Convai

Best for NPCs that talk back with voice, memory and perception

Can you ship it?

Yes, with conditions You own characters and AI output on any plan; public apps must show Powered by Convai Source

Price

Free developer tier, usage-based paid plans

Works with

Unreal, Unity, web

A hosted character platform with an Unreal plugin, so you attach conversation to existing NPCs instead of building an LLM pipeline. Every generated line costs money per player, and Steam requires you to describe your guardrails for live AI content.