AIStoryHub (https://aistoryhub.co/) generates fictional chapters from an instruction.

Step-by-step guide: genre, tone, rhythm, point of view, characters, banned words.
A “Style Lab” refines the voice by cursors (rhythm, complexity of sentences, density of metaphors). Allows you to write conditional narrative rules that apply according to the characters present in the scene.
The generated texts can be modified via a word processing interface.

Pre-built fan-fiction universes (Harry Potter, Game of Thrones, Dune, Star Wars) with already integrated characters and locations and authors’ styles can be chosen.

Export text to EPUB, PDF, DOCX, TXT or complete ZIP archive.

Write via the built-in model in free version (DeepSeek V4 Pro, funded by the platform). A personal key (Anthropic, OpenAI, Google Gemini, OpenRouter) can be added to access other models.

Note: specify “Generate in French”.

Free and seems unlimited with the built-in template.