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Voice agents

Retell AI ✓

Build human-like voice AI agents in a day

Source rating 5.0 (3) 1.6k views 716.9K/mo traffic 23 saves 3 comments Paid
Agent Voice AI Conversational AI
More categories (4)
AI Development Turn-Taking Model AI Agents Voice agents
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from $0.01

Verdict

A quick read before you dig into the full page.

Best if
Build human-like voice AI agents in a day
Skip if
Limited template variety
Pick this when
Can execute complex tasks

Considering Speechmatics | AI Voice Agents instead? Compare side by side

Overview

Retell AI assists developers in creating advanced conversational Voice AI that mimics human interactions. The tool is equipped to execute complex tasks, follow instructions, and can integrate with any Language-Level Models (LLMs).

With Retell AI, developers can build, test, deploy, and monitor their voice AI agents at scale. In addition to these, the platform provides an array of features such as pre-built templates, stateful multi-prompt agents, and single-prompt agents allowing for the testing and deployment of complex workflows with relative ease.

But, what sets Retell AI apart is its proprietary turn-taking model which powers an interactive conversation experience that enables AI to effectively handle interruptions.

The platform also offers post-call analysis, sentiment analysis, and task completion status to assess the performance of deployed AI. In summary, Retell AI provides a robust and flexible environment for the creation and deployment of human-like voice AIs adaptable to diverse use cases.

Retell AI website

Access & connections

Where you can use Retell AI.

Platforms

Web

Capabilities

What this tool accepts, produces, and is strongest at.

Input

  • API
  • Tabular
  • Audio

Output

  • Audio
  • API

Pros & cons

Pros

  • Can execute complex tasks
  • Can follow instructions
  • Integrates with any LLMs
  • Build, test, deploy, monitor at scale
  • Stateful Multi-Prompt Agents
  • Single-Prompt Agents
  • Enables testing and deployment of complex workflows
  • Proprietary turn-taking model
Show 30 more
  • Handles interruptions effectively
  • Post-call analysis
  • Sentiment analysis
  • Task completion status monitoring
  • Flexible and robust environment
  • Near real-time interaction
  • Mimics human interactions
  • Completes tasks in a day
  • Interactive conversation experience
  • Multi-lingual support
  • HIPAA compliance work in progress
  • SOC Type II certification in progress
  • Telephony integration: Twilio, Vonage, SIP
  • Can be deployed anywhere
  • End-of-turn detection feature
  • Interruptibility feature
  • Voice cloning support
  • 800ms response time
  • Human-like voices
  • Web App and Mobile deployment
  • Engaging and lifelike voices
  • Comprehensive Agent Testing
  • Backed by Y Combinator
  • Latency tracking
  • Stable voice service
  • Effortlessly scale call volume
  • Voice agents interact like humans
  • Supports interaction with agent while testing
  • Ability to save test cases for future use
  • Open source Client SDK

Cons

  • No open source access
  • Limited language support
  • 800ms Latency
  • Requires LLM integration
  • Limited template variety
  • Proprietary turn-taking model
  • Unclear pricing model
  • May not handle unique interruptions
Show 1 more
  • SOC Type II certification WIP

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Releases 1

Initial release February 22, 2024 Current
Initial release of Retell AI.

Imported reviews 3

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Paul Mar 25, 2026 v@ initial release

If calls are handled but not converting better than humans,
you’re burning cost at scale -> ~20–30% pipeline leak.

Are your agents outperforming human conversion rates?

zehaan khan Sep 26, 2025 v@ initial release

been using retell ai for last year....

Built over 50 voice agents for mysel and clients....

easy to use ...

Soban Ajmal May 21, 2025 v@ initial release

Fantastic tool. Compared to Vapi in terms of voice quality and built-in setup, it’s outstanding.

FAQ 12

What is Retell AI?
Retell AI is a powerful tool that aids developers in creating advanced conversational Voice AI that simulates human interactions. The platform is capable of executing complex tasks, following instructions, and integrating with any Language-Level Models (LLMs). With Retell AI, developers can create, test, deploy, and monitor voice AI agents on a large scale.
What is unique about Retell AI?
Retell AI stands out due to its proprietary turn-taking model, which powers an engaging conversation experience and lets the AI to handle interruptions effectively. Furthermore, Retell AI offers post-call analysis, sentiment analysis, and task completion status as additional tools to measure the performance of deployed AI agents.
How does Retell AI's turn-taking model work?
The turn-taking model of Retell AI is a proprietary system that fuels an immersive conversational experience. It ensures the AI's capability to manage interruptions effectively, fostering a more human-like dialogue.
What kind of tasks can Retell AI execute?
Retell AI is designed to perform complex tasks in a human-like conversational manner. This includes interacting like a human, following instructions, and executing complex workflows. These tasks are accomplished using pre-built templates, stateful multi-prompt agents, and single-prompt agents.
How does Retell AI handle interruptions?
Retell AI's unique turn-taking model enables the AI to handle interruptions effectively. This functionality allows the AI to manage and respond to unexpected input or interjections during the conversation, thus fostering an interactive dialogue.
What kind of Language-Level Models (LLM) can Retell AI integrate with?
Retell AI can integrate with any Language-Level Models (LLMs). This feature gives developers the flexibility to use their preferred LLMs for creating, testing, and deploying voice AI agents.
Can I use the pre-built templates in Retell AI?
Yes, Retell AI provides pre-built templates. These templates expedite the process of building, testing, and deploying complex workflows in AI development.
What is the difference between a stateful multi-prompt agent and a single-prompt agent in Retell AI?
In Retell AI, a stateful multi-prompt agent is capable of managing sophisticated workflows that demand a series of prompts. On the other hand, a single-prompt agent handles tasks that require only one prompt. Both agents contribute to the versatility of Retell AI in dealing with different complexities of voice AI workflows.
What tools does Retell AI provide for testing and deploying workflows?
Retell AI provides a suite of tools for testing and deploying workflows. These include pre-built templates, stateful multi-prompt agents, and single-prompt agents. Additionally, the platform facilitates comprehensive agent testing and allows the saving of test cases for future use.
What kind of analysis does Retell AI provide for assessing AI performance?
Retell AI provides post-call analysis, sentiment analysis, and task completion status to assess AI performance. These analytical tools offer valuable insights into the performance of the voice AI agents, from customer sentiment to task completion rate and latency tracking.
What role does Retell AI play in AI deployment and monitoring?
Retell AI plays a central role in AI deployment and monitoring. It allows developers to build, test, deploy, and monitor their voice AI agents on a large scale. Additionally, the tool provides crucial metrics for monitoring the performance of the deployed AI, including latency tracking, sentiment analysis, and task completion status.
How quickly can I get a response from Retell AI?
Retell AI offers an impressive ~800ms response time. This near-real-time interaction is crucial in delivering a conversation experience that mimics human dialogues.
Retell AI from $0.01
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