Vapi vs Retell AI: which voice agent platform should you choose?

Vapi vs Retell AI comes down to one trade-off: Vapi gives developers more control over the voice stack at a lower listed hosting fee, while Retell AI gives non-developers a drag-and-drop canvas that is faster to ship on. If you have engineering time and want to own your agents, models and data, choose Vapi; if you want an AI receptionist or call center running this week without writing code, choose Retell AI.

Vapi vs Retell AI at a glance

Sources: Vapi pricing, Retell AI pricing.

How much does Vapi cost compared to Retell AI?

Vapi is cheaper on the listed platform fee: Vapi’s pricing page lists hosting at $0.05 per minute with no minimum minutes, while Retell AI’s pricing page lists pay-as-you-go voice agents at roughly $0.07–$0.31 per minute depending on the model and voice you choose.

The catch is that neither number is your final bill. On Vapi, speech-to-text, LLM, text-to-speech and telephony provider costs are all extra on top of the $0.05/min hosting. Retell itemizes its voice infrastructure at $0.055 per minute, plus the voice and LLM you choose. So a like-for-like comparison depends on which providers and models you wire up on each platform.

Both platforms let you test without committing. Vapi gives new accounts $5 in free credits; Retell AI gives $10 in free credits plus 20 free concurrent calls to start. Retell also states it starts at $0 with no annual contract.

For an illustrative scenario: a 5-person agency prototyping a booking bot for a dental client could burn through both free allowances testing call flows, then pay only for the minutes that actually run on either platform. The agency’s real decision is not the per-minute rate — it is who on the team will build and maintain the agent.

Which is easier to build on, Vapi or Retell AI?

Retell AI is easier to build on for non-developers, because its conversation flows are designed on a drag-and-drop canvas; Vapi is more developer-oriented, so we class it as low-code rather than no-code.

On Retell AI’s canvas you can add functions, integrations, call transfers, DTMF, SMS and custom logic visually. Retell positions itself as an AI call center covering inbound and outbound calls, scheduling and support, and you can monitor calls live and take over when a human is needed. That makes it a practical fit for a small business owner or an ops lead who wants a working phone agent without hiring a developer.

Vapi takes the opposite stance. It handles the real-time voice infrastructure while, in Vapi’s words, you own and operate your agents, models and data. That is a meaningful advantage if your team wants to swap models, tune the conversation flow at a low level, or integrate deeply with your own systems — and a meaningful barrier if nobody on your team writes code.

If you are weighing other builders alongside these two, our roundup of the best AI voice agent platforms for small businesses covers the wider field, and the voice agents category lists every platform we track.

Which is better for agencies, Vapi or Retell AI?

Both platforms explicitly target agencies, and the winner depends on your bench: agencies with developers should pick Vapi for its configurability, while agencies selling turnkey AI receptionists should pick Retell AI for speed of delivery.

Vapi lists agencies reselling voice agents among its best-for use cases, and it offers unlimited agents on every plan — useful when you are spinning up a separate agent per client. Because you own and operate the agents, models and data, a technical agency can build a differentiated stack rather than reselling a commodity setup.

Retell AI lists agencies selling AI receptionists as a core audience too. The drag-and-drop canvas, call transfers and SMS support mean a non-technical account manager can configure a client receptionist, and live call monitoring with human takeover gives you a safety net during rollout.

For an illustrative scenario: an agency pitching a 30-location dental group on after-hours booking could demo on Retell AI within days using the free credits and 20 concurrent calls, then decide whether the client’s scale justifies rebuilding on Vapi for tighter cost control at volume. For more agency-focused options, see our guide to the best no-code AI agent builders for agencies.

What about enterprise plans and reliability?

Both vendors sell custom enterprise packages, but they emphasize different things: Vapi sells paid success packages with uptime SLAs of 99% or 99.9%, while Retell AI’s enterprise tier focuses on volume pricing.

If your phone agents are revenue-critical — say, a clinic where a missed call is a missed appointment — Vapi’s published SLA options give you a concrete reliability commitment to put in a contract. If your main concern is cost at scale, Retell’s volume pricing is the lever to negotiate.

Neither platform publishes enterprise rates, so treat both as custom quotes and ask each vendor to price your actual expected minutes before you commit.

Can you self-host Vapi or Retell AI?

No — neither Vapi nor Retell AI offers self-hosting; both are cloud services billed per minute. If data residency or on-premise deployment is a hard requirement, you will need a different category of tool.

Our guide to the best self-hosted AI agent builders covers open-source options such as Flowise and Dify, though those are general agent builders rather than dedicated voice platforms, so you would be assembling the telephony and speech layers yourself.

How do you choose between Vapi and Retell AI?

Choose by answering three questions in order:

1. Who will build and maintain the agent? If the answer is a developer, Vapi’s control and $0.05/min hosting fee win. If the answer is an ops person or founder, Retell AI’s canvas wins.
2. What are you building? A custom phone agent deeply integrated with your own systems favors Vapi. A booking, intake or support line that needs to go live fast favors Retell AI.
3. How will you validate it? Use Vapi’s $5 credits or Retell’s $10 credits and 20 free concurrent calls to run your real call scripts before paying anything.

One honest caveat: our hands-on testing notes for both platforms are still pending, so this comparison is based on the vendors’ published pricing and feature pages, not our own call-quality benchmarks. We recommend running the same test script on both free tiers before deciding.

Bottom line

Vapi vs Retell AI is a control-versus-convenience decision. Pick Vapi if you have developers and want the lower listed hosting fee, unlimited agents and ownership of your models and data; pick Retell AI if you want a drag-and-drop canvas, live call monitoring and the fastest path to a working AI phone agent. Both are pay-as-you-go with free credits, so you can validate your choice on real calls before spending anything.

What to ask next:

• What are the best AI voice agent platforms for small businesses beyond these two?
• How does Retell AI compare to chat-first builders in our Botpress vs Voiceflow breakdown?
• Which platforms make our list of the best no-code AI agent builders overall?