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Retell AI

Retell AI

Retell AI

Main Task


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.

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Pros & Cons


  • 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
    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


  • 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
    SOC Type II certification WIP

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