Cartesia

Cartesia is a voice AI platform for real-time text-to-speech, speech-to-text, and voice agents with low latency and flexible deployment options.

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Overview

Cartesia is a voice AI platform focused on real-time speech generation, transcription, and voice agents. Its main products are Sonic for text-to-speech, Ink for speech-to-text, and Line for building voice agents.

The company positions these models for live, synchronous interactions where latency matters, including AI agents, customer support, sales, recruiting, and other conversational workflows. The site also says the same stack can be deployed in the cloud, on-premise, in a VPC, or on-device.

Core capabilities

Streaming text-to-speech

Generate real-time speech with Sonic-3.5, the company’s streaming TTS model, designed for low-latency conversational use instead of delayed batch rendering.

Voice control tools

Create or clone voices, localize audio into multiple languages, and use custom pronunciation dictionaries for names and domain terms that need precise delivery.

Streaming speech-to-text

Transcribe speech with Ink-2, the speech-to-text model positioned alongside Sonic for interactive voice systems and live conversation flows.

Voice agent platform

Build voice agents with Line using tools, guardrails, a customizable LLM, and built-in evaluations for testing live behavior and call analytics.

Flexible deployment options

Deploy the same models and agents across cloud, on-premise, VPC, and on-device environments to match latency, residency, and control requirements.

Developer-first workflow

Use API access together with SDKs and developer tools to move from copy-paste examples into production systems with iterative development loops.

Common use cases

Real-time assistant voice
Use Sonic to generate natural-sounding agent responses in live conversations where timing and pacing affect the interaction.
Production voice agents
Use Line to build a voice agent that can take actions, use tools, and be tested with built-in evaluations before deployment.
Multilingual voice experiences
Use Sonic’s localization and voice cloning features to keep a consistent brand voice across languages and markets.
Live speech transcription
Use Ink to transcribe spoken input for call flows, live support workflows, or other systems that need fast speech recognition.
Controlled deployment environments
Use the platform’s deployment options to run in cloud, on-premise, VPC, or on-device settings when residency or control matters.

Pros and Cons

Pros

Combines text-to-speech, speech-to-text, and voice agents in one platform.
Supports low-latency, live conversation use cases rather than only batch generation.
Offers deployment choices across cloud, on-premise, VPC, and on-device environments.
Includes built-in evaluations and analytics for voice-agent testing and monitoring.
Has self-serve pricing alongside an enterprise contact-sales path.

Cons

The public site does not provide a full integrations catalog or detailed SDK language list in the collected material.
Some FAQ-style questions on the pricing page are listed, but the rendered source does not include all of the answers.
Plan pricing is usage-based, so total cost depends on credits, agent minutes, and selected products.

FAQ

Does Cartesia offer self-serve and enterprise plans?

Yes. The pricing page shows Free, Pro, Startup, Scale, and Enterprise options, with a contact-sales flow for Enterprise. It also presents usage-based credits and agent minutes, so teams can start small and move up as usage grows.

What products are included in the Cartesia platform?

Cartesia’s site presents Sonic for text-to-speech, Ink for speech-to-text, and Line for voice agents. The home and agents pages indicate these are exposed through APIs and developer tooling, with Line aimed at building and deploying production voice agents.

Can Cartesia be deployed outside of the cloud?

The site says Cartesia supports cloud deployment, regional API endpoints, on-premise or VPC deployment, and on-device deployment. It also says the same models and agents can run across these environments.

How is usage and team access handled?

The pricing page says plans include unlimited workspace seats and voice slots on every plan, while usage is metered through credits and agent minutes. The site also references built-in evaluations and agent analytics for voice agents.

What integrations does Cartesia list publicly?

The source materials do not provide a public setup wizard or a full integration list. They do show API access, SDKs, and developer tools, but not a complete catalog of supported languages or third-party integrations.

Quick Facts

Category: Voice AI platform
Products: Sonic, Ink, Line
Primary use: Real-time speech generation, transcription, and voice agents
Deployment: Cloud, on-premise, VPC, on-device
Pricing: Free, Pro, Startup, Scale, Enterprise
Source domain: cartesia.ai