…Slightly more complex, but also data-rich and informative, is monitor.us.
Sign up, and you can monitor sites, compare site up-time, get detailed
reports, and receive email alerts when your site goes down. monitor.us
is not as easy to use at Montastic, but the reporting is more robust.
And since both services are free, it certainly doesn’t hurt to use both
to monitor your sites…

(Source: www.beaconfire.com/blog/2008/01/03/web-site-monitoring-tools/)

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