Pingdom is a widely used service that monitors uptime and notifies you whenever a site goes down, as well as gives you the data you need to whine at your webhost’s 99.99% uptime guarantees whenever they fail to meet their promise. Up until now, it has been a paid service, but now you can get an account for free.
Pingdom Free has all the features of our paid account types. The only limitation is that you can only monitor one website or server, but that should be enough for a lot of bloggers and hobbyist webmasters out there.
You also get 20 SMS alerts for free as well, which is nice. Naturally, you can upgrade your account to monitor more sites and get more SMS alerts (email is free) and so on whenever you like. Which of course is the whole idea.
Give it a go, free is the best price ever and I can, as a user, honestly say that Pingdom is great. Particularly when you don’t hear from them…!