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Vapi

Voice AI agents for developers

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Integrate voice into your apps with VideoSDK’s AI Agents. Connect your chosen LLMs & TTS. Build once, deploy across all platforms.

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Overview

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Vapi is a highly configurable API platform empowering developers to build, test, and deploy advanced voice AI agents. Seamlessly integrated into existing infrastructure, Vapi is trusted by trailblazing startups and Fortune 500 companies alike to scale phone operations efficiently, handling over 400,000 daily calls. By automating both inbound and outbound call processes, Vapi saves hundreds of engineering hours monthly. Designed as a developer-first solution, it offers advanced customisation and low-latency performance for sophisticated conversational AI systems.

How It Works

  • Choose your workflow: Explore thousands of pre-made templates or design a custom workflow. Use the visual workflow builder to connect prompts and set conditional logic for tailored conversations.
  • Plug it in: Integrate the voice AI agent into your telephony system, website, or mobile app seamlessly.
  • Done: Deploy to handle millions of calls, and monitor their performance for optimal operation.

Use Cases

Outbound Sales & Lead Qualification
Automate sales workflows with AI agents to qualify leads, handle objections, and schedule appointments. Integrate with CRMs and implement advanced branching logic for follow-up sequences.
Inbound Customer Support
Deliver 24/7 automated customer support via phone, handling queries like account verification and balances, and resolving common requests across sectors such as banking and finance.
Automated Call Handling
Enable voice AI agents to make, receive, and manage telephone calls for any business process, streamlining communication and improving operational efficiency.

Features & Benefits

  • Multilingual support (100+ languages)
  • Automated testing with simulated voice agent test suites
  • Bring your own models (transcription, LLM, text-to-speech, self-hosted)
  • Predefined and custom call functions (e.g., transferCall, endCall, dialKeypad)
  • A/B testing for continuous optimisation
  • API-native design for flexible configurations and integrations
  • Tool calling to connect existing APIs as intelligent agent tools
  • Sub-500ms latency for ultra-fast call interactions
  • 99.9% uptime for enterprise-grade reliability
  • Enterprise security & compliance (SOC2, HIPAA, PCI)
  • AI guardrails to prevent hallucinations
  • Comprehensive customisation (NLP, knowledge retrieval, contextual awareness, custom personalities)

Target Audience

  • Developers & engineers: Those needing a highly configurable API platform for building and deploying voice AI agents.
  • Businesses of all sizes: From startups to Fortune 500s, especially in the Computer Software industry.
  • Small to large enterprises: From 1-10 up to 5,000+ employees aiming to integrate voice AI for scalable phone operations.

Pricing

  • Core Call Cost: Flat £0.05 per minute, prorated to the second.
  • Provider Costs: Speech, transcription, and model costs are charged at cost; bring your own API keys is supported.
  • Phone Numbers: £2 per month for purchased numbers.
  • Starter Credits: New accounts receive £10 free credit; no card required.
Plans:
  • Ad-Hoc: Pay-as-you-go, £0.18 per overage minute.
  • Agency: £400/month includes 3,000 minutes; overage at £0.18/min.
  • Startup: £800/month includes 7,500 minutes; overage at £0.16/min.
  • Enterprise: Custom pricing for high volume and special requirements.

FAQs

What is Vapi?

Vapi is a developer-first platform offering a highly configurable API to build, test, and deploy advanced voice AI agents. It enables businesses to automate and scale their phone operations with human-like conversational AI.

How is Vapi more cost-effective for my organisation?

While some costs (Speech-to-Text, LLM, Text-to-Speech) are incurred with providers like Deepgram, OpenAI, or ElevenLabs, Vapi passes these through at no extra fee. Vapi's fee covers the ongoing maintenance and improvement of its voice AI orchestration, saving organisations significant engineering time and resources.

What is the difference from other AI voice competitors?

Vapi is a middleware layer, allowing companies to bring their own underlying infrastructure for transcription, intelligence, and voice models. Its API-native approach allows extensive customisation and integration, unlike more bundled, less flexible alternatives.

I need holistic customisation, what types of support does your platform offer?

Vapi enables customisation via API-native design: bring your own models, use tool calling, run A/B experiments. Support options include community Discord, detailed documentation, and, for enterprises, 24/7 hands-on support with direct engineering engagement.

Is it difficult to set up?

Vapi is designed for easy deployment — try in minutes, deploy in days. Thousands of pre-made templates and a visual workflow builder lower the barrier, abstracting complexity while giving you the flexibility to tailor your solution.

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