Rime is a San Francisco voice AI company focused on a specific, commercially important quality: making AI voices sound authentically human in real business conversations. Many text-to-speech systems optimize for a smooth, broadcast-style voice, but Rime's bet is that for customer-facing calls — ordering food, booking service, handling support — voices that sound like real, relatable people perform better, building trust and keeping callers engaged rather than tipping them off that they are talking to a machine.
The company was founded in 2022 by Lily Clifford, who left a computational linguistics PhD at Stanford, together with Brooke Larson, a PhD linguist and former Amazon Alexa researcher, and Ares Geovanos, a Stanford engineer. That linguistics-heavy team built models tuned for naturalness, expressiveness, and the subtle cadences of everyday speech, with an emphasis on the reliability and low latency that enterprise voice deployments require.
Rime's traction is notable: its technology is used in more than 100 million phone conversations every month across more than 20 large enterprise customers, including consumer brands like Domino's and Wingstop. That kind of volume reflects a focus on the operational realities of enterprise voice — consistency across millions of calls, fast response, and voices customers actually respond to.
In May 2025 Rime announced a $5.5M seed round led by Unusual Ventures, with participation from Founders You Should Know, Cadenza, and a large group of angel investors. The funding supports Rime's mission to deliver trusted, hyper-realistic voice AI for business applications, deepening its model research and expanding its enterprise footprint as conversational voice moves into everyday commerce.