Siri Core is a 'cleaned up', manually hinted version of Siri, designed to perform better in small sizes on screen. Since pixels on screens still have lower resolution than your average ink on paper variety, we decided to optimise the letter spacing and trim some of the details in Siri to be able to present something that deserves to be called webfonts. It's currently available in a basic four-style family; regular, italic, bold and bold italic.

While waiting for the web to support OpenType-features, small caps and old style figures comes in separate fonts as expert subsets.