Vapi

Build and deploy AI voice agents that handle phone calls

A developer platform for building voice AI agents that answer and place calls, with configurable prompts, tools, and telephony.

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Overview

Vapi handles the hard parts of a phone-based AI agent: speech in, speech out, interruption handling, and connecting the agent to your systems mid-call. You define the agent behavior and the functions it can call — look up availability, create a lead, transfer to a human. It assumes technical implementation; the payoff is an agent shaped precisely around how your business answers the phone.

What local businesses use it for

After-hours AI answering
Overflow call handling
Outbound appointment confirmation

Key capabilities

Voice agent configuration
Function and tool calling during a call
Telephony integration
Call transfer and escalation
Transcripts and recordings

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Where it is strong

Deep control over agent behavior
Real-time function calling during a call
Transfer rules you define

Trade-offs to know

Requires technical implementation
Per-minute costs need modeling
Quality depends on prompt and data work

Integrations

Twilio and other telephony providersWebhooksCustom APIs

Problems this helps solve

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At a glance

Pricing model: Usage-based
Free plan: No
Free trial: Yes
Best for: Businesses working with a developer or implementation partner
Business size: Small to mid-size with technical support

Usage-based pricing per minute plus underlying model and telephony costs. Verify on the official pricing page.

Editorial rating

Not yet rated. We publish a rating only after hands-on use, so this listing carries the factual overview and nothing invented. What a rating means here.

Ratings are Scale AI Pros editorial assessments based on published vendor information and hands-on implementation experience. They are not user reviews. Our full methodology.