Cosmonaut AI Reviews — Discover what people think of this product.

Cosmonaut is a prose-first interactive fiction platform for families and readers. You start with a prompt - a setting, a character, a mood, or a book or movie you love - and Cosmonaut writes a richly written chapter, then hands control back to you. Choices branch the narrative, and the story remembers them: a decision made on page three is still true on page seven.

What makes it different

• Real prose, not chat. Each branch is a fully written chapter in a consistent voice, paced toward a decision point.
• It knows your reader. Vocabulary level and content filters are settings on every tier - a six-year-old gets one register, a nine-year-old gets another. The hook is the same; the cloth is different.
• Custom actions. If none of the choices fit, write your own. The story continues in the same voice.
• A visible story map. See the branches you've taken and the ones still waiting.
• No dark patterns. No autoplay, no feed, no notifications, no points, no grind. The story waits.

Built for shared use. Closer to a board game night than putting on a show. Works just as well solo - adults use it for their own genres at their own pace.

Tiers. Scout (free), Explorer (more stories per month), Cosmonaut (adds warm, natural audio narration).