Retell AI

Retell AI is a third-generation AI voice agent platform that uses large language models and proprietary voice orchestration to deliver natural, human-quality phone conversations at scale. It enables businesses to build, deploy, and monitor AI call center agents with ~600ms latency, ultra-realistic voices, and real-time function calling. The platform supports omni-channel communication including voice calls, chat, and SMS, and is trusted by 3,000+ companies across healthcare, financial services, insurance, logistics, and more. Teams can launch in weeks with a drag-and-drop agentic framework and no platform fees—paying only for usage.

• Drag-and-Drop Agentic Framework: Design reliable conversational call flows with built-in guardrails and full control over agent behavior without writing complex code.
• Real-Time Function Calling: Add built-in or custom functions directly into call flows so agents can book appointments, process payments, update records, and transfer calls live.
• Streaming RAG & Knowledge Base: Ensure accurate, real-time answers backed by a knowledge base that auto-syncs with your latest website content.
• Batch Calling: Run outbound call campaigns at scale without concurrency limits, with detailed conversion tracking after each campaign.
• Post-Call Analysis & QA: Review past calls to surface failure patterns and actionable insights that continuously improve agent performance.
• Branded Call ID & Verified Numbers: Display your brand on outbound calls and use verified phone numbers to prevent spam labeling.
• SIP Trunking / Custom Telephony: Connect any existing phone number or VOIP provider via SIP trunking without changing infrastructure.
• Enterprise Security: HIPAA, SOC2 Type II, and GDPR compliant with SSO, PII redaction, custom role-based access control, and on-prem deployment options.
• Simulation Testing: Test agents across real-world scenarios before launch to validate behavior, accuracy, and reliability at scale.
• Performance Analytics Dashboard: Design custom charts to analyze call outcomes, agent performance, and business impact in one place.