The Hemingway App can make your writing bold and clear. Well, that’s what the website promises.
All you need to do is to post a text onto the website. Sentences marked in yellow are difficult to read. Sentences marked in red are very difficult to read. Words or phrases marked in purple have simpler alternatives. Words marked in blue are adverbs that need to be removed. And passive-voice sentences are marked in green. You might like to change them to active-voice sentences.
This YouTube video can help you get started.