Best free alternatives to

PT Root UI

ParaType released PT Root UI in 2018, designed by Vitaly Kuzmin as a four-weight sans for screens, interfaces and wayfinding. Its defining trick is uniwidth construction: every character keeps the same advance width from Light to Bold, so a label that turns bold on hover or focus never shifts the layout around it. The forms are compact, even in stroke and faintly DIN-like, with wide Latin Extended and Cyrillic coverage, several figure sets and stylistic alternates. The family is free under the SIL Open Font License, though it is not on Google Fonts. These free faces cover the same functional UI register and can be loaded straight from a CDN.

The closest font to PT Root UI
The quick brown fox jumps over the lazy dog
More fonts similar to PT Root UI
The quick brown fox jumps over the lazy dog
The quick brown fox jumps over the lazy dog
The quick brown fox jumps over the lazy dog
The quick brown fox jumps over the lazy dog
Pairings

Display + body that work together

Pages that earn the read
The display sets the register; the body follows through. When both halves of a pair pull in the same direction, the design disappears and the words come forward.
Modern · Editorial Golos Text + EB Garamond
The shape of a working week
A pairing is a relationship: one voice speaks first, the other answers, and the contrast between them sets the tone for the whole page.
Editorial · Modern Playfair Display + Golos Text
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FAQ

Common questions about PT Root UI alternatives

Is PT Root UI free?
Yes — PT Root UI is a free typeface from ParaType. Free under the SIL Open Font License; the four-weight family downloads directly from ParaType. If you need a similar font you can load from a CDN, the closest is Golos Text, available on Google Fonts.
What font is similar to PT Root UI?
Golos Text is the closest free match. Another ParaType release built for screens, with the same sober Latin-plus-Cyrillic construction and compact proportions, which makes it the nearest free sibling. Golos is softer and slightly wider, and it is not uniwidth, so bold text will reflow where PT Root UI would not.
Can I use Golos Text in commercial projects?
Yes — Golos Text is published under a free license on Google Fonts and can be used in commercial work. Confirm the license text at the source before shipping.