Google's Mobile-Friendly tool seems to have an API, that you can use if you own/run the sites: http://searchengineland.com/google-mobile-friendly-testing-tool-n

Google's Mobile-Friendly tool seems to have an API, that you can use if you own/run the sites: http://searchengineland.com/google-mobile-friendly-testing-tool-now-api-access-268402 http://searchengineland.com/google-mobile-friendly-testing-t... Or have a look at BuiltWith: https://kb.builtwith.com/lead-prioritization/finding-non-mobile-optimized-websites/ https://kb.builtwith.com/lead-prioritization/finding-non-mob...