When a website is down it will send an email stating it is down and after every 5 minutes it will monitor the website and send the status of uptime

It has been reliable for us for over 8 years. When we needed to add domains to our plan for monitoring their customer service was extremely helpful. The features are good and reasonably priced.

I like that all we have to do is configure things one time in the AlertBot dashboard and then pretty much move on and forget about it. We have 9 websites where uptime is absolutely crucial, and AlertBot always works with zero problems.