What is Cartesia?
Cartesia is an AI voice platform built for real-time text to speech, transcription, and voice agent deployment. It generates speech at sub-90ms latency without sacrificing natural delivery. Its speech-to-text model captures structured data like phone numbers and dates during live calls. The voice agent SDK supports building agents that place and receive calls with turn detection and parallel task support. Cartesia is built for customer support, sales, recruiting, and fraud detection call workflows. Voice cloning and AI dubbing cover localization across 42 languages.
Cartesia Video
Features & Benefits
- Real-Time Text to Speech: Convert text to natural AI voice output at sub-90ms latency through Sonic.
- Streaming Speech-to-Text: Transcribe spoken audio in real time with the lowest word error rate of any streaming model, including accurate capture of phone numbers, dates, emails, and order IDs.
- Voice Agent Builder: Build and deploy AI voice platform agents with parallel background tasks, real-time system actions, and a customizable LLM.
- Voice Cloning: Clone any voice from as little as 3 seconds of audio, preserving accent, style, and emotional depth across a standard and professional tier.
- Automatic Emotional Delivery: Interpret the emotional context of a transcript and calibrate tone, pacing, and delivery without manual tuning.
- Non-Verbal Expression Support: Insert laughter and other non-verbal cues directly into transcripts for more lifelike AI voice output.
- AI Dubbing and Multilingual Localization: Dub video content into 42 languages with fine-grained control over pitch, speed, emotion, and speaker identity.
- Voice Changer: Convert an uploaded audio clip to a different target voice with background noise removal.
- Semantic Endpointing: Detect when a speaker has finished based on meaning rather than silence, so pauses mid-thought don’t cut off the caller.
- Native Turn Detection: Signal conversation turn starts and ends directly from the model with no external voice activity detector required.
- Early LLM Handoff: Pass the transcript to the LLM before the turn is confirmed complete, cutting response latency further.
- Custom Pronunciation Dictionaries: Define exact pronunciations for domain terms, proper nouns, medical terms, and alphanumeric strings.
- Built-In Agent Evaluations: Run live tests, track system metrics, and pull custom call analytics within the agent framework.
- Flexible Deployment: Run models via cloud, on-premise, or on-device depending on latency, compliance, or data residency needs.
What can Cartesia do?
- Generate speech from text with AI
- Clone a voice from audio
- Transcribe phone calls in real time
- Build an AI voice agent
- Dub video into other languages
- Add emotion to AI speech
- Automate outbound sales calls
- Screen job applicants by phone
- Remove background noise from audio
- Transcribe phone numbers from calls
- Localize audio into multiple languages
- Convert text to speech in real time
Real-World Applications
When a credit card transaction gets flagged, someone has to call the cardholder. Cartesia can run that call with a voice agent that confirms the charge details and closes the case. No hold queue, no staffing a night shift just to catch fraud early.
Clinics and medical offices deal with patients who pause mid-sentence, speak slowly, or lose their train of thought. The AI voice platform picks up on meaning rather than silence, so an appointment reminder call doesn’t cut someone off just because they stopped talking for a few seconds.
A documentary series going into ten languages usually means hiring ten narrators. Voice cloning changes that math. Three seconds of the original narrator’s audio is enough to carry their voice, emotion, and pacing into every dubbed version. The text to speech engine keeps the tone consistent across all 42 supported languages.
Technicians on warehouse floors and delivery drivers calling in from the road don’t get to work in quiet rooms. Cartesia strips out background noise and still picks up serial numbers, order IDs, and phone numbers accurately, even over rough telephony audio on the AI voice platform.
Game developers who need a cast of expressive characters can skip studio sessions entirely. Laughter, emotional shifts, and pacing are all adjustable per AI voice. Sales and recruiting teams can take a similar approach with outbound agents, running qualification calls and applicant screens at any hour and logging results before a person ever picks up the thread.
