Best for
Best for developers building low-latency, real-time voice agents.
- Small and mid-sized
- Enterprise
AI Voice & Speech Comparison
Cartesia vs. Speechmatics
At a glance
At a glance
Best for
Best for teams transcribing real conversations across accents and languages, including where the audio may not leave their own infrastructure.
- Small and mid-sized
- Enterprise
Cataleo does not name a winner. Both statements come from the vendors themselves.
Full Comparison
| Criterion | Cartesia | Speechmatics |
|---|---|---|
| Starting price | Free tier; Pro from $5 / month Usage-based credits and agent minutes. Pro adds a commercial-use license and instant voice cloning. | lower value From $0.129 / hour of audio Pro tier rate, billed to the second with no commitment. Volume discounts of 20% apply automatically above 500 hours per month for each speech-to-text type, with further discounts above 24,000 hours a year. One credit equals one dollar. |
| Free trial | Free tier with 20,000 credits per month | Free tier with $100 in credit, no card required |
| Commercial use | Paid | Yes, usage-based |
| Output | Low-latency real-time speech, instant clone from around three seconds | Transcripts, translations and synthesised speech |
| API | Yes | Yes, batch and real-time speech-to-text, text-to-speech, translation and a management API |
| Hosting | Not stated | Cloud, CPU or GPU containers, Kubernetes, on-premises virtual appliance, or on-device |
| Made in | Not stated | United Kingdom |
| Voice cloning | Yes, instant cloning from around three seconds, plus a Pro clone trained on 30 minutes or more of audio | No, the text-to-speech API ships four fixed voices, sarah and theo in British English and megan and jack in American English, and the documentation describes no custom or cloned voice; speed, pitch and emphasis are not adjustable either |
| Real-time use | Yes, real-time text-to-speech (Sonic), built for live voice agents | Yes, streaming transcription returned in under a second, alongside batch transcription of recorded files |
| Languages | Yes, Sonic 3.6 covers 44 languages natively, chosen per request with a language parameter and regional locale variants | 55+ languages and dialects with accent, dialect and code-switching coverage; translation across 69 language pairs |
| 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 | Audio translation across 69 language pairs, returned as translated transcript rather than dubbed audio; a Voice Agent API is in early access |
| 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 | Speaker diarization and identification, custom dictionary, language identification, background speech filtering, and speech intelligence for summaries, sentiment, topics and auto-chapters |
| 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 | Data is not logged as standard; container, Kubernetes, virtual appliance and on-device deployment keep audio inside your own infrastructure |
| Deployment | Cloud (SaaS), Browser-based | more entries Cloud (SaaS), Browser-based, On-premise |
| Support | Not stated | Email helpdesk |
| Onboarding | Documentation and knowledge base | Documentation and knowledge base |
| Company size | Small and mid-sized, Enterprise | Small and mid-sized, Enterprise |
| Integrations | Not stated | LiveKit, Pipecat, Vapi, Zapier |
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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 Speechmatics From $0.129 / hour of audio
- Free trial Cartesia Free tier with 20,000 credits per month Speechmatics Free tier with $100 in credit, no card required
- Deployment Cartesia Cloud (SaaS), Browser-based Speechmatics Cloud (SaaS), Browser-based, On-premise
- Commercial use Cartesia Paid Speechmatics Yes, usage-based
- Output Cartesia Low-latency real-time speech, instant clone from around three seconds Speechmatics Transcripts, translations and synthesised speech
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
Speechmatics
Strengths
- 55+ languages with explicit accent, dialect and code-switching coverage
- Runs in the cloud, in containers, on-premises or on-device
- $100 in credit to start, with no card required
- Data is not logged as standard
Limitations
- A developer API rather than a ready-made voice studio
- Text-to-speech on the free tier covers English only
- The Voice Agent API is still in early access
- Volume discounts start at 500 hours a month, so small workloads pay the full rate
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.
Speechmatics
- Free $0 $100 in credit, no card required. 55+ languages for speech-to-text, 2 concurrent real-time sessions and low-latency English text-to-speech.
- Pro $0.129 Per hour of audio, billed to the second with no commitment. 50 concurrent real-time sessions, 10 file jobs per second and email support.
- Enterprise Not stated Volume-based pricing that scales with usage, unlimited concurrency and no rate limits, custom models, custom vocabularies and formatting rules, and SaaS or on-premises deployment.
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.
Speechmatics
- 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
Speechmatics https://www.speechmatics.com · checked against the official source on 2026-08-30
This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.