This tool is really just for fun unless your website is going to be getting millions of users every day you don’t need to worry too much about registering domains to catch the typo errors.

Of course you may want to catch visitors to sites that are already very popular by registering your own typo error domain, back in 2010 a study by Harvard University students estimated that as many as 68 million typos a day were made resulting in hits to websites owned by canny domainers.  The study suggested that search and web advertising giant Google were earning as much as $500 million a year from ads on these sites.

With new websites coming online all the time if you can predict the next big success story and register the typos you can make big money from advertising and if not you can just have a bit of harmless fun with your domains.