Vapi

Overview

Vapi is a platform for building voice AI agents that hold phone or web calls. Developers configure an assistant with a language model, a voice and a transcriber, then connect it to a phone number or a web client. The platform manages the real-time audio pipeline, including turn-taking and interruptions, and supports calling tools or external APIs during a conversation. Vapi suits developers and technical teams who want to build custom voice agents and choose their own providers for speech, language models and telephony. Some setup is required, including prompt design, testing call flows and handling edge cases such as background noise. Costs combine platform usage with the underlying providers, so the total per minute depends on your choices.

Key features

• Phone and web voice assistants
• Choice of model, voice and transcriber providers
• Tool and API calls during conversations
• Call logs and analytics
• Interruption and turn-taking handling

Pros

• Flexible choice of underlying providers
• Well suited to custom developer builds

Cons

• Requires developer setup and call testing
• Total cost spans the platform and several providers

Use cases

• Inbound appointment booking line
• Outbound lead qualification calls
• Support call triage

Pricing

Usage-based billing with a starting tier; underlying provider costs apply. Check the pricing page for current prices.

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