According to the website, it is currently in beta for a limited time. You can use all the features in the product for the time being. After the beta period, they will decide if some free functions will possibly be restricted in its use. So do be prepared for the site to change in the future. Keep an eye on the site for more information.
Read more http://www.whiteboardblog.co.uk/2012/12/make-word-clouds-with-typoeffects/
"Tagxedo turns words -- famous speeches, news articles, slogans and themes, even your love letters -- into a visually stunning tag cloud, words individually sized appropriately to highlight the frequencies of occurrence within the body of text."
