No, you're not crazy — Twitter has a new font Back in January, Twitter revealed that it had made a new branded font family for its products, called Chirp. (Get it — Twitter, Chirp?) After laying low for the last few months, based on user reports, that new Chirp font has started rolling out to the web version of Twitter starting today. Twitter using Segoe UI on Windows (left) and Chirp on macOS (right). The distinction between the old and new font sets vary. When it comes to some of the bold headers, it's a little harder to spot the tweaks to letter shapes (and a difference in platform between these two screenshots could also affect some aspects of what you see), but the new font is visibly distinct and noticeable — hence all of today's reports regarding the change. Twitter says it's based on a blend of American Gothic and European Grotesque styles, striking a "balance between messy and sharp" that is both serious and fun. I don't know whether I subscribe to all that descriptive hype, but it is a nice set of fonts.