Retell AI is a purpose-built voice agent infrastructure platform that enables developers and businesses to create AI agents handling inbound and outbound phone calls. It provides sub-600ms response latency, supports 31+ languages, and offers both a no-code drag-and-drop conversation flow builder and a code-based agent API. The platform handles the full lifecycle from testing to production monitoring. LLM, telephony, and TTS are modular components billed separately. Key features: - Sub-600ms response latency for natural phone conversations - Drag-and-drop Conversation Flow builder with IVR, dynamic transfers, and webhooks - Support for 31+ languages with native-quality speech - 20 free concurrent calls included on all accounts - Real-time monitoring, call transcripts, and analytics dashboard - Modular pricing: voice infra, LLM, TTS, and telephony billed independently
Pay-as-you-go from $0.07/min for voice infrastructure; realistic all-in cost $0.11-$0.31/min depending on LLM and TTS provider. $10 free credits to start. Enterprise pricing available via sales.