Rime Lands $24M in funding led by M13 to Expand Enterprise Voice AI Platform

The round also saw participation from Twilio Ventures, Corazon Capital, and continued participation from Unusual Ventures and other existing investors.

The company will use the funding to expand its proprietary conversational dataset, strengthen its engineering and research teams, and continue scaling its platform and infrastructure.

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Rime is focused on improving voice AI because computers still struggle to have natural conversations. While many companies focus only on making voices sound more realistic, Rime takes a different approach by using linguistics and speech science to make conversations feel more human.

Today, Rime powers nearly 100 million phone calls every month for companies such as Mayo Clinic, Dialpad, Upstart, and Asurion. By focusing on voice modeling and its expertise in linguistics, the company has built a strong presence in healthcare and financial services. Its technology is especially valuable in these industries because it delivers accurate pronunciation of complex medical and financial terms while meeting strict compliance requirements, including HIPAA.

"The design patterns that will define the speech-to-speech era of AI haven't been built yet. Rime is doing the foundational work by combining frontier AI with deep linguistic expertise to create the speech infrastructure the next generation of AI products will rely on,” said Morgan Blumberg, Partner at M13.

"The things that matter most in conversation are the hardest to pin down. Response relevance is hard to specify; speech appropriateness is hard to verify. There's no unit test for sounding like you care," said Lily Clifford, co-founder, and CEO of Rime. "That's exactly why this is a design problem not just an engineering one. We're building voice interaction models, systems where our linguistic judgment and taste become research instruments not afterthoughts.

About Rime 

Founded in 2022 by Lily Clifford along with academic speech scientists and Stanford engineers, Rime develops enterprise voice AI technology. Today, its platform powers more than 100 million interactions every month for organizations in healthcare, finance and customer service. Built on a linguistics-first approach, Rime provides conversational speech models that help businesses deliver more natural, accurate and reliable AI voice experiences.

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