Curious about the design behind jupyter.org? SiteFontCheck scanned their live CSS architecture and identified 2 unique font families. The website relies heavily on <helvetica neue, helvetica, arial, sans-serif> for its main text elements, paired with <myriad pro, helvetica neue, helvetica, arial, sans-serif> as fallback options. Below is the precise map of font sizes, weights, and text elements used across their site.