Take a look at updatepatrol dot com which has software that will alert you when pages change or look at changedetection dot com which alerts you when text is removed or added.
I need a basic rails app built (don't worry about design) that will allow users to login and add urls to their account and the system will run an automated task each day or each 4,8, or 12 hours if the page has changed.
It should notify them of the change via an email and also highlight the section that changed.
I should also be able to see the page differences once I log into the site to look at my list of urls.
MUST USE ESCROW
MUST HAVE A LOT OF FEEDBACK
MUST HAVE RAILS PROJECTS THAT I CAN LOOK AT
* i just need the proof of concept for now to get approval from client and then the project will have more work for you to to once we show that it works *