Picking Open Latin Fonts: OFL Choices for Body, UI, Display and Code

Latin open fonts live mostly under SIL OFL 1.1, occasionally Apache 2.0 (Roboto); both are essentially friction-free for commercial work, differing only in modification and redistribution duties. The real variable is purpose: body asks for x-height, apertures and reading rhythm; UI wants legibility at small sizes plus robust figures; display wants geometry and weight ladders; code wants disambiguation and punctuation quality. One face rarely wins all four - define the purpose before comparing silhouettes.

The safest body faces are your old friends: Open Sans with its enormous apertures and low cognitive load, and Inter optimised for on-screen reading. For a warmer, more humanist feel, Lora's calligraphic serif brings paper texture to screens; for a sturdier edge, Bitter is the stalwart for news sites and books. Body text is not about 'pretty' - it is about not tiring the reader after a thousand words. Prefer neutral faces that stay out of the way.

UI faces must pass three tests: legibility at 12-14px, tabular figures for statistics and quotations, and a complete weight ladder for buttons and selected states. Inter and DM Sans are the honours students here, while Roboto's twelve-weight gradient powers the entire Material system. For developer-facing or data-dense products, put monospace first: Source Code Pro disambiguates 0/O and 1/l/I for code, and Fira Code ligates operators like -> and != so code reads like typeset prose.

Headlines are the most direct costume of brand character: Poppins gives geometric fairness, Raleway's hairlines exude lightness and whitespace, Oswald's condensed forms pack dense information into banners and price tags, Playfair Display carries editorial nostalgia, and Montserrat's uppercase geometry is a city-poster staple. Remember the division of labour: display fonts decide the first impression; body fonts decide whether they still like you after a thousand words.

First, align x-heights: the Latin lowercase x should sit visually level with Chinese body text; very tall x-height faces (Roboto around CJK) may need the Latin dropped 1-2pt. Second, trust the baseline: browsers align on the Latin baseline and system CJK handles the rest - do not hand-tune. Third, match temperament: industrial with Source Han Sans/PuHuiTi, humanist serif with Source Han Serif/Zhuque Fangsong, rounded with Nunito next to Resource Han Rounded, pixel with Fusion Pixel beside Zhuque. Choose Chinese and Latin as one type system, not two favourites.