A company that specializes in Web monitoring, Rigor is capable of running a series of analyses that go well beyond the ones provided elsewhere. Rigor can keep a close watch on the way in which people interact with your content, the number of checks that are performed and (if you have one) how often people are accessing your API. Of course, something as basic (and pivotal) as monitoring uptime and downtime is also part of the provided services, and the relevant reports will be duly served for you to see if your hosting lives up to the hype or not.
Four plans are already available: Group, Professional, Enterprise and Ultimate. You should really take a look at the chart that is provided on the site in order to learn about the endless differences at play, but I can tell you that each plan has its own URL test frequency, and its own maximum number of pings and checks. And if you still have any doubts, just give the free demo a spin. That should do the trick.
Rigor.com In Their Own Words
Rigor provides functional testing and monitoring for web applications by emulating users. Move beyond ping monitoring and understand the health of your critical user interactions – without intrusive agents, installed software, or complicated scripting.
Why Rigor.com It Might Be A Killer
It is an almost faultless way to have your site checked from front to back.
Some Questions About Rigor.com
Where is this company based? 
