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Retell AI

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Automate customer interactions with human-sounding AI voice agents

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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)

Retell AI holds an aggregate rating of 4.8 out of 5 from 1,472 reviews across G2, last checked March 19, 2026.

G21,472 reviews
4.8/5

What people say

“Retell AI makes it incredibly easy to connect AI voice agents to real phone numbers. The SIP trunking integration with Twilio works seamlessly, and the dashboard makes it simple to assign agents to inbound numbers.”via G2

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 handle appointment booking during a customer call?

Retell AI uses real-time function calling to execute tasks like appointment booking during a conversation, allowing the AI agent to access calendars, check availability, and schedule appointments without transferring the caller. The platform’s agentic framework supports multi-turn interactions to handle any edge cases that arise. This makes it suitable for automating appointment setting across various industries.

How does Retell AI compare to Bland AI in terms of conversation naturalness?

Retell AI is designed to deliver highly natural and human-like AI conversations with low latency, leveraging large language models for complex interactions. While Bland AI also offers voice AI, Retell AI emphasizes extensive configurability and control over agent behavior, along with robust testing and analytics tools. The platform’s ability to handle edge cases and multi-turn conversations sets it apart.

What are the main trade-offs of using Retell AI's usage-based pricing model?

Retell AI’s usage-based pricing can become complex with multiple add-ons and LLM choices, making it harder to predict costs. Additionally, the platform requires some technical understanding for full customization and API integration. Performance can also be influenced by the external LLMs it relies on.

Which teams benefit most from Retell AI's configurable agentic framework?

Customer service and operations teams benefit most from Retell AI’s configurable agentic framework, as it allows them to automate routine requests and qualify leads without deep coding. The drag-and-drop capabilities and built-in guardrails make it accessible for non-technical team members, while developers can leverage the API for deeper integration. It is suitable for industries like debt collection, appointment setting, and support.

How is Retell AI priced?

Retell AI is available on a free tier, with paid plans that offer more usage and features. The pricing model is usage-based, meaning costs scale with call volume and additional add-ons. This structure allows businesses to start small and expand as their needs grow.

Can Retell AI integrate with existing telephony systems?

Yes, Retell AI integrates with existing telephony and supports multi-channel communication including phone calls, chat, and SMS. This allows businesses to deploy AI voice agents alongside their current infrastructure without disruption. The platform also offers real-time function calling for tasks like payment processing and record updates.

Does Retell AI provide tools for testing and improving AI agent performance?

Retell AI includes comprehensive testing, QA, and analytics tools for continuous optimization of AI agents. These tools allow teams to monitor conversations, identify edge cases, and refine agent behavior over time. This ensures that the AI voice agents maintain high performance and natural interaction quality.

Source: retellai.com

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