Question: Is there an AI-powered platform that can assist with writing a book from start to finish?

If you're looking for an AI-powered platform to help you write a book from start to finish, Novelcrafter is a great one-stop shop. It's got a full writing environment with AI-powered tools, a personal Wiki for keeping track of story details, and multiple writing modes (Plan, Write, Tinker, Review). It's flexible, accommodating both planners and pantsers with tools like outlining, revision history and customizable tags and labels.

Another interesting option is BookAIWriter, which can create a book from scratch, including plot outlines and finished book covers. It can help authors flesh out their story by determining plot, character development, writing style and chapter length, then can generate full chapters based on that. It can also generate AI-created cover art and offers customizable writing styles, so it's good for writers who want to rapidly flesh out their ideas into a finished book.

For a more complete writing experience, NovelAI is a subscription-based service that uses AI for authorship and storytelling. It's got a natural language processing AI that can write in your style, tools for visualizing characters and world-building, and a customizable editor. The service also includes modules for writing in specific styles and a lorebook for keeping track of world-building details, so it's good for fiction and interactive fiction writers.

Finally, check out Sudowrite, an AI-powered writing assistant designed to help fiction authors overcome writer's block. It uses large language models to help with idea generation, outlining, writing, editing and refinement. With tools like Describe, Story Bible, Write, Expand, Rewrite and Feedback, Sudowrite is designed to help you be more creative, productive and fun while writing. It offers a free trial and several pricing tiers to match your needs.