Vapi AI is a developer platform for building voice-enabled AI assistants that can handle phone calls with minimal human intervention. These assistants use a knowledge base about your business to provide informed, real-time responses that sound natural and human-like.

Vapi AI is designed primarily for developers creating voice AI applications that simulate human conversation using large language models (LLMs). It supports a wide range of complexity, from simple appointment setters to complex virtual assistants, and runs on web, mobile, or embedded platforms.

How does Vapi AI work?

Vapi AI integrates three core technologies: Speech-to-text, which converts user speech into transcribed text; Language model processing, which generates intelligent responses from the text; and Text-to-speech, which converts responses back into natural-sounding speech. Users choose transcription providers such as Deepgram, language models such as ChatGPT, and text-to-speech providers such as PlayHT.

What features does Vapi AI offer?

Vapi AI offers real-time, low-latency (around 500-800 ms) conversations with natural turn-taking and interruption handling. It provides the ability to make and receive calls on any phone number, embeddable voice calls for web applications, and workflow automation with visual decision trees for complex tasks like scheduling and lead qualification. It also features integration with APIs, CRMs, calendars such as Google Calendar and Outlook, and databases, as well as task management, sales pipeline scoring, compliance documentation, and meeting coordination agents. Furthermore, it supports creating and using custom knowledge bases, uploaded as PDFs or connected via APIs, to provide context-aware and accurate answers.

Is it easy to set up?

Yes. Vapi offers a web dashboard and client SDKs allowing you to get started in minutes. Advanced features, such as function calling, require some server-side setup but overall the system is developer-friendly.

How does Vapi AI differ from other voice AI platforms?

Vapi AI emphasizes developer control and customization, focusing on low latency and high reliability for real-time voice communication. Unlike plug-and-play solutions, it enables creation of complex voice workflows, multi-step processes, and deep integration into existing systems.

Does Vapi AI support white-labeling and on-premise deployment?

Yes, Vapi is API-first, allowing white-label integration without Vapi branding. It also supports on-premise deployments for large enterprises and multi-tenancy architectures similar to Stripe’s model.

How do you create and use Knowledge Bases in Vapi AI?

To create and use Knowledge Bases in Vapi AI, you upload documents such as FAQs, support docs, or team notes in PDF format or via API. Then, you associate these files with your assistant in the dashboard under "Knowledge Base" settings and instruct your assistant to reference the knowledge base appropriately through prompts. Finally, you publish the assistant to make these changes live. Vapi automatically creates a query tool with your files for efficient knowledge retrieval.

Security depends partly on how you implement your integration, although Vapi AI has its own security measures. It captures call transcripts, metadata, and audio logs to improve AI performance while integrating with CRM and business tools securely.

What is the pricing of Vapi AI?

Typical costs range between $0.13 and $0.31 per minute, including a hosting fee of $0.05/min plus separate charges for third-party services like transcription and speech synthesis.

How can I get support for Vapi AI?

You can get support by emailing support@vapi.ai or through their official documentation and community forums.

Vapi

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Vapi AI is a platform for developers to create smart, human-like voice AI assistants. These assistants can manage calls, answer questions, and perform tasks using natural conversations, helping businesses scale their phone operations easily.

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Overview Features Use Cases FAQ Pricing

About Vapi

Who It's For

This tool helps developers and businesses, from startups to large companies, build and use advanced voice AI. It allows them to create smart assistants that manage phone calls and conversations, working across websites, apps, and phones.

What You Get

You receive a powerful platform for custom voice AI agents. They support over 100 languages, connect to your systems via APIs, and handle millions of calls reliably with low delay. You can use your own AI models, automate testing, and ensure secure conversations, plus manage complex tasks.

How It Works

Setup is fast. Choose a template or create your own voice AI workflow. Then, connect it to your phone system, website, or app. The platform uses speech-to-text, language models, and text-to-speech to create natural conversations. Once live, your AI agent handles calls, and you can track its performance.

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Features & Capabilities

🤖 Core AI Functionality

Multilingual Support

Engage with agents in over 100 languages including English, Spanish, and Mandarin.

Custom Model Integration

Integrate your own API keys for LLM, transcription, or TTS models, or use self-hosted ones.

Intelligent Tool Calling

Connect external APIs to enable agents to fetch data and perform actions dynamically.

A/B Experimentation

Optimize agent performance by testing various prompts, voices, and conversation flows.

⚙️ Developer Experience & Platform Flexibility

API-Native Design

Access all platform functionalities and configurations through a powerful, developer-friendly API.

Configurable Workflows

Utilize thousands of pre-made templates or design bespoke voice AI interaction flows.

Broad Deployment Options

Seamlessly integrate voice agents across telephony, websites, or within mobile applications.

Automated Pre-Production Testing

Create simulated test suites to proactively identify and mitigate AI hallucination risks.

🛡️ Enterprise-Grade Reliability & Security

High Uptime & Scalability

Ensure enterprise-grade reliability with 99.99% uptime and scale to millions of calls with sub-500ms latency.

Robust AI Guardrails

Implement built-in conversation controls to prevent model hallucinations and maintain data integrity.

Industry Compliance

Meet stringent security standards including SOC2, HIPAA, and PCI for regulated environments.

Dedicated Deployment Assistance

Benefit from a forward-deployed engineering team for tailored support and rapid rollout.

Use Cases

Automating Inbound Customer Support Calls

Businesses struggle with managing high volumes of customer inquiries efficiently. Vapi AI enables organizations to deploy human-like voice agents that handle inbound calls, leveraging custom knowledge bases and API integrations to provide real-time, accurate, and multilingual support, significantly reducing operational costs and improving customer satisfaction.

Customer ServiceFor: Customer Support Managers

Streamlining Sales Lead Qualification and Appointment Setting

Sales teams often spend valuable time on initial lead qualification and scheduling. Vapi AI empowers businesses to deploy intelligent voice agents that automate these tasks by conducting natural conversations, qualifying leads through dynamic workflows, and integrating directly with CRMs and calendars to book meetings, allowing sales reps to focus on high-value engagements.

B2B SalesFor: Sales Development Representatives

Developing Bespoke Voice AI for Complex Operational Workflows

Developers and enterprises need flexible tools to build highly specialized voice AI agents that deeply integrate with existing operational systems. Vapi AI provides an API-first platform with robust tool calling, custom model integration, and workflow automation capabilities, allowing engineering teams to create tailored voice solutions for complex tasks like logistics coordination or internal process automation.

Software DevelopmentFor: AI/ML Engineers

Scaling Enterprise Phone Operations with Reliable Voice AI

Large enterprises require secure, scalable, and reliable voice AI solutions to handle millions of phone interactions without compromising performance or compliance. Vapi AI offers enterprise-grade infrastructure with sub-500ms latency, 99.99% uptime, built-in AI guardrails, and SOC2/HIPAA/PCI compliance, enabling organizations to deploy mission-critical voice agents for various high-volume phone operations.

Large EnterpriseFor: Operations Executives

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