Expresso is a little tool to edit texts and improve your writing style. It will teach you to express yourself through writing more efficiently and help make your texts more readable, precise, and engaging.
I often complain that authors don´t pay enough attention to spelling and grammar and publish books without proper editing. Although I understand that editing can be expensive and not all authors can afford it, it does not change the fact that a book needs proofreading and some editing before publishing. For those that can´t afford a professional editor this might be a useful tool worth trying.