Vapi enables building, testing, and deploying voice AI agents. The platform orchestrates transcription, language models, and text-to-speech into low-latency conversations. Developers configure APIs for models from any provider, integrate telephony, websites, or apps, and scale to millions of calls. Everything exposes as an API with thousands of configurations. Agents support 100+ languages and use tools to fetch data or perform actions. Test suites simulate calls to check performance and reduce hallucination risks before production.
Handles complex backend infrastructure so developers focus on agent logic
Supports bring-your-own API keys for models and self-hosted options
CLI speeds up project setup across multiple frameworks
Workflow builder was in early beta as of mid-2025
Scaling to millions of calls demands enterprise plan for full reliability
