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Cartesia

Cartesia provides speech AI models and developer infrastructure for applications that need to listen, speak or hold real-time voice conversations. Its main products include Sonic text-to-speech, Ink speech-to-text and Managed Agents for conversational applications.

The platform is aimed primarily at developers and product teams rather than people who only need an occasional voiceover. It provides APIs and SDKs for incorporating generated speech, transcription and conversational functionality into software.

Cartesia offers a free entry tier, but commercial usage and some voice-cloning capabilities require a paid subscription. Its pricing structure also separates speech-model credits from the dollar balance used for Managed Agents.

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Researched from Cartesia's official pricing, product and developer documentation on 5 November 2026. Promotional rates and vendor-reported technical capabilities require rechecking over time.

Best For

  • Developers building real-time voice-enabled applications.
  • Product teams needing both speech recognition and generated speech.
  • Organisations prototyping automated voice conversations with API integrations.

Not Ideal For

  • Non-technical users seeking a simple finished voiceover editor.
  • Developers planning commercial deployment using only the non-commercial Free tier.
  • Buyers who need one flat, all-inclusive price covering every model and telephone charge.

How It Works

An application sends text to Cartesia's Sonic speech service or sends audio to its Ink transcription service. The output can then be used in a voice interface, transcription workflow or other application.

Developers can combine these services with their own application logic. Cartesia's Managed Agents provide an alternative managed workflow that combines speech handling, conversational orchestration, chosen language models and integrations.

Costs depend on which service is used. Speech models consume credits, while Managed Agents are charged using a separate per-minute structure. Additional telephone and language-model usage charges may apply.

Key Features

Speech generation

  • Sonic text-to-speech models and streaming audio output
  • Supported voice controls and eligible voice-cloning features

Speech recognition

  • Ink streaming speech-to-text
  • Conversational turn detection for voice applications

Managed voice agents and APIs

  • Developer SDKs, conversational agents and tool integrations
  • Telephony options and enterprise deployment controls

Practical Workflows

  1. Voice-enabled application: Connect Sonic text-to-speech to an application so users can hear spoken responses instead of reading text.
  2. Conversation transcription: Process incoming audio using Ink, capture recognised speech and pass it to an application's workflow logic.
  3. Customer service voice agent: Configure a Managed Agent to answer approved questions, retrieve information from connected systems and transfer unresolved matters to a person.

Strengths & Limitations

Strengths

  • Provides both speech generation and speech recognition.
  • Supports low-latency streaming use cases.
  • Includes developer APIs and SDKs.
  • Offers a low-cost commercial entry tier for eligible applications.

Limitations

  • Developer integration is required for many use cases.
  • Free-tier usage does not include general commercial deployment rights.
  • Model credits and agent spending use different billing systems.
  • Voice-cloning and enterprise retention controls have plan-specific restrictions.

Pricing

Cartesia's Free plan costs $0/month and includes 20,000 monthly model credits and a $1 Managed Agents spending allowance, but the Free tier is designated for non-commercial use.

Pro costs $5/month with 100,000 model credits and a $5 agent allowance, adding commercial-use rights and Instant Voice Cloning. Startup costs $49/month with 1.25 million model credits and professional voice-cloning allowances. Scale costs $299/month with 8 million model credits and higher capacity. Enterprise pricing is negotiated.

Speech-model credits and Managed Agents dollars must be considered separately. Sonic text-to-speech generally uses about one model credit per character, while Ink 2 streaming recognition uses three credits per second of audio.

As of 5 November 2026, Cartesia advertises a promotional Managed Agents rate of $0.03 per minute through 31 December 2026, reduced from $0.06 per minute. A Cartesia-provided telephone number adds a published $0.014 per minute, and language-model usage is billed separately. Buyers should check the rate applicable after the promotion ends.

Enterprise options include additional security and data-handling controls. Zero Data Retention is described for eligible speech API inference, not stored voice-cloning assets.

How It Compares

Choose Cartesia when developing applications that need streaming speech generation, transcription or programmable voice interaction.

Consider ElevenLabs when evaluating a wider creative voice and audio production workflow. Consider Deepgram when speech recognition and voice API integration are key priorities. Consider Bland AI when an integrated business telephone-agent platform is more useful than modular speech APIs.

Cartesia is most relevant to teams comfortable building and maintaining voice-powered software.

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