Rime

Rime is a voice AI company that builds text-to-speech, speech-to-text and speech-to-speech models for enterprise voice agents on the phone. Instead of chasing audiobook narration or creator voiceovers, Rime tunes its models for live calls: fast first audio, consistent pronunciation of names and numbers, and support for 8 kHz phone audio. The company says it was founded by linguists, and that focus shows in its pronunciation controls.

What is Rime used for?

Rime supplies the voice layer for conversational agents that talk to customers, patients or guests.

• Speaking voices for customer service and booking agents built on LiveKit or Pipecat
• Speech-to-speech agents with Prism, which listens, reasons and replies in one model
• Checking every response as text before audio, so compliance disclosures and guardrails apply
• Real-time transcription of phone calls with Rime STT
• Shaping accent, pace and tone so a voice fits a brand or industry
• Running voice models in a private cloud or on-premises for regulated data

Who Rime is best for

Rime suits teams building production phone agents in healthcare, banking, hospitality and food ordering, where mispronounced names or slow replies lose customers. Enterprises that need a BAA, a SOC 2 report or self-hosted models are a natural fit. Content creators who want narration for videos will find consumer voice studios easier.

Rime pricing

As of October 2026, Rime's Free plan has no monthly fee and no card requirement, and includes $50 of usage every month across Prism, Mist v3, Coda v2 and Rime STT. The Flex plan is billed by the minute with no commitment: Prism speech-to-speech costs $0.080 per minute, Mist v3 $0.030, Coda v2 $0.050 and Rime STT $0.002 per minute, with STT listed as free until November 19. The Scale plan costs $100 per month, includes $100 of credit that rolls over up to $200, and takes 20 percent off every rate. Enterprise is invoiced annually with volume rates, VPC or on-prem deployment, fine-tuning, custom voices, a forward deployed engineer and linguist, and a HIPAA BAA.

Rime limitations

• There is no consumer studio for long-form narration or video voiceovers
• Fine-tuning on your own calls and custom voices require an enterprise contract
• Prism turn taking is half duplex at launch, according to the plan comparison
• Per-minute pricing for TTS is higher than some character-based rivals for long audio

Rime vs alternatives

Cartesia is the closest competitor, also focused on very low latency voices for agents. ElevenLabs offers a wider voice catalog plus creator tools, dubbing and its own agents platform. Deepgram combines speech recognition and voice output under one vendor, with strong English transcription. Resemble AI is aimed at enterprise cloning and deepfake detection. Choose Rime when pronunciation consistency, phone audio quality and on-premises options matter more than a large creator toolset.

Tips for getting started with Rime

Use the monthly $50 free usage to test your hardest phrases, such as account numbers, drug names and street addresses. Set pronunciation rules for brand terms before tuning tone. If you build with LiveKit or Pipecat, start from the existing integration instead of the raw WebSocket API, and try Prism only after you have a baseline with a cascaded setup.

Rime FAQ

Is Rime free?

Yes, Rime has a free plan that includes $50 of usage every month across its models, with no credit card required.

What is Rime used for?

Rime is used to give AI phone agents natural, fast voices, plus speech-to-text and a speech-to-speech model for live customer calls.

Can Rime run on-premises?

Yes. Rime's Enterprise plan supports VPC and on-premises deployment, along with a HIPAA BAA and a SOC 2 Type II report on request.

Rime vs Cartesia: which is better?

Both target low-latency voice agents. Rime leans on deterministic pronunciation and self-hosted options, while Cartesia is a strong pick for raw speed and voice quality.