Convai

Convai is a turnkey platform for building conversational AI characters and NPCs with dialogue, voice, memory, actions, and lip-sync, plus plugins for Unity and Unreal. It stayed focused on drop-in NPC tooling as competitors moved toward infrastructure, making it a popular choice for game developers. It uses usage-based billing on top of subscription tiers, so live dialogue costs scale with player activity.

Convai provides tools to build interactive, conversational characters and NPCs that can talk with players in natural language, remember context, take in-world actions, and respond with voice and lip-sync. It offers plugins and SDKs for game engines like Unity and Unreal, making it relatively straightforward to embed AI-driven characters into games, simulations, and virtual worlds. Convai stayed focused on being a plug-in NPC platform even as competitor Inworld shifted toward broader AI infrastructure in 2025, and as a result it has become a go-to choice for many game developers who want turnkey conversational NPCs. Its feature set spans dialogue generation, voice synthesis, character memory, and engine integration. Convai uses usage-based billing layered on top of subscription tiers, meaning generated dialogue costs money each time it is produced, per character and per interaction. This is a fundamental economic shift from traditional hand-authored dialogue that is paid for once, so developers must budget for ongoing costs that scale with player activity, potentially reaching thousands per month for high-traffic titles.