If you're having trouble getting your novel off the ground, Sudowrite is a good AI tool to get you started. This writing assistant is geared to help you break through writer's block with tools to generate ideas, create outlines, write, edit and refine. It can use large language models like GPT-3 and GPT-4, and has more practical options like customizable dark modes, full-screen focus mode and project management tools. You can try Sudowrite with a free trial, and it's available in three tiers to match your needs.
Another option is Novelcrafter, an all-in-one novel writing tool. It's got a personal Wiki (Codex) for storing and tracking story details, a variety of writing modes and AI tools to help you at every stage of the process. You can control AI context and prompt settings, so it's good for planners and pantsers. You can try Novelcrafter with a 14-day free trial, and it's available in a few tiers for different writing styles and needs.
If you like a more interactive approach, check out NovelAI. This subscription service uses AI for storytelling and virtual companionship, so you can write literature without any censorship or rules. NovelAI has a natural language processing AI, a customizable text adventure module and an editor you can customize to your style. It also has tools to visualize characters and to house world-building details in a lorebook.
And then there's StoryScape AI, which offers a different way to build an immersive storytelling experience. The app uses Chat GPT and DALL-E to build AI chapters and to customize the reading experience with font sizes and backgrounds you can adjust. You can build, customize and share your stories, and the company plans to add features like the ability to save favorite stories and suggest chapter changes. It's available on the web and on Google Play with a free trial.