Voice Agents · Head-to-head
Retell AI vs Vapi
Retell AI and Vapi are both voice agents. Retell AI is Build AI phone agents with configurable conversation flows and call transfers, while Vapi is build phone and web voice agents with configurable models and tools. Here's an independent, side-by-side look at how they compare — and which fits.
Build AI phone agents with configurable conversation flows and call transfers.
Visit Retell AI →Retell AI and Vapi are both commercial voice agents. GitHub stars don't measure commercial adoption, so weigh them on pricing model, capabilities, and how you want to buy — not on a star count.
Side by side
| Spec | Retell AI | Vapi |
|---|---|---|
| Type | Platform | Platform |
| Model | Commercial | Commercial |
| Pricing | Paid product | Paid product |
Teams configuring AI phone conversations and transfer behavior through a managed platform.
Teams building phone or web voice agents that need configurable model providers and integrations with existing APIs.
About Retell AI
Retell AI is a managed platform for building AI phone agents. Its conversation-flow tools support cold, warm and agentic warm transfers, with configurable ring duration. Transfer behavior can depend on the telephony provider. Measure latency and successful handoffs on representative calls rather than assuming a universal response time.
Full Retell AI profile →About Vapi
Vapi is a managed platform for creating phone and web voice agents. Its documentation covers dashboard-based phone-agent setup, API and SDK integrations, and configurable speech and language-model providers. Evaluate call transfers, tool failures and the complete service cost against your own call scenarios.
Full Vapi profile →Frequently asked
- What's the main difference between Retell AI and Vapi?
- Both are voice agents built for a similar job; the differences are subtle — compare them on pricing and delivery model in the table above.
- Is Retell AI or Vapi better?
- Neither is universally better. Retell AI is the stronger fit for Teams configuring AI phone conversations and transfer behavior through a managed platform; Vapi for Teams building phone or web voice agents that need configurable model providers and integrations with existing APIs. Use the side-by-side specs to decide by your own constraints.
- Is Retell AI or Vapi free?
- Retell AI is a paid product; Vapi is a paid product.
- Which is more popular, Retell AI or Vapi?
- We rank open-source projects by GitHub adoption, but at least one of these is a commercial product and stars don't measure commercial adoption — so compare them on capabilities and pricing instead.
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