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AI · head to head

Cartesia vs Copy.ai

Cartesia logo

Cartesia

AI

Real-time voice AI platform for speech generation, transcription, and voice agents

From
Free
Rated
-
Full reviewWebsite
Copy.ai logo

Copy.ai

AI

AI-powered copywriting made easy

From
$29/month
Rated
-
Full reviewWebsite

The short version

  • Only Cartesia has a free tier, so it costs nothing to try first.
  • Each has a real cost: Cartesia instant and professional voice cloning are gated behind paid Pro and Startup tiers, unavailable on the free plan.; Copy.ai chat plan (lowest tier) available monthly, but Growth/Expansion/Scale plans require annual billing with no monthly option
  • They diverge on capability: Cartesia covers Sonic text-to-speech, Copy.ai covers AI copywriting.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Cartesia and Copy.ai actually diverge.

Attributes where Cartesia and Copy.ai differ
AttributeCartesiaCopy.ai
Starting priceFree$29/month
Pricing modelfreemiumusage-based
Free tierYesNo
Platformsweb, apiWeb
FoundedUnknown2020

Identical on both: user rating (Not yet rated), category (AI).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Cartesia

  • Sonic text-to-speech
  • Ink speech-to-text
  • Line voice agent platform
  • Instant and professional voice cloning
  • Flexible deployment
  • Telephony integration

Only in Copy.ai

  • AI copywriting
  • 90+ templates
  • Multi-language
  • Bulk generation
  • Zapier
  • API access
  • Web support
  • Api support

What people use each for

The jobs each tool is most often brought in to do.

Cartesia

  • Building low-latency voice agents for customer supportnot Copy.ai
  • Real-time transcription for conversational applicationsnot Copy.ai
  • Voice cloning for branded synthetic voicesnot Copy.ai
  • On-device or on-premise voice AI for regulated industriesnot Copy.ai

Copy.ai

  • AI-powered copywriting and content generation for marketing and salesnot Cartesia
  • Go-to-market automation with AI workflows and copy agentsnot Cartesia

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Cartesia

  • Instant and professional voice cloning are gated behind paid Pro and Startup tiers, unavailable on the free plan.
  • Voice agent calls carry a separate per-minute usage fee ($0.06/minute) on top of subscription credits.
  • Enterprise features like SSO and BAAs require a custom sales conversation rather than self-serve upgrade.
  • Free tier concurrency limits (2 TTS, 8 STT concurrent requests) may be restrictive for testing production-like load.

Copy.ai

  • Chat plan (lowest tier) available monthly, but Growth/Expansion/Scale plans require annual billing with no monthly option
  • Workflow credits system complexity requires calculating credit consumption based on workflow complexity; rates not published

Pricing, plan by plan

Cartesia

Free
  • FreeFree
    • 20,000 credits/month
    • TTS and STT included
    • 2 concurrent TTS requests, 8 concurrent STT requests
  • Pro$4/month
    • 100,000 credits/month
    • Commercial use license
    • Instant voice cloning
  • Startup$39/month
    • 1.25M credits/month
    • Professional voice cloning
    • Organizations support
  • Scale$239/month
    • 8M credits/month
    • Priority support
    • High concurrency limits

Copy.ai

$29/month
  • Chat$29/month
    • 5 seats
    • Unlimited words in chat
    • Unlimited chat projects
  • Growth$1000/month
    • 75 seats
    • Unlimited words in chat
    • 20,000 workflow credits per month
  • Expansion$2000/month
    • 150 seats
    • Unlimited words in chat
    • 45,000 workflow credits per month
  • Scale$3000/month
    • 200 seats
    • Unlimited words in chat
    • 75,000 workflow credits per month

Which should you pick?

Choose Cartesia if

  • You need sonic text-to-speech.
  • You want to start without paying.
  • You work on web, api.
  • You also want ink speech-to-text.
Cartesia review

Choose Copy.ai if

  • You need ai copywriting.
  • You also want 90+ templates.
Copy.ai review

Questions people ask

Is Cartesia or Copy.ai better?
Neither clearly leads. Cartesia starts at Free and Copy.ai at $29/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cartesia or Copy.ai?
Cartesia has a free tier; the other does not. Paid plans start at Free for Cartesia and $29/month for Copy.ai.
Does Cartesia or Copy.ai run on more platforms?
Cartesia runs on web, api. Copy.ai runs on Web.
Can I use Cartesia for free?
Yes. Cartesia has a free tier, so you can try it without paying. Copy.ai starts at $29/month.
What is Cartesia best used for?
Cartesia is most often used for building low-latency voice agents for customer support, real-time transcription for conversational applications, voice cloning for branded synthetic voices, on-device or on-premise voice ai for regulated industries. Of those, building low-latency voice agents for customer support and real-time transcription for conversational applications are not what Copy.ai is typically brought in for.
What can Cartesia do that Copy.ai cannot?
Cartesia covers Sonic text-to-speech, Ink speech-to-text, Line voice agent platform, Instant and professional voice cloning. Copy.ai covers AI copywriting, 90+ templates, Multi-language, Bulk generation.

Answered from the vendors’ own pages

Cartesia: What does Cartesia cost?

Cartesia offers a free plan, Pro at $4/month, Startup at $39/month, Scale at $239/month, and custom Enterprise pricing, each including a monthly credit allotment, with annual billing saving 20%.

Source
Copy.ai: How much does Copy.ai cost?

Copy.ai offers a Chat plan starting at $29/month with 5 seats and unlimited chat words. Growth ($1,000/month), Expansion ($2,000/month), and Scale ($3,000/month) plans require annual billing and include workflow credits. Enterprise custom pricing is available.

Source
Cartesia: Is there a free plan, and what are its limits?

The Free plan includes 20,000 credits per month, both TTS (Sonic) and STT (Ink), 2 concurrent TTS requests, 8 concurrent STT requests, and 1 voice agent slot.

Source
Copy.ai: What is included in Copy.ai's Chat plan?

The Chat plan at $29/month ($24/month annual) includes 5 seats, unlimited words in chat, unlimited chat projects, and access to OpenAI, Anthropic, and Gemini language models.

Source
Cartesia: How is usage metered?

Usage draws down a monthly credit allotment, with voice agent calls additionally billed at $0.06/minute and telephony via Cartesia phone numbers at $0.014/minute.

Source
Copy.ai: How do Copy.ai workflow credits work?

Copy.ai uses a credit-based system where workflow complexity determines credit consumption. Growth plan includes 20,000 credits/month, Expansion includes 45,000 credits/month, and Scale includes 75,000 credits/month. Additional credits can be purchased as organizational needs expand.

Source
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