Retell AI

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Retell AI is a platform for building and running AI voice agents that handle business phone calls, built to be AI-native rather than a layer bolted onto legacy call-center scripting. Founded in 2024, it lets companies replace traditional interactive voice menus with agents that answer and place calls, sound human, respond with low latency, and carry on natural, multi-turn conversations across voice, and also chat, SMS, and email. The platform is designed for fast, largely no-code setup. Teams build agents in a visual drag-and-drop flow builder, defining conversation paths, branching, and transfer logic, while the underlying language model handles the conversational reasoning, so a high-level goal and a few conditions replace pages of brittle scripting. A proprietary turn-taking model judges when the caller has finished speaking so the agent can respond without awkward pauses, and agents can perform warm transfers or escalate to a human when needed. Retell handles the telephony as well as the conversation. It connects to existing phone numbers and carriers through SIP trunking or providers like Twilio, supports branded and verified caller ID to reduce spam labeling, and runs outbound batch campaigns. Agents can call tools, fire webhooks, and pull from connected CRMs, knowledge bases, and other systems, including custom Model Context Protocol servers, and they operate in more than thirty languages with automatic detection of the caller's language. Because quality matters at call-center scale, the platform includes built-in testing to simulate conversations and A/B test flows, dashboards tracking outcomes, latency, sentiment, and customer satisfaction, and an automated quality-assurance capability that monitors live calls and flags improvements without manual spot-checking. It meets enterprise requirements with SOC 2, HIPAA, and GDPR compliance and single sign-on. Retell is used for inbound support, appointment scheduling and confirmations, lead qualification, outbound sales follow-ups, and survey calls, across industries like healthcare, financial services, and logistics. Its pitch is speed and simplicity: get production-ready voice agents live in days, automate the bulk of routine tier-one calls, and free human agents for the complex or sensitive ones, all on usage-based pricing.