measure similarities between responses - SpAM method

Hello dear community, 
I read in an article (https://www.tandfonline.com/doi/full/10.1080/00273171.2020.1857216) that it was possible to have a survey to measure similarities between responses. "As software to collect similarity data online through SpAM has recently become available in the form of JavaScript code implemented in the browser-based survey software Qualtrics (Koch et al., 2020), it is to be expected that the use of the method will only increase." I can't seem to find this model on the site. Can you help me? Do you know of anything similar? 
Sincerely, Cendrine MERCIER