What is Ultravox.ai?

Ultravox is a real-time voice AI infrastructure layer that powers fast, natural, and scalable voice agents. It trains its own speech-native models and runs them on dedicated, purpose-built infrastructure to minimize latency and preserve paralinguistic cues. The platform provides developer-friendly APIs, SDKs, and built-in tools for building conversational voice AI experiences.

How to use Ultravox.ai?

To use Ultravox, sign up for a free account and start with the Pay As You Go plan, which includes 30 minutes of free calls. Integrate the REST APIs or SDKs into your application to add voice capabilities. Use the built-in tools for telephony integration, custom voices, and RAG corpora to build and scale your voice agents.

Core features of Ultravox.ai

Speech-native model (Ultravox v0.7) with state-of-the-art Big Bench Audio scores
Real-time, low-latency inference stack
Developer-friendly REST APIs and SDKs for web and mobile
Built-in telephony integrations
Neural VAD (UltraVAD) for turn-taking and endpointing
Open-weight models and research sharing
Scalable pricing with free tier and Pro plan