Twitter’s proprietary typeface introduced in 2021 was called Chirp.
Twitter announced Chirp as part of a broader visual redesign in August 2021. The typeface was intended to give the service a more distinctive voice across its website, mobile applications, marketing, and interface elements. Its design combined familiar letterforms with details meant to feel expressive and readable at different sizes.
The redesign also changed colors, buttons, contrast, and other interface details. Chirp is sometimes confused with a generic “Twitter font,” but it was specifically the company’s branded typeface rather than a nickname for all typography used on the platform. The launch took place before Twitter became X in 2023.
The rebrand changed the service’s name, logo, and visual identity, so references to Chirp usually describe Twitter’s pre-X design system. It remains an important milestone in the platform’s brand history.