Well, if you wish to check whether a website has change or not, you can signup and submit a URL that you want to monitor to a website known as ChangeDetection.com.

This monitoring website will create a change log for the any pages change and notification services to internet users worldwide and alert users via email when once it has detected a change either in the text of a webpage or what’s being posted on webmaster’s own site by visitors or contributors.

The service has been there since year 1999 and it’s free.