Vapi is a developer platform for building AI voice agents that can make and receive phone calls. It handles the complex infrastructure of speech-to-text, LLM reasoning, text-to-speech, and telephony so developers can focus on defining the agent's behavior and conversation flow. Developers building appointment schedulers, customer service bots, sales outreach agents, and IVR replacements use Vapi to deploy production-grade voice AI without managing telephony infrastructure. Latency is typically under 700ms, making conversations feel natural rather than robotic. Vapi's API-first design makes it easy to integrate with existing business systems: a CRM lookup during a call, a calendar booking after qualification, or a ticket creation after support resolution. It has become a primary infrastructure layer for the growing voice AI agent ecosystem.

What the community says

Developers on Reddit r/AI_Agents and Product Hunt praise Vapi's ease of getting a working voice agent deployed quickly. It's become a standard recommendation in AI agent communities. Some note costs can scale up with high call volumes. Based on community discussions from Reddit and Product Hunt.

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