Retell AI

by Retell AI  · Based in United States → — The #1 AI Voice Agent Platform for Automating PHONE Calls
Family Medicine Internal Medicine Pediatrics
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Overview

Retell AI is a voice-first AI platform designed to empower healthcare teams in managing high volumes of patient phone interactions. It enables the creation, deployment, and management of next-generation AI voice agents that offer human-like conversations, execute tasks, and scale effortlessly. The platform aims to automate various aspects of patient communication, including answering calls, routing patients to the appropriate departments or individuals, and booking appointments.

Retell AI differentiates itself from traditional IVR and older IVA voice agents by leveraging Large Language Models (LLMs) to facilitate natural, human-like conversations. This allows for faster setup with minimal configuration, the ability to handle edge cases and unexpected inputs, and support for complex, multi-turn, and outbound use cases. The platform emphasizes low-latency responses (around 600ms) and proprietary turn-taking models to ensure smooth and fluent interactions.

Beyond basic call handling, Retell AI agents can perform real-time function calling to book appointments, process payments, and update records. It also features streaming RAG (Retrieval Augmented Generation) for knowledge bases that automatically sync with existing website content, ensuring accurate and real-time answers. The platform provides comprehensive agent testing with built-in simulation, continuous QA, and performance analytics dashboards for ongoing improvement and insights into call outcomes and agent performance.

Reviewed by Pouyan Golshani, MD — Interventional Radiologist

Key Features

  • Human-standard AI voice agent with ~600ms latency
  • Proprietary Voice AI Orchestration and turn-taking model
  • Highly Configurable Agentic Framework with drag-and-drop builder
  • Real-Time Function Calling for tasks like booking appointments and processing payments
  • Streaming RAG for knowledge base with auto-sync capability
  • Comprehensive Agent Testing with built-in simulation
  • Continuous QA and Performance Analytics Dashboard
  • Integrations with CRMs, calendars, and telephony platforms
  • Batch Call for high-volume campaigns
  • Branded Call ID and Verified Phone Numbers

Use Cases

  • AI Dispatch Service
  • Lead Qualification
  • AI Receptionists
  • AI Customer Service
  • AI Answering Service
  • Patient Triage and Appointment Scheduling

What Physicians Need to Know

Key Capabilities
Retell AI provides AI-powered phone agents that can handle patient calls, automate scheduling, and improve operational workflows in healthcare settings. It offers real-time streaming, barge-in handling for human-like conversations, and supports over 30 languages. The AI agents can book and confirm appointments, send smart notifications and check-ins, conduct pre-screening and surveys, and navigate IVR menus to retrieve information from clinics or pharmacies. It also supports LLM prompt chaining, allowing compatibility with various language models like GPT-4, Claude 3, or custom models. Post-call analysis features include basic transcripts, latency data, and call summaries.
Clinical Utility
Retell AI can significantly reduce administrative workload by automating routine tasks such as appointment booking, confirmations, and follow-ups, freeing up healthcare staff for more complex patient care. It aims to improve patient engagement through timely information and reminders, and enhance patient satisfaction by offering instant, human-sounding responses 24/7, eliminating long hold times. The system can also assist with patient screening, insurance verification, and post-appointment follow-ups, including patient satisfaction surveys and medication reminders.
Integration Options
Retell AI offers seamless integration with HIPAA-compliant Electronic Health Record (EHR) systems such as Epic, OpenDental, Dentrix, ChiroTouch, and eClinicalWorks, enabling automated updates and real-time access to patient data. It supports HL7, FHIR, and REST APIs to sync patient data, insurance information, and appointments across platforms. It can also integrate with telephony providers like Twilio, Telnyx, and Vonage, or use Retell's built-in carrier. Additionally, it integrates with calendar booking systems like Cal.com and automation tools like Keragon, n8n, and GoHighLevel.
Compliance Status
Retell AI is HIPAA-compliant, GDPR-compliant, and SOC 2 Type 1 and Type 2 certified, ensuring secure handling of Protected Health Information (PHI). All interactions are encrypted in transit and at rest. The system enforces role-based access control (RBAC), multi-factor authentication, and audit logging to prevent unauthorized access. Business Associate Agreements (BAAs) are available and can be self-signed on their pay-as-you-go plan. It also offers PII redaction as an add-on.
Pricing Model
Retell AI operates on a flexible pay-as-you-go model, with costs varying based on the voice engine, LLM, and features used. All users start with $10 in free credits, equivalent to about 60 minutes of calls. The base voice engine rate is around $0.07-$0.08 per minute. LLM costs range from $0.006 per minute for basic models to $0.06 per minute for advanced options. Telephony costs are approximately $0.015 per minute. Enterprise plans offer custom pricing and volume discounts, potentially reducing voice pricing to $0.05 per minute or lower for high-volume customers.
User Experience
Retell AI is optimized for developers, offering granular control over call flows and real-time streaming. While it provides a minimal GUI for agent configuration, it lacks a full visual flow builder, drag-and-drop interface, or real-time testing console, meaning non-technical stakeholders may require engineering support. However, users have praised its ease of use for building and deploying AI voice agents, noting impressive call quality, low latency, and natural-sounding conversations.
Implementation Complexity
Retell AI is designed for engineering-led teams, offering powerful infrastructure for LLM-based phone agents rather than a turnkey solution. Its developer-focused nature means that advanced features like prompt changes, context memory, and LLM chaining are handled through the API or SDK, potentially increasing complexity for teams without dedicated engineering resources. However, its no-code approach can mean non-technical team members can handle most configuration tasks, reducing dependency on development resources. The platform's flexibility and customizability are highlighted as strengths for building sophisticated calling solutions.
Evidence Base
Retell AI is used by businesses deploying LLM-powered voice agents in production environments, with one client reportedly replacing 8 team members with a single AI agent. Another client, GiftHealth, achieved 4x operational efficiency by using Retell agents for coordination calls. The platform powers over 50 million real-time AI phone calls every month for more than 3,000 businesses. Case studies demonstrate its application in healthcare for tasks like patient screening, improving patient engagement, and streamlining administrative processes.
Physician Tip

