Ranked in these QuestionsQuestion Ranking
Pro Can monitor source code changes
Pro Check frequency up to 3 times a day
Pro Notifies via email
Pro Allows easily noting when changes took place with a calendar view
Pro Has a two-week trial
Pro Keeps revision history of pages for a year
HTML source code and web shots are kept for a year.
Con No filtering options
Con Can't monitor pages that require login credentials
While it's not currently possible to track changes made to pages behind a login, it is promised that the capability will be added in the future.