Voice Freemium

Cartesia

Low-latency speech models and voice-agent infrastructure for real-time applications

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PricingFreemium
Starting price$5/mo
Free planYes
Free trialYes
APIYes
Open sourceNo
DeploymentCloud
Last verifiedAugust 3, 2026
Overview

Tool overview

Cartesia is listed under Voice AI tools.

Summary

What is Cartesia?

Cartesia provides streaming text-to-speech, speech-to-text, voice cloning, voice agents, APIs, SDKs, and production controls for responsive voice applications. Sonic 3.5 supports 42 languages and the Line product provides telephony-oriented agent infrastructure.

Best fit

Best for

Developers building responsive multilingual voice products

Audience

Who is it for?

Voice-agent developersProduct teamsContact-center teamsMedia applications
Recommendation

Decision note

Rebuilt from the original export under the complete V412/V411 factual-source-verification workflow. Preview only. Apply remains blocked until Failures = 0, Warnings = 0, Unmapped = 0, Missing = 0; explicit clears are reviewed; image import is disabled or V380 accepts the asset; a representative WordPress edit screen is compared with the export and proposed row; and a post-Apply zero-change Preview succeeds.

Capabilities

Key features

Streaming text-to-speech and speech-to-text

Sonic 3.5 support for 42 languages

Instant and professional voice cloning

Line voice agents with real-time streaming

Workflows

Use cases

Build conversational voice agents

Add speech to applications

Transcribe live or recorded audio

Create multilingual synthetic voices

Strengths

Pros

  • Free plan with monthly credits
  • Low-latency streaming APIs
  • Broad multilingual model support
Considerations

Cons

  • Credit and concurrency limits vary by plan
  • Voice cloning requires consent controls
  • Agent minutes add usage charges
Considerations

Limitations

Synthetic speech can mispronounce names, codes, or domain terms despite model improvements.

Deployments need consent, disclosure, privacy, recording-law, and fallback controls.

Cost

Pricing details

Pricing modelFreemium
Starting price$5/mo
Free planYes
Free trialYes
Pricing context

Billing options

Monthly subscriptionCreditsAgent minutesEnterprise custom
Pricing context

Pricing note

Free is $0 with 20,000 credits monthly. Pro is $5/month, Startup $49, and Scale $299. Line voice-agent calls are $0.06/minute across self-serve plans; Enterprise is custom.

View official pricing
Compatibility

Supported languages

  • English
  • French
  • German
  • Spanish
  • Portuguese
  • Chinese
  • Japanese
  • Hindi
  • Italian
  • Korean
  • Dutch
  • Polish
  • Russian
  • Swedish
  • Turkish
  • Tagalog
  • Bulgarian
  • Romanian
  • Arabic
  • Czech
  • Greek
  • Finnish
  • Croatian
  • Malay
  • Slovak
  • Danish
  • Tamil
  • Ukrainian
  • Hungarian
  • Norwegian
Connectivity

Integrations

Python SDK

TypeScript SDK

WebSocket

Telephony providers

LiveKit

Specs

Technical details

PlatformsWeb, API
Multilingual supportYes
Login requiredYes
Open sourceNo
DeploymentCloud
CompanyCartesia
Current versionsonic-3.5-2026-05-04
Models / versionsSonic 3.5 Ink-2 Line
Editions / plansFree, Basic, Professional, Organization, and Custom plans
Data confidenceHigh
Last verifiedAugust 3, 2026
Documentation → Release notes → Data source →
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Answers

Frequently asked questions

Cartesia provides streaming text-to-speech, speech-to-text, voice cloning, voice agents, APIs, SDKs, and production controls for responsive voice applications. Sonic 3.5 supports 42 languages and the Line product provides telephony-oriented agent infrastructure.
Developers building responsive multilingual voice products
The listed pricing model for Cartesia is Freemium. Pricing can change, so users should verify the latest plan details on the official website.
Yes. The current profile indicates that a free trial is available.
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