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Software · head to head

Cartesia vs Subframe

Cartesia logo

Cartesia

Software

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

From
Free
Rated
-
Full reviewWebsite
S

Subframe

Software

The AI-native design tool built for code

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Cartesia instant and professional voice cloning are gated behind paid Pro and Startup tiers, unavailable on the free plan.; Subframe the free plan is capped at 1 project, 10 pages, and 2 prototypes with limited AI usage and only 24 hour version history, versus unlimited AI on the $29 per editor per month Pro plan, as of August 2026.

Where they differ

Only the attributes on which Cartesia and Subframe actually diverge.

Attributes where Cartesia and Subframe differ
AttributeCartesiaSubframe
Platformsweb, apiWeb

Identical on both: starting price (Free), pricing model (freemium), free tier (Yes), user rating (Not yet rated), category (Unknown).

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 Subframe

Nothing recorded that Cartesia does not also cover.

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 Subframe
  • Real-time transcription for conversational applicationsnot Subframe
  • Voice cloning for branded synthetic voicesnot Subframe
  • On-device or on-premise voice AI for regulated industriesnot Subframe

Subframe

No use cases recorded yet. See the Subframe review.

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.

Subframe

  • The free plan is capped at 1 project, 10 pages, and 2 prototypes with limited AI usage and only 24 hour version history, versus unlimited AI on the $29 per editor per month Pro plan, as of August 2026.

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

Subframe

Free

No published plan breakdown. See the Subframe review.

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 Subframe if

  • You want to start without paying.
Subframe review

Questions people ask

Is Cartesia or Subframe better?
Neither clearly leads. Cartesia starts at Free and Subframe at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cartesia or Subframe?
Cartesia starts at Free and Subframe at Free.
Does Cartesia or Subframe run on more platforms?
Cartesia runs on web, api. Subframe runs on Web.
Can I use Cartesia for free?
Both have a free tier, so you can try either at no cost before committing.
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 Subframe is typically brought in for.
What can Cartesia do that Subframe cannot?
Cartesia covers Sonic text-to-speech, Ink speech-to-text, Line voice agent platform, Instant and professional voice cloning.

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
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
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
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