user interfaces. The font is optimized to achieve high definition for small to medium sized characters (less than 12px) when displayed on computer screens. Font Sources under a free license , which allows you to unlimitedly modify the font, use it, including for commercial purposes, printing and on sites on the Web.
The set includes over 2 glyphs. There are 9 character thickness options available (including 18 styles provided with italics). The Cyrillic character set is supported. The project is being developed by Rasmus Andersson, one of Spotify service (responsible for design and served as art director), also worked at Dropbox and Facebook.
The set provides support for 31 OpenType extensions, including auto-correction of characters depending on the surrounding context (for example, two characters “->” are displayed as a single arrow), tnum mode (output numbers with fixed character width), sups, numr and dnom modes (different superscripts and subscripts), frac mode (normalization of fractions of the form 1/3), case mode (alignment of glyphs depending on the case of characters, for example, the “*” sign in “*A” and “*a” will be exactly centered on the character ), alternative inscriptions of numbers (for example, several options for the design of "4", zero with and without strikethrough), etc.
The font is available in the form of both traditional styled font files (Bold Italic, Medium, etc.) and OpenType variable font format (Variable Font), in which the thickness, width, and other stylistic characteristics of a glyph can be arbitrarily changed. The font is adapted for use on the Web and including in woff2 format (CloudFlare CDN is used to speed up direct download).
Source: opennet.ru