If you're looking for a Poly.AI alternative, NovelAI is another good option. It offers a subscription-based service for authorship, storytelling and virtual companions. NovelAI uses large language models to generate literature without any censorship or rules, so you can write in your own style. With tools like visual character generation, interactive fiction modules and customizable editing tools, it's a full-fledged writing and storytelling environment.
Another good option is Backyard AI, which is geared more toward immersive text adventures and interactive storytelling. It's got both offline and online modes, and promises full privacy and no setup. With a desktop app that runs AI models locally, you keep control and keep your data private. It supports a variety of hardware and languages, and has a free tier with prices starting at $7 per month.
If you want to collaborate on storytelling, StoryNest.ai has a more developed platform with tools for character creation, world-building and AI-assisted editing. It can handle a variety of formats, including interactive fiction, novels and scripts, and has tools for collaborative editing and voice narration. You can sign up for free to try its features, and pay for more advanced tools with its paid plans.
Last, Charisma is a plug-and-play platform for creating interactive stories with lifelike virtual characters. It has speech-to-text access, custom voice integration and generative AI dialogue. It's good for learning, entertainment and marketing, and has options for individuals and businesses, so it's good for a variety of creative projects.