A Vapi alternative you create by describing it.
Vapi gives developers an API to build voice agents in code. A Callable starts with a plain-language brief.
Where Vapi fits.
Vapi is a developer-facing voice AI platform. It's built API-first — an API and SDKs for wiring large language models, speech providers, and call logic into code, then deploying through Vapi's own infrastructure.
How the two compare.
Six differences from what both sides publish.
| Aspect | Callable | Vapi |
|---|---|---|
| How you build it | Describe the line in plain language. The builder asks what it can't infer and drafts it. | Configured through Vapi's API and SDKs, in code. |
| Where it runs | Your own phone number, on its own dedicated server. | Vapi's own container hosting for deployed agents; its Scale tier adds a fixed platform fee under an annual contract. |
| Cost visibility | Every call has an itemized receipt: carrier, transcription, model, and voice, each with its source and rate. | Vapi's own hosting is $0.05 a minute; model, speech, and telephony are billed separately by their own providers, and the Core plan adds $10 per concurrent line each month past the first ten. |
| Testing before live | Drafts run through scripted test conversations before publishing. | Evals check a single decision point in a fixed conversation; Simulations run a full AI-tester conversation in chat or voice, per Vapi's current docs. |
| Who it's for | Teams who want to describe a phone line, not maintain one. | Developers building a voice agent in code, on their own stack. |
| Code required | None — describe it, review the draft, publish. | Yes — an API and SDK integration. |
Sources: vapi.ai — homepage (checked 2026-08-30) · vapi.ai/pricing (checked 2026-09-02) · docs.vapi.ai/test/voice-testing (checked 2026-09-24)
Where to go next.
Describe your line
Tell the builder what calls it should take. It asks what it can't infer, then drafts the line.
Start building →See what it costs
Every call prints a receipt with the source and rate for every layer.
View cost →Watch how it’s built
From brief to published line.
See how it works →
Also compare: Retell AI · Bland AI · Synthflow · Bland AI vs Vapi · Retell AI vs Vapi · All platforms compared
Straight answers about switching from Vapi.
Six questions people ask before moving a line off Vapi.
No. Describe what it should answer and refuse, and what callers need to leave behind. The builder asks what it can’t infer, then drafts and tests the line. There’s no API to wire up or SDK to install first.
Not Vapi’s own SDK wiring specifically, but Callable’s own provider list, per line: OpenAI, Gemini, or Grok to decide what to say; Soniox or Deepgram to hear the caller; Cartesia, ElevenLabs, or Inworld to speak the reply; Twilio or Telnyx to carry the call. The builder sets a default stack; any of the four can be swapped.
On its own dedicated server, shared with no other Callable — not a container inside Vapi’s own hosting tier, split with other deployed agents.
Yes, in place of Vapi’s own Evals and Simulations flow. Before publishing, a draft runs six graded caller scenarios as text conversations through the builder’s playground path, and every transcript is graded. Nothing goes live until you press publish, and every publish is recorded.
About $0.062 a minute on the default stack, at the providers’ published rates, itemized by layer on every call: carrier, transcription, model, voice — see /cost. Vapi’s own hosting is billed separately, at $0.05 a minute, and model, speech, and telephony are billed separately again, by their own providers.
Buy a number in the dashboard and point your line at it — no re-wiring the API integration a Vapi number depends on. Once bought, it’s yours in the dashboard, whether you’re switching from Vapi or starting fresh.
About $0.062 a minute on the default stack, at the providers’ published rates, itemized by layer on every call: carrier, transcription, model, voice. See the price book →
For more on how a Callable is built, the price book, and where a voice line fits in a support queue: How it’s built · The full price book · Where voice agents fit in support
Describe the line you need.