Retell AI is a platform that enables developers to build advanced, human-like conversational voice AI quickly, with an impressive response time of around 800ms.

Founded in 2023 and backed by Y Combinator, Retell AI offers APIs for creating voice agents capable of handling complex tasks and interruptions. The company aims to revolutionize customer service with its stateful multi-prompt framework.

From 0 to $3M in revenue in the 6 months since launching with no sales or marketing.