For physicians considering Retell AI, leverage its robust integration with EHR systems like Epic and OpenDental to automate appointment scheduling, reminders, and patient data updates, significantly reducing administrative burden. Utilize its multilingual support to cater to diverse patient populations, enhancing accessibility and patient satisfaction. While the platform is developer-centric, focusing on clear use cases like pre-screening or post-appointment follow-ups can yield immediate benefits. Ensure your IT team is involved early to manage the API/SDK-based configuration and to fully utilize its HIPAA-compliant features, including BAAs and PII redaction, to safeguard patient data.

Retell AI offers strong integration capabilities, particularly with major EHR systems (Epic, OpenDental, eClinicalWorks, etc.) via HL7, FHIR, and REST APIs for seamless data exchange. It also supports various telephony providers (Twilio, Telnyx, Vonage) and can integrate with calendar booking platforms (Cal.com) and automation tools (Keragon, n8n, GoHighLevel). While it provides flexibility for custom LLM integrations, direct, one-click CRM integrations may require manual wiring using tools like Make or Zapier.

Details

Category Medical Phone & Communication, Practice Management & Scheduling
Pricing Paid
  • Pay-as-you-go model; Voice engine rate: $0.07-$0.08/min; LLM costs: $0.003-$0.08/min (depending on model); Telephony: $0.015/min + $2/month per phone number (Retell-managed Twilio); Concurrent calls: 20 free, then $8/month per additional slot; Knowledge base fees: some free, then $8/month each plus usage fees; Verified phone numbers: up to $100/month; Enterprise plans available with custom pricing and SLAs
DeploymentCloud-based
Compliance
BAA Available Yes AI-estimated
HIPAA Compliant Yes AI-estimated
FDA Status Unknown AI-estimated — unknown
Integrations
EHR Not specified
Specialties Family Medicine, Internal Medicine, Pediatrics

What the Web Says

Retell AI is a platform for building, deploying, and monitoring AI voice agents that can handle phone calls, automate routine conversations, and perform tasks like scheduling and routing. It is generally praised for its natural-sounding voices, low latency, and ease of integration, making it suitable for various business applications, including healthcare. While it offers a powerful visual builder for developers, it is not a no-code solution and may require technical expertise for complex workflows.

Overall: Positive

Strengths

  • Natural-sounding, human-like voices with low latency (around 600-800ms).
  • Easy to set up and deploy AI voice agents, with an intuitive user interface and visual flow builder for developers.
  • Seamless integration with various tools like CRMs, calendars, and automation platforms.
  • Effective for automating tasks such as appointment scheduling, lead qualification, and customer support.
  • Handles interruptions and off-script conversations smoothly, maintaining conversational flow.
  • Offers robust monitoring with call transcripts, analytics, and compliance features.

Limitations

  • Not a no-code solution; requires technical knowledge for setup and complex workflows.
  • Advanced workflows and prompt tuning can require significant testing and experimentation.
  • Premium pricing, with costs varying based on chosen components (LLM, voice engine, telephony), which can be harder to forecast at scale.
  • Customer support responsiveness could be improved, with priority support often reserved for enterprise clients.
  • Limited native integrations and no native WhatsApp or omnichannel support for self-serve users.
  • HIPAA compliance requires a significant add-on for pay-as-you-go plans, and some users have reported vague answers regarding GDPR compliance.

