Curious about the design behind graphviz.org? SiteFontCheck scanned their live CSS architecture and identified 1 unique font family. The website relies heavily on <open sans, -apple-system, blinkmacsystemfont, segoe ui, roboto, helvetica neue, arial, sans-serif, apple color emoji, segoe ui emoji, segoe ui symbol> across its main text elements. Below is the precise map of font sizes, weights, and text elements used across their site.