API

Documented cloud or local API for TTS, STT, LLM, or character sessions.

4 of 4 tools marked Yes.

Tool	Status	Notes	Source
Inworld	Yes	TTS, STT, Speech-to-Speech, LLM Inference APIs	Source
Convai	Yes	Character APIs, vision APIs, crafting API on higher tiers	Source
Charisma	Yes	SDKs for web, mobile, VR, Python/React plus engine Plug-n-Play	Source
NVIDIA ACE	Yes	Microservice APIs for ASR, TTS, animation, LLM	Source