Retell AI
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What is Retell AI?
Retell AI is an AI tool (by Retell AI Inc.) for building AI voice agents that automate customer service, sales and operations phone calls in contact centers. It replaces rigid IVR menus with natural conversations: the agent listens, understands, responds and takes actions such as booking appointments or updating systems. The company was founded in 2023 in Redwood City, California.
How do you build AI voice agents with Retell AI?
- A drag-and-drop canvas to design every step of the conversation.
- Functions, integrations, call transfers, DTMF, SMS and custom logic.
- Pre-built agent templates and a knowledge base with your business information.
- Simulation testing before going live.
- Your choice of LLM (GPT, Claude, Gemini or a custom model) and voices (ElevenLabs, Cartesia, OpenAI and more).
Where can you deploy Retell AI agents?
Agents handle inbound calls, run outbound campaigns with batch calling, reply over SMS or sit on your website as a widget. You can use Twilio, Vonage or your own telephony, branded caller ID and verified phone numbers to avoid spam flags.
How natural do the agents sound and how fast are they?
The company reports around 600 ms latency, handling of mid-sentence interruptions and natural turn-taking, plus warm transfer to a human when needed. Agents can hold conversations in multiple languages.
What quality and compliance controls does it offer?
It includes post-call analysis, transcripts, AI quality assurance, PII redaction and safety guardrails. Retell states compliance with HIPAA, SOC 2 Type II, GDPR and ISO 27001.
Retell AI pros and cons
- Pro: low latency and natural interruption handling
- Pro: freedom to pick the model, voice and telephony
- Pro: integrations with HubSpot, n8n, Make and GoHighLevel
- Con: choosing among many model, voice and telephony providers takes some evaluation
- Con: complex flows require technical work
Retell AI features and use cases
How to use Retell AI
Retell AI FAQ
What is Retell AI?
Retell AI is a platform for building AI voice agents that answer and place phone calls with natural conversation.
Is Retell AI free?
No, it is billed per call minute, although signup includes free credits for testing. See the pricing section of this page.
Does Retell AI support Spanish and other languages?
Yes, agents can hold conversations in multiple languages, including Spanish.
Does Retell AI have an API?
Yes, it offers an API and webhooks with developer documentation, plus SDKs on GitHub.
Which telephony providers work with Retell AI?
You can use Retell numbers via Twilio or Telnyx, Vonage, or connect your own custom telephony.
Can a Retell AI agent transfer calls to a human?
Yes, the call transfer feature hands the conversation to a human agent mid-call.
Which LLMs does Retell AI support?
You can choose models from OpenAI, Anthropic and Google, or connect a custom LLM.
Is Retell AI HIPAA compliant?
Retell states HIPAA and SOC 2 Type II compliance, and the Enterprise plan offers custom BAAs.
What does Retell AI integrate with?
HubSpot, GoHighLevel, Make, n8n, Twilio and Vonage, plus calendars and CRMs through the API.
What are the best Retell AI alternatives?
On GptZone you can compare it with AI voice agent platforms such as Bland AI, Synthflow and Voiceflow.
Retell AI pricing and plans
Reference price: 0.07 USD · usage based. Source · Verified: November 1, 2026
Pay-as-you-go pricing in US dollars (USD), with no annual contract. Checked on: 01/11/2026.
Pay as you go: voice agents from $0.07 to $0.31 per minute depending on model, voice and add-ons; chat agents from $0.002 per message.
Signup includes $10 in free credits and 20 concurrent calls.
Sample breakdown: Retell voice infrastructure $0.055/min and platform voices $0.015/min, plus LLM and telephony costs.
Enterprise: custom volume pricing, optional dedicated server, SSO, custom BAA/DPA and 24/7 support.
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