NyxAI is a Traditional Chinese AI story-generation and interactive writing platform operated by Aerial Frontier in Hong Kong. Designed for readers and writers who want to turn an idea into a story, it can create fiction from a single opening line or a selected scenario, then help users continue, revise, and shape the plot. Its eight settings include campus, workplace, urban life, fantasy, maid, married-woman, superpower, and master-servant themes.

For longer projects, NyxAI offers chapter-by-chapter writing, automatic summaries, and tools to track characters and story clues. Users can create reusable character profiles, explore alternative plot directions, adjust story intensity, and ask the AI to bring a story to a conclusion. Completed works and character details can be exported as Word documents, while a community area supports publishing, browsing, ranking, and sharing stories.

New visitors can try the service without signing in, and registered users receive a daily free word allowance. Optional word packages are purchased as one-time payments, with no subscription or automatic renewal.