Most single serving websites are very gimmicky, like telling you you’re awesome, showing you how to spell “definitely”, or playing a fail sound. Some, however, are actually useful.

If you’re unfamiliar with the term, a single serving site is a one-page website with its own domain name that focuses on doing just ONE thing. These sites are by their very nature limited in scope, and that’s the whole point. They need to be dead simple to use, and most of the time they are just designed to answer a very specific question or perform a simple task.

Here are some of the more useful single serving websites we here at Pingdom have stumbled upon in our wanderings around the Web.

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