99% Invisible is a radio show and podcast produced and created by Roman Mars that focuses on design. It began as a collaborative project between San Francisco public radio station KALW and the American Institute of Architects in San Francisco. PRX has distributed the show for broadcasting on a number of radio stations and as a podcast on the Radiotopia network. On April 28, 2021, Roman Mars announced in an introduction of a re-released episode that 99% Invisible had been purchased by SiriusXM and marketed as part of its Stitcher Radio brand.