Based on reviews from: G2, The CX Lead, Reddit, Orvera AI, Synthflow, Autocalls, Gartner Peer Insights, Sacesta Blog, Kolsetu Blog, Thoughtly, Capterra, Product Hunt

Last updated: 2026-08-06

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Press & Coverage

Retell AI Newsroom
Retell AI Joins Wing VC's 2026 Enterprise Tech 30 as Voice AI Demand Surges
Retell AI was selected for Wing VC's 2026 Enterprise Tech 30 list, recognizing it as a high-potential enterprise technology firm amidst increasing demand for voice AI. The company has also received G2 Best Software Awards in 2026, including for fastest-growing and agentic AI.
2026-05
Speech Technology
Retell AI Launches Conductor - Speech Technology
Retell AI launched Conductor, a graph-native review system and AI copilot for production voice agents, designed to help companies build, test, and continuously improve their AI voice agents. The no-code platform enables deployment of human-like AI voice agents in various sectors, including healthcare, and now handles over 55 million AI phone calls monthly.
2026-06
SiliconANGLE
Retell AI targets human bottlenecks in agentic voice AI with automated QA - SiliconANGLE
Retell AI introduced Retell Assure, a quality assurance solution for voice AI that monitors calls, identifies issues, and reduces the need for human spot checks. This aims to address quality gaps in voice AI by automatically tweaking models as needed.
2025-12
GlobeNewswire
Voice AI Startup Retell AI Launches Conductor, Featuring the First-Ever Graph-Native Review Interface for Production Voice Agents - GlobeNewswire
Retell AI announced the launch of Conductor, an AI copilot with a graph-native review system for production voice agents, aimed at helping enterprises identify failures, automate testing, and continuously improve voice agents at scale for contact centers. The platform processes over 55 million AI phone calls each month for customers like the San Antonio Spurs and Motorola.
2026-06
GlobeNewswire
Upgraded Retell AI Voice Platform Enables Corporate Call - GlobeNewswire
Retell AI has added new features to its platform, allowing corporate call centers to deploy human-standard AI sales and support agents across multiple channels, effectively replacing traditional IVR systems. The company has grown to power over 40 million real-time AI phone calls monthly.
2026-01
Retell AI Blog
AI for Healthcare: How AI Agents Help with Patient Screening - Retell AI
This article discusses the increasing integration of AI voice agents into healthcare systems to revolutionize patient interactions and administrative processes like patient screening. Retell AI offers solutions designed to minimize errors and improve patient interactions in healthcare.
unknown
Retell AI Website
Retell AI: AI Phone Agents for Healthcare
Retell AI provides HIPAA-compliant AI voice agents for healthcare to streamline patient calls, offering fast, context-rich, and personalized call transfer options. These agents can triage, route, and transfer calls in seconds, enhancing patient service and offloading tasks.
unknown
Retell AI Blog
The 2026 TCPA Compliance Playbook for Voice AI Outbound | Retell AI
This article outlines the TCPA compliance landscape for voice AI outbound calls in 2026, noting that AI-generated voices are considered 'artificial or prerecorded' under FCC rulings. It emphasizes the need for prior express written consent for marketing AI calls and discusses state-specific regulations.
2024-02

Videos

Product demos, reviews, and walkthroughs for Retell AI.

View all on YouTube

Frequently Asked Questions

Retell AI is an artificial intelligence platform designed to facilitate natural, real-time voice conversations. For a medical practice, it can be integrated into phone systems to handle routine inquiries, appointment scheduling, prescription refill requests, and provide general information to patients, freeing up staff for more complex tasks.
Retell AI, when used in a healthcare context, must be implemented with robust security measures and data handling protocols to ensure HIPAA compliance. This typically involves end-to-end encryption, secure data storage, strict access controls, and business associate agreements (BAAs) to protect patient health information (PHI). Practices should verify Retell AI's specific compliance certifications and features.
Alternatives to Retell AI include other AI-powered conversational platforms, dedicated medical answering services, and advanced interactive voice response (IVR) systems. AI platforms offer greater customization and natural language processing, while answering services provide human interaction. IVR systems are more basic but can handle high call volumes for simple tasks. Each has varying levels of cost, flexibility, and ability to handle complex patient needs.
The pricing structure for Retell AI can vary, often depending on factors such as call volume, features utilized (e.g., natural language processing, integrations), and the level of support required. Practices should expect tiered pricing models, potentially including per-minute charges, monthly subscriptions, or enterprise-level agreements. It's crucial to obtain a detailed quote tailored to the practice's specific needs.
While Retell AI excels at routine tasks, its limitations lie in handling highly complex medical queries, emotionally charged conversations, or urgent situations requiring immediate clinical judgment. Human intervention should always be prioritized for calls involving symptom assessment, medical advice, emergencies, or when a patient expresses distress or confusion that the AI cannot adequately address.
Integration capabilities with existing EHR systems are a critical consideration for medical practices. Retell AI may offer APIs or pre-built connectors to integrate with popular EHR platforms, allowing for seamless data exchange such as appointment scheduling, patient information retrieval, and updating patient records. Practices should confirm specific EHR compatibility with Retell AI.
The implementation timeline for Retell AI can vary based on the complexity of the integration and the specific needs of the practice, but typically ranges from a few weeks to a couple of months. Staff training would focus on understanding how to leverage the AI effectively, managing call transfers, accessing conversation logs, and troubleshooting minor issues.

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Suggest an Edit → | Last Verified: 2026-08-05 | First Added: 2026-08-05
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