Rime
Conversational text-to-speech built for real-time voice agents
About Rime
Rime Labs makes text-to-speech models for live conversation. Mist v3 targets the lowest latency (37 ms P50 time to first audio at single concurrency, per Rime's own benchmark) and Coda targets the most natural expression. Both stream over HTTP and WebSockets, support custom voice cloning, and can be self-hosted on-prem or in a VPC on the Enterprise plan. Pricing is usage-based from $0.03 per 1,000 characters.
Pros & Cons
Pros
- Mist v3 publishes some of the lowest time-to-first-audio numbers in the market
- Simple per-character pricing with 20 concurrent generations on the self-serve plan
- Self-hosting option keeps latency predictable and audio data in your own environment
- Deterministic pronunciation is useful for invented names and fantasy terms
Cons
- Voices and tuning are aimed at customer-service calls, not acted character performances
- Mist v3 covers only four languages
- Self-hosting and unlimited cloning require an Enterprise contract
Key Features
Mist v3
Lowest-latency model: 37 ms P50 and 56 ms P90 time to first audio at single concurrency per Rime, about 70 ms self-hosted; English, French, German, Spanish.
Coda
Most expressive model with 96 ms P50 time to first audio, word-level timestamps, and eight production languages.
Streaming over HTTP and WebSockets
Audio streams as it is generated for live dialogue.
Pronunciation control
Deterministic pronunciation for names, alphanumerics, and brand terms, plus spell mode and custom pauses.
Custom voice cloning
Custom voices on both models; unlimited custom clones on Enterprise.
Self-hosting
Deploy via Docker Compose or Kubernetes in your cloud, VPC, or on-prem (Enterprise).
Framework integrations
Works with LiveKit, Pipecat, and Twilio voice-agent stacks.
Pricing
- Free starting minutes, no credit card
- Mist v3 $0.03/1K chars, Coda $0.05/1K chars
- 20 concurrent TTS generations
- Public Slack support
- Volume pricing
- Unlimited concurrent generations
- Unlimited custom voice clones
- SLAs and dedicated support
- Cloud, on-prem, or VPC
- BAA and SOC 2 reports
Best For
Contact-center voice agents
Natural, fast voices for healthcare, finance, and hospitality phone agents.
Latency-critical interactive voice
Responsive spoken output where every millisecond of turn delay matters.
Regulated deployments
On-prem or VPC TTS with HIPAA BAA and SOC 2 Type II.
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