Retell AI

Retell AI is an AI voice agent platform for inbound and outbound call operations. Teams use it to build, deploy, test, and monitor agents that connect to business systems through functions, telephony, and APIs.

Key Highlights

• LLM-based voice agents for natural, multi-turn calls
• Turn-taking and voice orchestration with about 600 ms latency
• Drag-and-drop flows with guardrails, simulation testing, and QA
• Function calling, streaming RAG, SIP trunking, branded caller ID, verified numbers, analytics, webhooks, and API access

What Makes It Different

Retell AI is a production voice stack, not a generic chatbot builder. Its site contrasts it with IVR and IVA systems: instead of touch-tone menus or fixed intent maps, its 3rd Gen Voice AI uses LLMs for multi-turn conversations, edge cases, and outbound calls. The orchestration layer lets agents complete appointments, payments, transfers, or CRM updates during a call.

Features & Capabilities

Teams can start from templates or configure call flows inside Retell AI's agentic framework. Demo use cases include receptionist, appointment setter, lead qualification, customer service, debt collection, and survey agents. Before launch, teams can run simulations, then review calls through analytics, transcripts, dashboards, and QA.

Agents can use custom functions, pull answers from a knowledge base, and work across voice call, chat, SMS, and API channels. Listed integrations include HubSpot, Twilio, Salesforce, Zapier, Avaya, Genesys, Five9, Amazon Connect, Telnyx, Make, and Cal.com.

User Ratings and Testimonials

Retell AI does not publish a third-party average rating. It includes customer quotes from Pine Park Health, SWTCH, and Medical Data Systems, with reported results around scheduling NPS, EV support costs, inbound call handling, transfer rate, and monthly collections.

The main watchout is cost predictability. Per-minute cost changes by LLM, text-to-speech provider, telephony, add-ons, and concurrency, while custom SSO, custom MSA/DPA terms, and 24/7 dedicated portal support sit in the Enterprise Plan.

Pricing & Value

• Pay as you go: starts at $0 with $10 in free credits, then $0.07-$0.31/min for AI Voice Agents and $0.002+/message for AI Chat Agents. It includes platform access, templates, analytics, transcripts, simulation testing, webhooks, API access, 20 free concurrent calls, and email support.
• Enterprise Plan: custom pricing for AI Voice Agents and AI Chat Agents, with volume pricing, custom MSA/DPA terms, role-based access control, a dedicated stable server, custom SSO, higher concurrency, and 24/7 support with a dedicated portal.

Retell AI is strongest for teams that want usage-based voice automation with production telephony, testing, analytics, and enterprise options.