What font does UrbanFootprint use for map titles and legends?

PNG map exports use the Roboto font for titles and legends. If you'd like to use a different font, consider exporting your map to PNG format without a title, and with a legend as a separate file. Then, you can layer on a title and legend labels using a graphics editing program. You can do the same with maps exported to SVG format.

The Roboto font is available for free. You can download it here: https://fonts.google.com/specimen/Roboto.