Cal Sans UI free font is a variable typeface by Mark Davis for Cal.com with a GEOM axis that slides between humanist and geometric forms, released under the SIL Open Font License for free personal and commercial use.

Cal.com, the open-source scheduling platform with more than 50,000 GitHub stars, commissioned the type family from WORDMARK, Davis's typographic practice. The result is not a generic UI face. Cal Sans UI ships as three distinct families: Cal Sans UI, Cal Sans UI Text, and Cal Sans UI Geo, each with a weight axis spanning Light to Bold and a custom GEOM axis running from 0 to 100. At GEOM 0, letterforms carry organic, humanist curves. At 100, those same letters resolve into strict geometric proportions. The font slides between both states continuously, giving designers a tool with genuine expressive range.

The family was built for interfaces, optimized for 14–15px rendering on high-density screens. Vertical metrics align with Inter, Geist, Roboto, and other system UI standards, so dropping Cal Sans UI free font into an existing codebase requires no layout adjustments. Five weights are supported across all three families, and the typeface handles more than 100 languages.

Download the Cal Sans UI Free Font

The Cal Sans UI free font is available on GitHub at the calcom/sans-ui repository and via npm as @calcom/cal-sans-ui. The interactive specimen microsite at cal.com/font lets designers explore the GEOM and weight axes live before downloading. Creative Boom named it one of the best new typefaces of April 2026. Google Fonts and Adobe Fonts submissions are pending.