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Rime AI

Conversational text-to-speech for phone voice agents

Raised to date

$22M

of $26.8M offered across 1 Form D filing

Still open
$4.7M
Investors
16
Last filed
Jun 11, 2026

About

Rime Labs is a San Francisco voice AI company that builds speech synthesis models for high-volume, real-time enterprise conversations. Its models are trained on a proprietary in-house-recorded dataset of spontaneous, full-duplex conversational speech including interruptions, laughter and disfluencies. Rime sells API access and on-premises deployments to companies running automated phone interactions, and reports powering over 1.5 million conversation minutes. It was founded in 2022 by Lily Clifford, Brooke Larson and Ares Geovanos.

Rime records its own spontaneous conversational speech data rather than training on read audiobook-style corpora, which it uses to deliver sub-100ms time-to-first-byte and deterministic pronunciation control for brand names and IDs - the failure modes that matter in production phone calls rather than in demos.

Funding

  • EquityFiled Jun 11, 2026Form D
    $22M/ $26.8M

Product

Mist v3

Text-to-speech API

Rime's conversational text-to-speech model, optimized for real-time dialogue in production voice agents and available via API or self-hosted deployment.

  • Consistently sub-100ms time-to-first-byte
  • 600+ voices with customizable accent, pace and tone
  • 50+ languages with regional dialects and code-switching

Built for

Enterprises and voice AI developers running high-volume automated phone interactions, notably food ordering, healthcare, financial services, hospitality and customer support

People on file