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Side-by-side facts to help you choose between voice agents or platforms.

Developer API

Vapi

Developer-oriented voice agent platform for building phone agents with custom workflows and integrations.

Voice Agent Platform

Voice AI platform for building low-latency phone agents across support, scheduling, and sales workflows.

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Attribute	Vapi	Retell AI
Platform type	Developer API	Voice Agent Platform
Pricing	$0.13-$0.33/min $0.05/min hosting + provider costs	$0.07-$0.31/min $0.07-$0.31/min; custom pricing available
Test it	Free trial	Free trial
Calls	Inbound, Outbound	Inbound, Outbound
Human handoff	Yes	Yes
Setup difficulty	Technical	Medium
Use cases	Customer Support Appointment Scheduling Lead Qualification Outbound Calling	Customer Support Appointment Scheduling Lead Qualification AI Receptionists
Useful for	• Developer teams • Custom call workflows • Voice AI prototypes	• Fast voice prototypes • Support call automation • Scheduling workflows
Integrations
Twilio
Zapier
Custom API
CRM
Calendar

Vapi: Customer Support
Appointment Scheduling
Lead Qualification
Outbound Calling
Retell AI: Customer Support
Appointment Scheduling
Lead Qualification
AI Receptionists

Vapi: • Developer teams
• Custom call workflows
• Voice AI prototypes
Retell AI: • Fast voice prototypes
• Support call automation
• Scheduling workflows

Enter your call volume once and see Vapi and Retell AI priced at the same usage, ranked alongside every other platform.