Hemingway is a free tool designed to help you analyze your writing. To use Hemingway, found at Hemingwayapp.com, just paste some text into the Hemingway editor and it will provide you with a bunch of information about that text. Hemingway highlights the parts of your writing that use passive voice, adverbs, and overly complex sentences. All of those factors are accounted for in generating a general readability score for your passage. The short video embedded below shows how easy it is to use Hemingwayapp.com to analyze your writing.
Applications for Education
Hemingway is the kind of tool that I like to have students use before exchanging papers with classmates for peer editing. Hemingway acts as a kind of "virtual peer" before the peer editing process. I would also have students use Hemingway before turning in their final drafts for a grade.