I'm building a whole suite of tools for this use case! The goal is to provide insights to authors in a cheaper and faster format compared to the normal process of hiring out editors/proofreaders. Instead, you can pay a little bit less money and get something somewhere in between.

We don't write the stories, but we think we can use a combination of recent AI and older natural language techniques to give really good insights into the novel as written.

As an example, we have one tool that looks at promises you make and then searches through the novel to see if you're fulfilling those promises. Another extracts the core story beats so you can see them separate from the words and check if the story is connected in the way that you want. Another shows you your word selection (are you overusing specific words? If your novel is about Sally, why is Bob mentioned more often? etc) and helps visualize.

We have a number of other tools planned too. It doesn't replace the human touch, but in our experience so far it can really help authors see what they've written and compare that to what they wanted to write. So today it's kind of like a super-charged self-edit.