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Which AI tool should I use to add AI NPC dialogue to my game?

Conversational NPCs combine an LLM, memory and voice with engine plugins. Watch per-interaction costs once players arrive.

Rank 1

Convai

Verdict Purpose-built for talking NPCs with Unity/Unreal plugins, voice and in-world actions. Per-interaction pricing gets expensive at scale, and the free tier is very limited.

Best for
Prototyping talking NPCs in Unity or Unreal

Price
Free tier: yes. $29/mo. Indie Dev $29/mo ($22 annually), 3,000 interactions. UNVERIFIED: free plan (100 interactions) seen only in third-party sources; official pricing page did not render.

Last checked
17 Oct 2026

Link
Open tool
Rank 2

Inworld AI

Verdict Strong real-time voice (TTS/STT) and LLM infrastructure with a free on-demand tier. It has moved from an NPC engine to a general voice platform, so expect to do more integration work yourself.

Best for
Teams building their own NPC stack who need fast, cheap voice

Price
Free tier: yes. $25/mo. Free On-Demand tier includes limited TTS/STT minutes, then pay-as-you-go. Product is now a general voice/AI runtime rather than a dedicated NPC engine.

Last checked
17 Oct 2026

Link
Open tool

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