# Build custom voice agents **that scale**

### Built for developers

API-native and compatible with any stack for total control.

### Configurable by design

1000+ points of config, bring your own models, or choose from 200+.

[Start Building](https://dashboard.vapi.ai/register) [Request Demo](/content/sales/index.html)

Talk to Vapi give it a Try

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Teams at trail-blazing startups to Fortune 500 companies deploy voice agents on the Vapi platform.

The most configurable API to build leading voice AI products and scale phone operations.

Calls

300M+

Assistants Launched

2.5M+

Developers

500K+

Use cases

## Feels human. Moves the needle.

Inbound calls

Outbound calls

### Inbound calls

powers 400,000+ daily calls.

saves 100s

of engineering hours monthly.

[Try it Now](https://dashboard.vapi.ai/register) [Talk to Us](/content/sales/index.html)

#### A key technical requirement was the ability to bring our own stack — Vapi's developer-friendly API-first approach made this possible.

Quang Tran

CTO, FleetWorks

Receive call

Shipper Info

Use tool

Fetch_available_jobs_from_broker

Condition

Job Available?

Features

## Flexible for engineers. Easy for business users.

### Multilingual

Talk to agents in English, Spanish, Mandarin, or one of 100+ other supported languages.

### API-native

Everything is exposed as an API, with 1000s of configurations and integrations.

### Automated testing

Design test suites of simulated voice agents to identify hallucination risks before going to production.

### Bring your own models

Bring your own API keys for transcription, LLM, or text-to-speech models. Or, plug in your own self-hosted models.

### Tool calling

Plug in your APIs as tools to intelligently fetch data and perform actions on your server.

### A/B experiments

Test different variations of prompts, voices, and flows to continuously optimize performance.

ENTERPRISE

## Reliable.

## Scalable.

## Secure.

[Request a Demo](/content/sales/index.html)

## 99.9% Uptime

Custom real-time audio infrastructure with enterprise-grade reliability.

## Forward-deployed Team

Deployment assistance with a dedicated forward-deployed engineer to go live in a week.

## Sub-500ms Latency

Scale up and down to millions of calls in minutes with ultra-low latency interactions.

## AI Guardrails

Built-in conversation guardrails prevent model hallucinations and ensure data integrity.

## SOC2, HIPAA, & PCI Compliant

Enterprise-level security for healthcare and financial services.

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## Ship your first Voice Agent with Vapi

[Sign up](https://dashboard.vapi.ai/register) [Talk to an Expert](/content/sales/index.html)