Text Content Analysis - UsingEnglish.com
Writing for the Web is much different than writing standard copy. On the Web it's important to grab a user's attention quickly and get your messsage across clearly and effectively. UsingEnglish.com is an interesting tool that could prove very useful for Web copywriters, PR professionals or just about anyone who wants to see their copy from a different point of view.
The tool will analyze your content for word count, frequency, unique words, number of sentences and average words per sentence. If you are guilty of writing run-on sentences or repeating the same word over and over and over - this could be a great tool to help you write clearly. Either way, a few tests of your copy and you'll start to see patterns that may need correcting.
Another interesting tool is the Fog Index. This examines your copy at a readability level. According to UsingEnglish.com, The New York Times has an average Fog Index of 11-12 (suggesting years of education needed to understand the text). There is also a measure of Lexical Density - a comparison of content words to regular words. Advanced features include a grammar analysis tool and further breakdown of the text.
Below is a portion of the breakdown of this post by UsingEnglish.com excluding this sentence.