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AI Voice & Speech Comparison

Cartesia vs. Rev

At a glance

At a glance

Cartesia

Best for

Best for developers building low-latency, real-time voice agents.

  • Small and mid-sized
  • Enterprise

Rev

Best for

Best for teams who need a transcript accurate enough to be relied on in court or in the record, with a human pass available on top of the machine one.

  • Freelancers
  • Small and mid-sized
  • Enterprise

Cataleo does not name a winner. Both statements come from the vendors themselves.

Full Comparison

Criterion Cartesia Rev
Starting price lower value Free tier; Pro from $5 / month Usage-based credits and agent minutes. Pro adds a commercial-use license and instant voice cloning. Free tier, then from $25.49 / seat / month The $25.49 Essentials rate is billed annually at $305.90 a year; paid monthly it is $29.99. Pro is $47.99 billed annually or $59.99 monthly. Human services are bought separately by the minute or page and are pooled across seats at account level. The Rev AI developer platform is billed per hour of audio instead, from $0.10 an hour on Reverb Turbo.
Free trial Free tier with 20,000 credits per month Free plan with 45 AI transcription and caption minutes a month, plus free Rev AI credits worth 5 hours of Reverb transcription
Commercial use Paid Not stated
Output Low-latency real-time speech, instant clone from around three seconds Transcripts, captions, subtitles and case documents
API Yes Yes, Rev AI for asynchronous and streaming speech-to-text, plus a human transcription API
Hosting Not stated Cloud or on-premises for the Rev AI platform
Voice cloning Yes, instant cloning from around three seconds, plus a Pro clone trained on 30 minutes or more of audio No, Rev works only on incoming speech and does not synthesise or clone voices
Real-time use Yes, real-time text-to-speech (Sonic), built for live voice agents Yes, a streaming speech-to-text API for live audio alongside asynchronous transcription of recorded files; human services are turnaround-based rather than real-time
Languages Yes, Sonic 3.6 covers 44 languages natively, chosen per request with a language parameter and regional locale variants 57+ languages for speech-to-text through Rev AI, 37+ on the Pro subscription and English only on the free plan; human captions cover English and Spanish, and human subtitles 17 languages
Speech-to-speech and dubbing Yes, a voice changer, plus localization that converts existing audio across the 44 supported languages while holding the speaker's emotion and identity No dubbing or synthesised speech. Translation is text-only, at $0.002 to $0.025 per minute through the API depending on standard or premium, plus human subtitles at $6.49 to $15.99 a minute
Editing and controls Speed 0.6x to 1.5x, volume 0.5x to 2x, an emotion setting (neutral, calm, angry, content, sad) or model-interpreted emotion, custom pronunciation dictionaries, accent selection for multilingual voices and text normalization Transcript editor with clipping, multi-file evidence analysis with citations, image analysis, a document editor exporting to Word and PDF, AI templates for chronologies and affidavits, and API-side custom vocabulary, forced alignment with word-level timestamps, topic extraction and sentiment analysis
Consent and trust The terms of service forbid publishing audio of another person's voice without that person's express permission, and name deceased people and political candidates explicitly SOC 2, HIPAA, GDPR and PCI compliant with data encrypted at rest and in transit, a stated 99.99% uptime, and on-premises deployment for the API; the Unlimited subscription adds HIPAA and CJIS compliance, SSO and a dedicated specialist
Deployment Cloud (SaaS), Browser-based more entries Cloud (SaaS), Browser-based, On-premise
Onboarding Documentation and knowledge base Documentation and knowledge base
Company size Small and mid-sized, Enterprise more entries Freelancers, Small and mid-sized, Enterprise
Integrations Not stated Clio

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Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.

