Vapi vs Retell AI: which voice platform fits your team

Vapi vs Retell is the comparison most developers make when they start building voice agents, because the two platforms overlap more than any others. Both let you create phone agents, connect numbers and call your own APIs mid-conversation. They differ in how much they lean on code, how you design a call, and how much they decide for you.

A note on where we stand: we make Calldone, a managed AI phone agent service that is an alternative to both, aimed at businesses that do not want to build. We have no stake in which of these two you pick. Every claim about them comes from their own sites and docs, checked on October 13, 2026, and we don't list their prices.

Vapi vs Retell AI at a glance

What is the difference between Vapi and Retell AI?

The main difference is the default way of building. Vapi starts from the API: you compose an agent from the transcriber, model and voice you choose and manage it like code. Retell AI starts from the agent: you write one prompt or draw a conversation flow on a canvas, and reach for the API when you need it. Both end up as phone agents that call your tools.

Pricing structure differs in detail too. Vapi's pricing page says provider costs pass through and Vapi adds a platform fee that depends on your plan. Retell's pricing page builds the per-minute cost from the model, voice infrastructure, voice, telephony and optional add-ons, and offers a cost estimator. In both cases the total depends on your choices, so model a real month of calls on each.

Is Vapi or Retell better for developers?

Vapi is usually the better fit for developers who want maximum control, and Retell for developers who want good defaults with escape hatches. Vapi's docs cover Web and Server SDKs, a CLI with local webhook forwarding, and a config-as-code repository for promoting assistants and squads across environments. That suits teams that live in pull requests.

Retell's docs cover typed TypeScript and Python SDKs, a REST API, a Web SDK for browser calls and a custom LLM mode in which Retell handles telephony, transcription and turn-taking while your own WebSocket server writes each reply. Agent versions can be tagged for production and staging. That suits teams that want to own the brain but not the plumbing.

One practical note: Vapi's docs say its Workflows feature was retired by August 18, 2026, with Assistants or Squads recommended instead. Retell still offers both single-prompt and node-based conversation flow agents and recommends starting with the single prompt.

Which is easier for non-developers?

Retell AI is easier for non-developers. Its site describes a no-code studio where you design each step on a drag-and-drop canvas, and its docs describe Conductor, an assistant inside the dashboard that proposes edits, investigates calls and runs simulation tests. Vapi has a dashboard, but its pitch, docs and examples assume someone comfortable with APIs.

Easier is relative, though. On either platform a non-developer still has to write instructions that survive real callers, connect a calendar or CRM, and read transcripts to fix mistakes. If that is the hard part for you, our explainer on how an AI voice agent works shows what each piece does.

Phone numbers, integrations and languages

Phones. Vapi's docs say you can create free US numbers for inbound calls, and import your own numbers from Twilio, Telnyx, DIDWW or a SIP trunk for outbound or international calling. Retell's docs describe buying US and Canada numbers directly, calling 15 countries from them, and connecting other carriers through SIP. Retell also lists branded caller ID and verified numbers to reduce spam flags on outbound calls.

Integrations. Vapi's homepage shows a long list of model and voice providers alongside business tools such as Google Calendar, Salesforce, HubSpot, GoHighLevel and Zapier. Retell's docs offer built-in tools for Cal.com, HubSpot, Salesforce and Zendesk, and both support custom API calls and MCP servers for anything else.

Languages. Vapi handles multilingual calls through transcribers with automatic detection, naming Deepgram, Google and Gladia. Retell lets you select a set of languages per agent and is candid that a single-language agent is the most accurate, recommending one agent per language for closely related languages such as Cantonese and Mandarin.

When to pick Vapi, and when to pick Retell AI

• Pick Vapi if you want to swap providers freely, keep agents in Git, split calls across Squads, or build voice into your own product with its SDKs.
• Pick Retell AI if product or operations staff will edit call flows, you want numbers and branded caller ID from one place, or you want to run your own model behind a managed voice layer.
• Pick either for common jobs such as appointment booking, lead qualification and customer support; both sites describe those use cases.
• Look elsewhere if you need a built-in agency white-label workspace (see our Synthflow alternatives) or one vendor for the entire stack (see our Bland AI alternatives).

If neither feels right, our list of Vapi alternatives and the wider roundup of AI voice agent platforms cover the rest of the field.

Compliance: what each site claims

Both companies make compliance claims; neither is something we can verify for you. Vapi's homepage lists HIPAA and PCI among the standards it says it meets, and its pricing page offers HIPAA as an optional add-on with a Business Associate Agreement. Retell's homepage says it is fully compliant with HIPAA, GDPR and ISO 27001 among other standards, and lists SSO, personal-information redaction and role-based access for enterprise.

If you handle health or payment data, ask each vendor for the signed agreement and the audit reports that cover your plan, in writing, before a single live call.

If you don't want to build at all

Some people reach this comparison as business owners, not engineers, after hearing that an AI agent could answer their phones. For them, both platforms are a means to an end. A managed service skips the platform decision: Calldone's team holds a short onboarding call, then configures the agent, tunes its voice, connects Google Calendar or a CRM such as GoHighLevel, and tests the flow with you before it goes live.

You keep your existing number and forward calls to the agent, as explained in our guide to keeping your business number. Each call comes back with a recording, a transcript and a summary, and plans are listed on our pricing page.

For builders, the honest summary is that Vapi and Retell AI are both capable, and the better one is whichever matches how your team likes to work. Build the same agent on both for a day and the answer is usually obvious.