Hemingway makes your writing bold and clear
You know what's fun?  Pasting in text from Ernest Hemingway and seeing what he did wrong.<p>But seriously, this is a nice, simple way to point out some general rules of thumb for improving writing, although I would love for it to be less proscriptive.  Not every long sentence is a bad sentence, not every passive-voice sentence is a bad sentence, and not every adverb is a bad adverb.<p>Oh, and by the way, the copy editor in me can't help but notice that an app that's intended to help you improve your writing tells you to "Aim for 2 or less" adverbs, rather than "Aim for 2 or fewer."