Retell AI

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Retell AI provides a conversational speech API for ultra-realistic voice interactions in applications.

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What is Retell AI?

Retell AI is a platform that offers a conversational speech API designed to enhance large language models (LLMs) by enabling human-like voice interactions in applications. It aims to help developers create Voice AI that replicates natural conversations by combining speech-to-text, LLMs, and text-to-speech components. Some key features of Retell AI include ultra-realistic voices, interruption handling, low latency response times, customizability, and easy integration with developers' LLMs and frontends. The platform is backed by Combinator and emphasizes delivering fluid, lifelike conversational experiences. It is positioned to shape the future of conversational Voice AI by providing engaging and lifelike voice interactions.

Who created Retell AI?

Retell AI was founded by Peer Richelsen, Tyler Bosmeny, and Rajat Suri, who are former executives at various tech companies. The company aims to revolutionize Voice AI by providing a platform that enhances large language models for human-like voice interactions. Backed by Combinator, Retell AI offers features like ultra-realistic voices, interruption handling, low latency, and easy integration, shaping the future of conversational Voice AI.

What is Retell AI used for?

Enhancing large language models (LLMs) for human-like voice interactions in applications
Developing Voice AI for natural, human-like conversations
Combining speech-to-text, LLMs, and text-to-speech components for Voice AI
Streamlining voice interactions in applications
Customizing voice AI features like noise reduction and sentiment analysis
Handling interruptions smoothly for engaging voice interactions
Integrating with existing LLMs and frontend applications
Creating ultra-realistic voices for engaging interactions
Providing low-latency response times for natural conversation flow
Enabling developers to set up voice interactions quickly

Who is Retell AI for?

Developers
Voice AI developers

How to use Retell AI?

To use Retell AI, follow these comprehensive steps:

Accessing the Platform: Visit the Retell AI website and go to the dashboard. There, you can create an agent using a prompt without the need for code, and even connect it to a phone number.
Exploring Demo and Documentation: For a quick trial, utilize the provided dashboard to create an agent. If you aim to use it in production, refer to the detailed documentation with tutorials available on the website.
Integration with Twilio: You can connect Retell AI with Twilio for making phone calls. An open-source demo repository is provided to help set up Twilio swiftly, and other providers like Vonage can also be utilized.
Compliance and Security: Retell AI is compliant with HIPAA regulations and is in the process of obtaining SOC2 Type II certification, ensuring privacy and security are prioritized.
Building AI Voice Agents: The platform offers powerful features like a proprietary Turn-Taking model, interruption handling, and near real-time interaction for creating AI voice agents that interact like humans.
Voice Customization: Benefit from engaging and lifelike voices, multi-lingual support for 7+ languages, and real-time data insights to enhance user experiences.
Pricing Plans: Choose from flexible pricing options, including a pay-as-you-go model with different rates based on usage and an Enterprise Plan for larger volumes and customized needs.
Support and Community: Enjoy access to a dedicated support team through a premium private Slack channel and prompt engineering support to assist with any queries or technical assistance needed.

By following these steps, you can leverage Retell AI's features to build, test, deploy, and monitor AI voice agents efficiently and effectively.

Pros

Ultra-Realistic Voices: Provide human-like voices to make interactions engaging and lifelike.
Interruption Handling: An intelligent mechanism that ensures smooth transitions between speakers.
Low Latency: Approximately 800ms response time for natural conversation flow.
Customizability: Highly configurable features like Live ASR Transcript, noise reduction, and voice cloning.
Easy Integration: Simple steps to integrate with existing LLMs and frontend applications.

Cons

The document does not provide specific cons or missing features for using Retell Ai.

Pros

Cons

Ultra-Realistic Voices: Provide human-like voices to make interactions engaging and lifelike.
Interruption Handling: An intelligent mechanism that ensures smooth transitions between speakers.
Low Latency: Approximately 800ms response time for natural conversation flow.
Customizability: Highly configurable features like Live ASR Transcript, noise reduction, and voice cloning.
Easy Integration: Simple steps to integrate with existing LLMs and frontend applications.

The document does not provide specific cons or missing features for using Retell Ai.

Retell AI FAQs

How do you calculate the minutes?: Each call rounds up to the nearest millisecond, and the time is accumulated. At the end of the month, we will charge you based on the total time.

If someone is not talking during the call, will you still charge the fee?: Yes, we calculate the entire length of the call because the speech-to-text module continues to operate throughout.

How can I download the invoice and add company details?: This feature is on our roadmap. For now, you can email [email protected] for assistance with this issue.

What is Retell AI's platform for?: Retell AI's platform is designed to help developers create Voice AI that simulates natural, human-like conversations. It combines speech-to-text, LLMs, and text-to-speech with optimizations for low latency and interruption handling.

Is there a trial available for Retell AI's API?: Yes, you can try the API for free. Their website provides an option to 'Try For Free,' allowing developers to test the API capabilities.

How fast are the response times with Retell AI's API?: Response times can be as low as approximately 800 milliseconds, resulting in conversations that are fast and natural.

Who backs Retell AI?: Retell AI is backed by Combinator, a well-known startup accelerator.

What are the benefits of using Retell AI's conversational speech API?: One key benefit is that developers can create Voice AI in a day, greatly reducing development time. The API also handles interruptions and has low-latency response times for a smooth conversational experience.