The short version

Key Differences

  • Starting price Cartesia Free tier; Pro from $5 / month Rev Free tier, then from $25.49 / seat / month
  • Free trial Cartesia Free tier with 20,000 credits per month Rev Free plan with 45 AI transcription and caption minutes a month, plus free Rev AI credits worth 5 hours of Reverb transcription
  • Deployment Cartesia Cloud (SaaS), Browser-based Rev Cloud (SaaS), Browser-based, On-premise
  • Company size Cartesia Small and mid-sized, Enterprise Rev Freelancers, Small and mid-sized, Enterprise
  • Output Cartesia Low-latency real-time speech, instant clone from around three seconds Rev Transcripts, captions, subtitles and case documents

Every line is one datapoint from the table above, picked automatically. Nothing here is written text.

The trade-offs

Strengths and Limitations

Cartesia

Strengths

  • Lowest-latency real-time voice for agents
  • Instant three-second cloning
  • Cost-effective developer API

Limitations

  • Less expressive on long-form and audiobook content
  • Newer and developer-oriented

Rev

Strengths

  • Human transcription at a stated 99%+ accuracy alongside the machine tier
  • Developer API priced per hour of audio, from $0.10 on Reverb Turbo
  • Runs on-premises as well as in the cloud on the API side
  • Free credits worth 5 hours of transcription, with no card required

Limitations

  • Speech-to-text only, no text-to-speech, dubbing or voice cloning
  • The subscription is built around legal and investigative work, which is dead weight for other uses
  • The free plan covers 45 minutes a month and English only
  • Human services are charged on top of the subscription rather than included

Plans

Pricing

Cartesia

  • Free $0 20,000 credits per month plus $1 of prepaid agent usage. Text-to-speech and speech-to-text.
  • Pro $5 / month 100,000 credits, a commercial-use license and instant voice cloning.
  • Startup $49 / month 1.25 million credits, professional voice cloning and organizations.
  • Scale $299 / month 8 million credits, priority support and high concurrency limits.
  • Enterprise Not stated Custom credits and agent usage, custom concurrency limits, DPAs/BAAs and SSO.
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Rev

  • Free $0 45 AI transcription and caption minutes a month, English only, up to 5 files analysed at once, document editor and mobile app.
  • Essentials $25.49 Per seat per month billed annually at $305.90, or $29.99 billed monthly. Up to 3 seats, 5,000 AI minutes per seat per month in English and Spanish, up to 10 files analysed and 10% off human services.
  • Pro $47.99 Per seat per month billed annually at $575.88, or $59.99 billed monthly. Up to 5 seats, 10,000 AI minutes per seat per month across 37+ languages, up to 50 files analysed, image analysis, Clio integration and 15% off human services.
  • Unlimited Not stated Custom pricing. Unlimited seats and AI minutes, up to 500 files analysed, HIPAA and CJIS compliance, SSO and a dedicated specialist.
  • Rev AI pay-as-you-go $0.10 Per hour of audio on Reverb Turbo; Reverb is $0.20 an hour and foreign-language transcription $0.30 an hour across 56+ languages. Whisper Fusion and Large are $0.005 a minute. Human transcription through the API is $1.99 a minute. Insights are priced separately: language identification and forced alignment $0.003 a minute, topic extraction and sentiment analysis $0.0008 per 10 words, translation $0.002 to $0.025 a minute. Free credits equivalent to 5 hours of Reverb transcription to start.
  • Human services From $1.99 Per minute for human transcription and for human captions, with up to 15% off on a subscription. Legal rough drafts are $2.25 a page and legal premium transcripts $2.50 a page. Global subtitles run $6.49 to $15.99 a minute depending on the language, across 17 languages.
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What users say

Review Scores · opens after launch

Cartesia

Ease of use
Not rated yet
User interface
Not rated yet
Onboarding
Not rated yet
Support and service
Not rated yet
Value for money
Not rated yet
Features
Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Rev

Ease of use
Not rated yet
User interface
Not rated yet
Onboarding
Not rated yet
Support and service
Not rated yet
Value for money
Not rated yet
Features
Not rated yet

No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.

Where this comes from

Where this comes from

Cartesia https://cartesia.ai · no check date recorded yet

Rev https://www.rev.com · checked against the official source on 2026-09-04

This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.