Manrope, by Mikhail Sharanda, is a free and variable sans serif font. It might be interesting for screen interface and fast load times, because it is a variable font.

Image of the letters il1 coe from Manrope font to see how good each letter is to be distinguished on a screen.
The il1 coe test of Manrope to distinguish letters is not ideal, but probably sufficient. The letters Il1 are very close to each other and the apertures could be more open to qualify for screen interface usage.

Mikhail describes his font as:

This font is a crossover of different font types: it is semi-condensed, semi-rounded, semi-geometric, semi-din, semi-grotesque. It employs minimal stroke thickness variations and a semi-closed aperture. The fourth version of the font comes in a Variable Font format, and 7 legacy weights.