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Introduction

Build voice AI agents that can make and receive phone calls

What is Vapi?

Vapi is the developer platform for building voice AI agents. We handle the complex infrastructure so you can focus on creating great voice experiences.

Voice agents allow you to:

  • Have natural conversations with users
  • Make and receive phone calls
  • Integrate with your existing systems and APIs
  • Handle complex workflows like appointment scheduling, customer support, and more

How voice agents work

Every Vapi assistant combines three core technologies:

Speech-to-Text

Converts user speech into text that your agent can understand

Large Language Model

Processes the conversation and generates intelligent responses

Text-to-Speech

Converts your agent’s responses back into natural speech

You have full control over each component, with dozens of providers and models to choose from; OpenAI, Anthropic, Google, Deepgram, ElevenLabs, and many, many more.

Two ways to build voice agents

Vapi offers two main primitives for building voice agents, each designed for different use cases:

Assistants

Best for: Quick kickstart for simple conversations


Assistants use a single system prompt to control behavior. Perfect for:

  • Customer support chatbots
  • Simple question-answering agents
  • Getting started quickly with minimal setup
Workflows

Best for: Complex logic and multi-step processes


Workflows use visual decision trees and conditional logic. Perfect for:

  • Appointment scheduling with availability checks
  • Lead qualification with branching questions
  • Complex customer service flows with escalation

Key capabilities

  • Real-time conversations: Sub-600ms response times with natural turn-taking
  • Phone integration: Make and receive calls on any phone number
  • Web integration: Embed voice calls directly in your applications
  • Tool integration: Connect to your APIs, databases, and existing systems
  • Custom workflows: Build complex multi-step processes with decision trees

Choose your path

Phone Calls
  • Create a voice agent for inbound/outbound calls
  • Build customer support or sales automation
  • Get started with no coding required

Build your first voice agent in 5 minutes using our dashboard.

Web Integration
  • Add voice capabilities to your web application
  • Integrate voice chat into your existing product
  • Build with code and SDKs

Embed live voice conversations directly in your app.

Customer Support
Built with Assistants

Automate inbound support calls with agents that can access your knowledge base and escalate to humans when needed.

Sales & Lead Qualification
Built with Workflows

Make outbound sales calls, qualify leads, and schedule appointments with sophisticated branching logic.

Appointment Scheduling
Built with Workflows

Handle booking requests, check availability, and confirm appointments with conditional routing.

Medical Triage & Scheduling
Built with Workflows

Emergency routing and appointment scheduling for healthcare.

E-commerce Order Management
Built with Workflows

Order tracking, returns, and customer support workflows.

See more examples

See our collection of examples covering a wide range of use cases.