Cartesia
Real-time voice AI platform for speech and transcription with state space models.
Pricing
About Cartesia
Cartesia is an AI company building real-time voice and transcription models for interactive applications. The platform provides Sonic-3.5 (text-to-speech), Ink-2 (speech-to-text), and Line (voice agent builder) as core products. All models are built on State Space Models (SSMs), proprietary architectures designed for ultra-low latency, long-context reasoning, and efficiency at scale. The platform targets enterprises in finance, healthcare, and government sectors seeking voice agents that handle complex conversations with minimal latency. Cartesia distinguishes itself through ranked #1 performance on Speech Arena and Speech-to-Text leaderboards (per Artificial Analysis), and offers deployment flexibility across cloud, on-premise, and on-device environments. A key limitation is that as a specialized voice AI platform, its capabilities focus narrowly on speech and transcription rather than broader general-purpose AI tasks.
At a glance
- Company
- Cartesia (est. 2023)
- Platforms
- Web, API, Cloud, On-premise, On-device
- API
- Available
- Last verified
- June 2026
★Among the most viewed AI tools in Audio & Voice — ranked #10 of 195.
Who It's For
- •Enterprise organizations in finance, healthcare, and government
- •Companies building voice agents and interactive AI applications
- •Developers and engineers creating real-time voice experiences
- •Businesses requiring low-latency speech processing
- •Organizations with data residency and compliance requirements
How It Works
- 1Built on State Space Models (SSMs) - novel AI architectures delivering ultra-low latency and long-context reasoning
- 2Sonic generates natural, expressive speech in 40+ languages with laughter and emotion
- 3Ink provides streaming speech-to-text transcription with high accuracy for real-time interactions
- 4Line orchestrates voice agents that integrate with enterprise systems and handle complex conversations
- 5Models deployed via regional API endpoints ensure in-region processing and compliance
How to Use Cartesia
- 1Access models through REST API or robust SDKs for developers
- 2Deploy via cloud API endpoints, on-premise infrastructure, or on-device for different use cases
- 3Build voice agents using Line platform with customizable workflows
- 4Integrate with existing enterprise systems for voice-enabled applications
- 5Leverage pre-built voice agent templates or create custom agents from scratch
Key Features
- •Sonic-3.5: Real-time text-to-speech with natural, expressive voices
- •Ink-2: Streaming speech-to-text transcription model
- •Line: Customizable voice agent builder platform
- •Voice cloning and voice changing capabilities
- •Support for 40+ languages with laughter and emotion synthesis
- •Multi-deployment: cloud, on-premise, and on-device options
- •Enterprise-grade infrastructure with high availability
- •Voice enhancement and voice reader features
Use Cases
- •Customer service voice agents that improve experience and streamline operations
- •Financial services voice assistants for customer interactions and security enhancement
- •Healthcare voice applications for patient interactions and administrative tasks
- •Localization and multilingual voice content generation
- •AI voiceover and dubbing for content creation
Pros & Cons
Advantages
- •Ranked #1 on Speech Arena and Speech-to-Text leaderboards (Artificial Analysis), demonstrating industry-leading performance
- •State Space Models enable ultra-low latency and long-context reasoning, essential for real-time interactive applications
- •Flexible deployment options (cloud, on-premise, on-device) with in-region processing for compliance and data residency
- •Comprehensive full-stack solution combining models, voice agents, and developer tools in one platform
Disadvantages
- •Specialized focus on voice and speech means limited capability outside the voice AI domain compared to general-purpose AI platforms
- •Primarily enterprise-focused with higher barriers to entry for individual developers or smaller projects
- •Relatively newer entrant to market compared to established voice AI competitors
Alternatives
See all Cartesia alternatives →- Eleven Labs
- Play HT
- Murf AI
- Google Cloud Speech-to-Text and Text-to-Speech
- Amazon Polly and Amazon Connect
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Frequently Asked Questions
What is Cartesia?
Cartesia is an AI company building real-time voice and transcription models for interactive applications. The platform provides Sonic-3.
How much does Cartesia cost?
Cartesia is free to use.
Is Cartesia free?
Yes, Cartesia offers a free plan you can start with.
What are the best Cartesia alternatives?
Popular Cartesia alternatives include Eleven Labs, Play HT, Murf AI.
What is Cartesia used for?
Cartesia is commonly used for Customer service voice agents that improve experience and streamline operations, Financial services voice assistants for customer interactions and security enhancement, Healthcare voice applications for patient interactions and administrative tasks.
Does Cartesia have an API?
Yes, Cartesia offers an API for developers.
What platforms does Cartesia support?
Cartesia is available on Web, API, Cloud, On-premise, On-device.
Information Accuracy
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