Question: Is there a writing assistant that can help me develop my story outline and write chapters in my style?

If you're looking for a writing assistant to help you flesh out your story outline and write chapters in your voice, Sudowrite is a top contender. This AI-powered tool is geared for fiction writers and includes tools for generating ideas, outlining, writing, editing and refining your work. It's based on large language models like GPT-3 and GPT-4 that can generate text based on prompts, so you can use it to create story outlines and then tweak your writing style. Sudowrite also has tools for brainstorming, visualization and project organization, all wrapped up in a clean interface.

Another top contender is Novelcrafter, an all-purpose novel writing tool that can help you from the earliest stages of your project to the final draft. It's got a personal Wiki (Codex) for storing story information, multiple writing modes and AI tools for outlining and editing. Novelcrafter also has customizable tags and labels so it can work for planners and pantsers. The service can integrate with other AI services and has several pricing levels, including a 14-day free trial, so you can use it for whatever level of writing you need.

If you prefer a subscription-based service, NovelAI has a broad range of tools to help you write in your own style. It's got tools for character visualization, interactive fiction, custom editing and world-building. With tools like AI modules for writing in a particular style and a lorebook for world-building details, NovelAI can be very useful for authors who want to create rich, immersive stories.

Last, LivingWriter offers a more structured approach with its AI Outline Generator and a clean interface for organizing manuscripts. It's got tools like smart text, auto-suggest, writing goals and export support, all available on multiple devices. With its focus on organizing and structuring manuscripts, LivingWriter can help you stay on track and keep your writing flowing.