Just open it in any browser, paste writing directly into the white space, and let Hemingway do its magic. As the screenshot above indicates, sentences that need different types of editing (think: simplifying the structure or eliminating passive voice) will be color-coded accordingly.
Hemingway doesn't stop there — it also features a readability meter that tells you how difficult it is to comprehend your writing. If you're aiming to deliver a succinct message, anything above "Grade Level 10" is, according to Hemingway, way too complicated. (source Mashable)