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Retell AI

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Build, deploy, and manage human-like AI voice agents for automated phone call and chat automation.

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Reviews onG2
1472 reviews tracked

The Bottom Line

Entry price

Free plan available, paid tiers above

Biggest pro

Delivers highly natural and human-like AI conversations with low latency.

Biggest con

Pricing model is usage-based and can become complex with multiple add-ons and LLM choices.

TL;DR - Retell AI

  • Automates phone calls, chat, and SMS with human-like AI voice agents.
  • Features low-latency, natural conversations powered by LLMs and proprietary turn-taking models.
  • Offers a configurable framework with real-time function calling, comprehensive testing, and analytics.
Pricing: Free plan available
Best for: Growing teams
4.8/5 across review platforms

What is Retell AI?

Editorial review
Retell AI is an advanced conversational AI platform designed to automate customer interactions across phone calls, chat, and SMS. It enables businesses to create and deploy AI voice agents that sound human, execute tasks, and scale effortlessly. The platform leverages large language models (LLMs) to deliver natural, low-latency conversations, handling complex, multi-turn interactions and edge cases that traditional IVR or IVA systems cannot. This platform is ideal for businesses looking to streamline operations, enhance customer service, and reduce support costs by automating routine requests and qualifying leads. It offers a highly configurable agentic framework with drag-and-drop capabilities, built-in guardrails, and real-time function calling for tasks like appointment booking, payment processing, and record updates. Retell AI also includes comprehensive testing and analytics tools to ensure continuous improvement and performance monitoring of AI agents, making it suitable for various industries and use cases, from customer service and lead qualification to debt collection and appointment setting.

Available on: Web

how we evaluateSourceretellai.com ↗

Pros & Cons

Pros

  • Delivers highly natural and human-like AI conversations with low latency.
  • Offers extensive configurability and control over AI agent behavior.
  • Supports complex, multi-turn conversations and handles edge cases effectively.
  • Provides robust testing, QA, and analytics tools for continuous optimization.
  • Integrates with existing telephony and offers multi-channel communication capabilities.

Cons

  • Pricing model is usage-based and can become complex with multiple add-ons and LLM choices.
  • Requires some technical understanding for full customization and API integration.
  • Reliance on external LLMs means performance can be influenced by third-party models.

Ratings Across the Web

4.8(1,472 reviews)
G21,472 reviews
4.8/5

Ratings aggregated from independent review platforms. Learn more

Preview

Key Features

LLM-based human-like voice agentsProprietary Voice AI Orchestration for low-latency conversationsUltra-realistic voice generationIntelligent turn-taking modelConfigurable agentic framework with drag-and-drop interfaceReal-time function calling (e.g., booking appointments, processing payments)Streaming RAG (Retrieval Augmented Generation) for knowledge base integrationAutomatic knowledge base syncing with website content

Pricing

Freemium

Retell AI offers a generous free tier with optional paid upgrades for advanced features.

View pricing

Reviews

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4.8/5

Across 1,472 verified user reviews on G2

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Retell AI FAQ

How does Retell AI enable automated phone call and chat automation?

Retell AI allows businesses to build, deploy, and manage human-like AI voice agents that can automate customer interactions across phone calls, chat, and SMS. It uses large language models to handle complex, multi-turn conversations and execute tasks like appointment booking or payment processing.

How does Retell AI compare to AssemblyAI for building conversational AI?

Retell AI focuses on building and deploying highly configurable, human-like AI voice agents for automated interactions, including real-time function calling. While AssemblyAI provides speech-to-text and other audio intelligence, Retell AI offers a complete platform for managing the full lifecycle of conversational AI agents.

What are the main limitations of using Retell AI?

The pricing model for Retell AI is usage-based and can become complex due to various add-ons and choices of large language models. Additionally, full customization and API integration may require some technical understanding, and the performance of agents can be influenced by the third-party LLMs used.

Which teams would benefit most from using Retell AI?

Teams focused on customer service, lead qualification, and operations will find Retell AI beneficial for streamlining processes and reducing support costs. It is also suitable for departments involved in debt collection and appointment setting, as it can automate routine requests and manage complex interactions.

Does Retell AI include a free tier?

Yes, Retell AI offers a free tier for users to get started with the platform. Paid plans are available for those requiring more extensive usage and additional features.

How does Retell AI ensure natural and low-latency conversations?

Retell AI leverages large language models to deliver natural, low-latency conversations, enabling human-like interactions. It is designed to handle complex, multi-turn dialogues and edge cases more effectively than traditional IVR or IVA systems.

Can Retell AI agents integrate with existing business systems?

Yes, Retell AI agents are designed with real-time function calling capabilities, allowing them to integrate with existing systems for tasks such as appointment booking, payment processing, and updating records. It also offers multi-channel communication capabilities and integrates with existing telephony.

Source: retellai.com

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