Retell AI (retellai.com) is an AI-powered voice and conversational agent platform built for teams that need to deploy intelligent phone and chat agents fast. With a simple API and no-code flow builder, Retell AI lets developers and businesses create lifelike voice agents that can handle inbound calls, outbound campaigns, scheduling, and customer support — without the overhead of traditional IVR systems.
How Retell AI Works
Retell AI connects your chosen LLM (GPT-4, Claude, Gemini, or a custom model) to a real-time voice pipeline with built-in speech recognition and text-to-speech. You define the agent's persona, conversation flow, and tools — then deploy it to a phone number or embed it in your app. The platform handles turn-taking, interruptions, and latency optimization automatically, so conversations feel natural rather than robotic.
Key Features
- Real-time voice agents — ultra-low latency pipeline handles natural back-and-forth conversation with interruption support
- Multi-LLM support — connect GPT-4o, Claude, Gemini, or your own fine-tuned model
- No-code flow builder — drag-and-drop conversation designer for non-technical teams
- AI Chat Agents — deploy text-based agents to web, SMS, or messaging channels alongside voice
- Custom phone number provisioning — buy or port numbers directly in the platform
- Analytics & call transcripts — full transcripts, sentiment analysis, and usage dashboards
Retell AI Pricing
Source: retellai.com/pricing, verified March 2026.
- Free — $10 in credits — Full platform access on signup, no commitment required. Ideal for testing and prototyping.
- AI Voice Agents — $0.07–$0.31/min — Pay-as-you-go based on the LLM and voice provider selected. No monthly minimum.
- AI Chat Agents — $0.002+/msg — Per-message billing for text-based agents. Volume discounts available.
Who Should Use Retell AI?
Retell AI is the right platform for developers and product teams building voice-first applications — from AI receptionists and appointment schedulers to outbound sales dialers and support bots. If your use case requires natural phone conversations at scale, Retell AI provides the real-time voice infrastructure that would otherwise take months to build in-house. Suitable for startups and enterprises alike given its usage-based pricing model.
