Are you talking about a way of checking individual sites or crawling the net looking for them? To check any particular site there is Google's own https://www.google.com/webmasters/tools/mobile-friendly/Hey ! Is there any method (website, app), that can spot websites without mobile design around internet?
Thanks!
Sartanion
I would like to ask the same question, is there any query or app/bot/script that can crawl the web and say bring back results, eg "architects" that have websites that are NOT mobile friendly or don't have a mobile website.
Tx in advance.