This tool help you monitoring website content online and send an alert email to you. There's four option for monitoring.
1, Contains Content: Send an email to you when the url contains target contents. This selection help you filter some keywords to site
2, Not Contains Content: Send an email to you when the url do not contains target contents. This selection help you monitor the back links for advertisers or link parnters.
3, Pagesize changed: Send an email to you when the target url page size is changed, this selection help you monitor unauthorizd modification to your site.
4, Counter Changed: Send an email to you when content counter is changed, the content counter is how many times the content appears on the url. This selection help you monitoring any new replies to your page.
And you can run  an cron job for auto website content monitoring, script for  crontab is cronjob.php, run your monitoring task on background and send alert mail.