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Talking NPCs with memory, vision and actions for game engines
Convai supplies the conversation layer for 3D characters, handling speech, lipsync, long-term memory and scripted action sequences so an NPC can answer questions and then do something about it. Characters draw on an uploaded document knowledge base and can take camera or in-world visual input, with support for 65+ languages and 500+ voices. It ships as plugins for Unity, Unreal, PlayCanvas and three.js plus APIs for custom runtimes, and is sold to enterprise training and brand-avatar teams as well as game studios.
Free developer tier plus paid plans metered by monthly character interactions; the pricing page is client-rendered and did not expose figures on inspection.
Use tool ↗The most engine-native option for conversational NPCs — if you are shipping in Unity or Unreal, this and Inworld are the shortlist. The interaction-metered pricing is what decides whether it survives contact with a real player base.
Watch out: Interaction-metered billing means runaway costs are a player-behaviour risk, not a design decision — budget against worst-case engagement, not average.
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