What is Vapi used for?

Vapi is used to build voice-based AI assistants that can handle customer support, sales calls, appointment scheduling, and other conversational tasks over the phone or web.

How does Vapi handle latency?

Vapi uses a specialized orchestration layer that optimizes the data flow between speech recognition, the LLM, and speech synthesis to keep response times under 500ms.

Can I use my own LLM or TTS provider?

Yes, Vapi allows you to bring your own API keys for providers like OpenAI, Anthropic, ElevenLabs, and Deepgram, or use their built-in defaults.

Does Vapi support phone numbers?

Yes, Vapi provides built-in telephony capabilities allowing you to buy numbers or bring your own via SIP trunking to make and receive calls.

Is Vapi developer-friendly?

Vapi is built for developers, offering a robust API, SDKs for web and mobile, and a dashboard for testing agents in a sandbox environment.

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Voice agents

Freemium

Vapi

Vapi is a voice AI orchestration platform that enables developers to build and deploy low-latency, conversational voice agents for phone and web applications in minutes.

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Rating

Reviews

Upvotes

3 months ago

Listed

Voice AI

Conversational AI

Customer Support

Voice Automation

Speech-to-Text

Text-to-Speech

LLM Orchestration

Outbound Calling

Inbound Calling

Developer Tools

Tool information

Provider

Vapi AI

Platforms

Web

API

iOS

Android

Languages

English

Spanish

French

German

Hindi

Portuguese

Chinese

Japanese

API Available

Yes

Added to directory

3 months ago

Last updated

about 2 months ago

Rating

Not available

Pricing

Freemium

About Vapi

What the tool does and who it's for

Vapi is a comprehensive Voice AI platform designed for developers to build, deploy, and scale real-time voice agents in minutes. It abstracts the complexities of orchestrating speech-to-text (STT), large language models (LLMs), and text-to-speech (TTS) engines. By managing the underlying pipeline—including noise cancellation, echo reduction, and latency optimization—Vapi allows businesses to create conversational AI for inbound and outbound calls that feel natural and responsive. It supports deep integration with custom backends and provides a robust API for programmatic control over call flows.

Key capabilities

Real-time low-latency voice orchestration (under 500ms)

Seamless integration with top LLMs like GPT-4, Claude, and Groq

Support for premium TTS providers including ElevenLabs and Play.ht

Advanced STT engines such as Deepgram for high accuracy

Programmable function calling for live data retrieval during calls

Built-in handling for interruptions and background noise

Customizable voice personalities and emotional tonality

Webhooks and API for deep integration with CRMs

Support for both web-based audio and PSTN/Phone calls

Call recording and detailed post-call analytics

Pricing

Freemium — plans below

Free Credits

$10 in complimentary credits
Full API access
Access to all voice and LLM providers
Web and Phone integration

Pay-as-you-go

Enterprise

Contact sales

Volume discounts
Dedicated infrastructure
SLA guarantees
Priority support and onboarding

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FAQ

Vapi FAQs

Common questions about Vapi