Vapi AI Voice

freemium

Vapi is the leading voice AI platform for developers. Build, test, and deploy conversational voice agents with 100+ language support, bring-your-own-model flexibility, and enterprise-grade reliability.

Audio & Voice Tools

Automation & Agents

AI Models & Infrastructure

About

Vapi is a developer-first platform designed to make voice AI simple and accessible. Trusted by teams at Fortune 500 companies and fast-moving startups, it powers over 300 million calls and has helped launch more than 2.5 million assistants. With an API-native architecture, every feature and configuration is exposed programmatically, giving engineers full control over their voice agent stack. Building with Vapi starts fast: choose from thousands of pre-made templates or build from scratch, plug into your existing telephony, website, or app, and go live in days. The platform supports inbound and outbound call flows, multilingual conversations in 100+ languages including English, Spanish, and Mandarin, and real-time tool calling to fetch data or trigger actions on your server. Vapi is uniquely flexible—bring your own API keys for transcription, LLM, and text-to-speech providers, or connect self-hosted models. Automated testing suites let teams simulate voice agents to catch hallucinations before deployment, while A/B experimentation helps continuously optimize prompts, voices, and call flows. For enterprise customers, Vapi offers 99.99% uptime, sub-500ms latency, horizontal scaling to millions of simultaneous calls, AI guardrails for data integrity, and compliance with SOC2, HIPAA, and PCI standards. With a community of 250,000+ developers and 40+ app integrations, Vapi is the go-to infrastructure for production-grade voice AI.

Key Features

API-Native Architecture: Every configuration, integration, and feature is exposed as an API, giving developers granular control with thousands of customization points.
Bring Your Own Models: Plug in your own API keys for transcription, LLM, or TTS providers—or connect self-hosted models—for full stack flexibility.
Multilingual Support: Engage callers in 100+ languages including English, Spanish, and Mandarin, enabling truly global voice agent deployments.
Automated Voice Testing: Design test suites of simulated voice agents to identify hallucination risks and quality issues before going to production.
Enterprise-Grade Reliability: 99.99% uptime, sub-500ms latency, SOC2/HIPAA/PCI compliance, and AI guardrails ensure safe, scalable deployments at any volume.

Use Cases

Automating inbound customer support calls for businesses handling high daily call volumes, reducing engineering hours and operational costs.
Running outbound sales or follow-up call campaigns at scale using AI voice agents that can handle objections and collect structured data.
Building multilingual customer service bots for global companies needing voice support across 100+ languages without separate agent stacks.
Powering healthcare appointment scheduling or patient intake flows with HIPAA-compliant voice AI that integrates with existing EHR systems.
Testing and iterating on voice agent quality with automated simulation suites that catch hallucinations and flow issues before production rollout.

Pros

Highly Configurable: With 4,200+ configuration points and support for custom models and API keys, Vapi adapts to virtually any tech stack or workflow requirement.
Fast Time to Production: Pre-made templates and a streamlined setup let teams go from concept to live voice agent in days, not months.
Strong Developer Community: Over 250,000 developers and 13,000+ support topics mean ample resources, shared knowledge, and community-driven momentum.
Enterprise Compliance Built-In: SOC2, HIPAA, and PCI compliance make Vapi suitable for regulated industries like healthcare and financial services without added overhead.

Cons

Developer-Focused Complexity: The platform's depth and API-first design may present a steep learning curve for non-technical users or small teams without dedicated engineering resources.
Cost at Scale: While entry is accessible, running millions of calls with premium model integrations can become expensive; pricing transparency for high-volume use requires direct inquiry.
Dependency on Third-Party Models: Optimal performance often relies on bringing external LLM, TTS, or transcription keys, adding additional vendor management overhead.

Frequently Asked Questions

Vapi is a developer platform for building, testing, and deploying conversational voice AI agents. It provides the infrastructure, APIs, and tooling needed to power inbound and outbound phone call automation at scale.

Vapi supports 100+ languages out of the box, allowing voice agents to seamlessly communicate with callers in English, Spanish, Mandarin, and many more languages without additional configuration.

Yes. Vapi supports bring-your-own-model configurations, letting you supply your own API keys for transcription, LLM, and text-to-speech providers, or connect self-hosted models directly.

Yes. Vapi is SOC2, HIPAA, and PCI compliant, making it suitable for deployments in regulated industries such as healthcare and financial services.

Developers can try Vapi in minutes using pre-made templates and the interactive dashboard. Full production deployments typically take days, with enterprise customers receiving support from a dedicated forward-deployed engineer to go live in a week.