I'm looking for a service that will check a webpage/URL at regular intervals and look for a certain word/keywords on the page and notify me if the words have disappeared from the webpage/url. Ideally something that is free! I've found one variation, but it doesn't seem to work and support doesn't respond to the emails. I've found many website alive/website down checkers but they aren't based on text on the page, rather they check for HTTP error codes and ports. Anyone know of anything?