Vapi

About Vapi

Vapi is a developer-focused platform that provides an API for building, testing, and deploying voice agents capable of conducting real phone calls. The service handles the core infrastructure required for conversational voice AI, including speech-to-text, text-to-speech, and low-latency audio processing, allowing developers to focus on agent logic rather than telephony plumbing. It supports inbound and outbound calling scenarios and integrates with a range of large language models and voice providers, giving teams flexibility in how they configure their agents. The primary use cases for Vapi include automated customer support lines, appointment scheduling, lead qualification, outbound sales calls, and any workflow where a business needs to interact with users over the phone without human agents. Developers can define prompts, set conversation flows, connect external tools and APIs through function calling, and configure fallback behaviors. The platform also includes testing utilities so teams can evaluate agent performance before deploying to production. Vapi exposes webhooks and a dashboard for monitoring call logs, transcripts, and analytics, making it practical to iterate on agent behavior based on real call data. Vapi is aimed squarely at software developers and technical teams building voice-enabled products or automating phone-based business processes. It is not a no-code tool; working with it requires familiarity with APIs and prompt engineering. The platform operates on a usage-based pricing model, charging per minute of call time, which makes costs directly tied to call volume rather than a flat subscription. This structure suits startups and enterprises alike, since teams can start small and scale without committing to a fixed tier. Overall, Vapi positions itself as the infrastructure layer for voice AI applications, abstracting away the complexity of real-time audio and telephony so that engineering teams can ship voice agents quickly.

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