SpeakUnique

Pingdom provides reliable peace-of-mind monitoring for websites, along with usable load time info for key pages over time.

It confirms that everything's still working, even when I'm not :-)

For a basic website, the free version of Pingdom provides enough checks to have a few URLs watching the live site, with enough additional left over to check on admin systems, dev/test environments etc..

Websites that need more monitoring than what is provided in the free version are easily worth the minimum expense of a paid package, with far more checks, sophistication, and functionality.

Written without prejudice: I'm not connected with Pingdom in any way. I've used them for a decade+ for website monitoring and it's been a good service.