Soapbox and Qualtrics Panel, two similar services offering existing panels of survey respondents, produced very different yields, with the Soapbox producing more eligible surveys by a factor of 6 (Soapbox, n=72; Qualtrics Panel, n=12). The 2 platforms produced similar quality yields: 67% of Soapbox surveys and 86% of Qualtrics Panel passed the quality screens. Both companies described the challenge of recruiting pregnant smokers to complete our surveys upfront. Although Qualtrics produced a low eligible yield (26%), it produced the second-highest quality percentage of 86%. In contrast, Soapbox recruited a higher number of respondents than Qualtrics Panel could, but only 67% of Soapbox surveys were able to pass the quality screens. Going forward, we would be more likely to use Soapbox than Qualtrics Panel, given the higher yield.