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AI Voice & Speech Comparison

Google Cloud Text-to-Speech vs. Rev

At a glance

At a glance

Google Cloud Text-to-Speech

Best for

Best for developers on Google Cloud who need speech synthesis in an application and want to pick their own quality and price point.

  • Freelancers
  • 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 Google Cloud Text-to-Speech Rev
Starting price lower value Free tier, then from $4 per 1 million characters Pay-as-you-go by characters sent for synthesis, counting spaces, newlines and most SSML tags, with a free monthly allowance per voice type. Standard and WaveNet $4 per 1 million characters, free to 4 million a month. Neural2 and Polyglot $16, Chirp 3 HD $30 and Studio $160, each free to 1 million a month. Instant Custom Voice $60 with no free allowance. Gemini-TTS is billed per token instead, from $0.50 per 1 million input text tokens and $10 per 1 million output audio tokens, also with no free allowance. 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 monthly allowance: 4 million characters on Standard and WaveNet voices, 1 million on Chirp 3 HD, Neural2, Polyglot and Studio voices Free plan with 45 AI transcription and caption minutes a month, plus free Rev AI credits worth 5 hours of Reverb transcription
Output Synthesised speech, single request, streaming or long-form, as LINEAR16, MP3, OGG_OPUS, ALAW, MULAW, PCM or M4A Transcripts, captions, subtitles and case documents
API Yes, the Cloud Text-to-Speech API with client libraries and a command-line path Yes, Rev AI for asynchronous and streaming speech-to-text, plus a human transcription API
Languages Google's own figure is 220+ voices across 40+ languages 57+ languages for the Rev AI speech-to-text API; 37+ on the Pro subscription; human captions in English and Spanish and subtitles in 17 languages
Hosting Cloud (Google Cloud), with a global endpoint and regional endpoints Cloud or on-premises for the Rev AI platform
Voice cloning Yes, Chirp 3 Instant Custom Voice builds a personal voice model from a short high-quality recording, usable afterwards for streaming and long-form synthesis. Access is restricted to allow-listed customers and is arranged through the sales team rather than self-service. A cloning key created for en-US can also speak German, US and European Spanish, Canadian and European French and Brazilian Portuguese No, Rev works only on incoming speech and does not synthesise or clone voices
Real-time use Yes, bidirectional streaming synthesis for live use, alongside ordinary single requests and a separate long-form path for large documents 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
Speech-to-speech and dubbing No. This service synthesises speech from text only. Recognition is the separate Speech-to-Text service and translation the separate Translation AI service 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 SSML, pace control from 0.25x to 2x, experimental pause tags and custom pronunciation in IPA or X-SAMPA phonetic encoding, device profiles that tune output for the playback hardware, and text-based prompting on the Gemini-TTS models, which take a written description of the delivery rather than markup 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 Instant Custom Voice sits behind an allow list that is granted by the sales team, and enrolment requires the speaker to record a consent statement that Google supplies in the language being cloned, in English: "I am the owner of this voice and I consent to Google using this voice to create a synthetic voice model." The recording is part of the enrolment, so a voice cannot be cloned from found audio 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 Freelancers, Small and mid-sized, Enterprise 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 Google Cloud Text-to-Speech Free tier, then from $4 per 1 million characters Rev Free tier, then from $25.49 / seat / month
  • Free trial Google Cloud Text-to-Speech Free monthly allowance: 4 million characters on Standard and WaveNet voices, 1 million on Chirp 3 HD, Neural2, Polyglot and Studio voices Rev Free plan with 45 AI transcription and caption minutes a month, plus free Rev AI credits worth 5 hours of Reverb transcription
  • Deployment Google Cloud Text-to-Speech Cloud (SaaS), Browser-based Rev Cloud (SaaS), Browser-based, On-premise
  • Hosting Google Cloud Text-to-Speech Cloud (Google Cloud), with a global endpoint and regional endpoints Rev Cloud or on-premises for the Rev AI platform
  • Languages Google Cloud Text-to-Speech Google's own figure is 220+ voices across 40+ languages Rev 57+ languages for the Rev AI speech-to-text API; 37+ on the Pro subscription; human captions in English and Spanish and subtitles in 17 languages

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

The trade-offs

Strengths and Limitations

Google Cloud Text-to-Speech

Strengths

  • One API spans cheap legacy voices at $4 per million characters and current HD voices at $30
  • Gemini-TTS takes a written prompt for the delivery instead of hand-written SSML markup
  • Free monthly character allowance on every voice type except Gemini-TTS and custom voices
  • Bidirectional streaming, single request and long-form synthesis from the same service
  • Voice cloning requires a recorded consent statement from the speaker, in their own language

Limitations

  • Text to speech only: recognition and translation are separate Google Cloud services
  • Instant Custom Voice is restricted to allow-listed customers and goes through sales
  • Studio voices cost $160 per million characters, forty times the Standard rate
  • Gemini-TTS is billed per token rather than per character, so the two price models do not compare directly
  • The overlapping generations of voice model take some reading before the right one is obvious

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

Google Cloud Text-to-Speech

  • Standard and WaveNet voices $4 Per 1 million characters. Free for the first 4 million characters a month.
  • Neural2 and Polyglot voices $16 Per 1 million characters. Free for the first 1 million characters a month. Polyglot is in preview.
  • Chirp 3: HD voices $30 Per 1 million characters. Free for the first 1 million characters a month.
  • Chirp 3: Instant Custom Voice $60 Per 1 million characters. No free allowance, and access is restricted to allow-listed customers.
  • Studio voices $160 Per 1 million characters. Free for the first 1 million characters a month. A legacy model.
  • Gemini-TTS Not stated Billed per token with no free allowance. Gemini 2.5 Flash TTS costs $0.50 per 1 million input text tokens and $10 per 1 million output audio tokens; Gemini 2.5 Pro TTS and Gemini 3.1 Flash TTS (preview) cost $1.00 and $20.00 respectively. Audio tokens correspond to 25 tokens per second of audio.
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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

Google Cloud Text-to-Speech

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

Google Cloud Text-to-Speech https://cloud.google.com/text-to-speech · checked against the official source on 2026-09-13

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.