Notebook.ai

Notebook.ai is a worldbuilding notebook designed for writers and roleplayers. It helps users create and organize fictional universes, characters, locations, items, and more. The free tier supports up to 5 universes with unlimited characters, locations, and items, plus 50MB image storage. Premium ($9/month) unlocks 25 additional page templates (creatures, floras, planets, etc.), unlimited universes, and 10GB image upload. Features include guided writing prompts, continuity checks, search, a built-in document editor with AI readability and style analysis, and the ability to share pages with collaborators. The platform is ad-free and automatically backs up data.