Cartesia

Ultra-fast, realistic text-to-speech API built for real-time voice agents.

Free + PaidAI Voice & Audioby Cartesia
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What is Cartesia?

Cartesia makes the Sonic text-to-speech models, designed for very low delay so voice assistants can respond naturally. Developers use its API to add speech to apps and agents. A web playground lets you try the voices.

Best for: Developers building real-time voice agents.

What you can do with Cartesia

  1. Give a customer service bot a natural voice

  2. Prototype a voice assistant

  3. Generate narration through an API

Key features

  • Low-latency speech generation
  • Voice cloning and design
  • Many languages
  • Streaming API

Cartesia pros and cons

Pros

  • Very fast responses
  • High voice quality

Cons

  • Mainly for developers

Cartesia pricing

Free + Paid

Cartesia has a free plan, with paid plans that add more usage or features. Plans change often, so check the official site for current prices.

How to get started

  1. Open cartesia.ai and create a free account.
  2. Try one real task first: give a customer service bot a natural voice.
  3. Compare the result with ElevenLabs or Whisper, then keep the one that fits how you work.

Compare Cartesia

Side-by-side comparisons of features, pricing, pros and cons.

Cartesia alternatives

Other tools that do a similar job, ranked by our editors.

  • ElevenLabs

    Free + PaidEditor's pick

    Lifelike text-to-speech, voice cloning and dubbing.

    AI Voice & AudioVisit

  • Whisper

    Open source

    OpenAI's open-source speech recognition model.

    AI Voice & AudioVisit

  • AssemblyAI

    Free + Paid

    Speech AI APIs that transcribe audio and pull insights from conversations.

    AI Voice & AudioVisit

  • Deepgram

    Free + Paid

    Speech-to-text and voice AI APIs for transcription and voice agents.

    AI Voice & AudioVisit

  • PlayHT

    Free + Paid

    Text-to-speech voices and an API for apps and content.

    AI Voice & AudioVisit

  • Resemble AI

    Paid

    Custom AI voices with consent checks, plus tools to detect synthetic speech.

    AI Voice & AudioVisit

Top AI voice tools

How Cartesia compares with the best in AI Voice & Audio.

  1. 1. ElevenLabs

    Free + Paid

    Lifelike text-to-speech, voice cloning and dubbing.

  2. 2. Murf AI

    Free + Paid

    Studio-quality voiceovers for videos, ads and e-learning.

  3. 3. Speechify

    Free + Paid

    Listen to any text, PDF or web page read aloud.

  4. 4. Adobe Podcast

    Free + Paid

    Make any recording sound like it was made in a studio.

  5. 5. Krisp

    Free + Paid

    Remove background noise from calls in real time.

See all 20 AI voice tools

Cartesia FAQ

What is Cartesia?

Cartesia makes the Sonic text-to-speech models, designed for very low delay so voice assistants can respond naturally. Developers use its API to add speech to apps and agents. A web playground lets you try the voices.

Is Cartesia free?

Cartesia has a free plan, with paid plans that add more usage or features. Check the official site for current limits and prices.

What can you do with Cartesia?

With Cartesia you can give a customer service bot a natural voice; prototype a voice assistant; generate narration through an API.

Who is Cartesia best for?

Developers building real-time voice agents.

Does Cartesia have an app?

Cartesia runs as web app and api; we know of no dedicated phone or desktop app.

Who makes Cartesia?

Cartesia is made by Cartesia.

What are the best alternatives to Cartesia?

Popular alternatives include ElevenLabs, Whisper, AssemblyAI and Deepgram. See the full ranking on our AI Voice & Audio page.

AltFTool is not affiliated with Cartesia. This summary was written by our editors from the tool's public information. Browse all 451 AI tools