Charisma.ai

A full-stack voice runtime for building human-sounding AI agents.

A developer platform for real-time voice AI — an integrated STT + LLM + TTS pipeline exposed through REST and WebSocket APIs (OpenAI Realtime-compatible) for companions, character chat, support, and phone agents. Beyond the voice stack it offers a model Router, inference, and compute, with cloud and enterprise on-prem deployment.

Conversational AI characters and NPCs for games and virtual worlds.

Convai is a developer platform for building lifelike, voice-driven non-player characters and virtual humans. Its SDKs for Unity, Unreal Engine, PlayCanvas, and the web add end-to-end speech, LLM reasoning, long-term memory, perception, and action execution so characters can hold natural conversations, understand their surroundings, and perform in-world tasks. Studios use it to ship interactive NPCs across games, XR, and the open web.

AI roleplay games set in your favorite story worlds.

Hidden Door is a social AI storytelling platform where players roleplay collaborative adventures guided by an AI Narrator, presented as interactive graphic novels. It launched with public-domain worlds like Pride and Prejudice, The Call of Cthulhu, and The Wizard of Oz, and licenses IP through revenue-share with creators rather than training on their work without permission. Every playthrough differs because choices reshape the story.

AI-native game engine and platform for building games with generative AI.

Series AI is a generative-AI game development company building Rho Engine, an AI-native, full-stack platform that uses generative models to speed up game creation — from concept and assets through to playable builds. Founded by veteran game developer Pany Haritatos, it works with studios and IP holders to co-develop AI-native games.