"Hemingway is a markdown editor that coaches you to write more clearly, helping you to emulate Ernest Hemingway's trademark sparse, journalistic style. Though I don't use it as my main markdown editor, I've been thinking about ways it can be useful in a variety of learning tasks."
"Hemingway highlights long, complex sentences and common errors; if you see a yellow highlight, shorten the sentence or split it. If you see a red highlight, your sentence is so dense and complicated that your readers will get lost trying to follow its meandering, splitting logic - try editing this sentence to remove the red."