Speechmatics vs Cartesia AI

Comprehensive side-by-side comparison — features, pricing, performance, and more.

Data last refreshed October 2026

Speechmatics

Speech APIs powering Voice AI — multilingual speech-to-text

Freemium

82% verification coverage

Cartesia AI

Cartesia AI, Inc.

Real-time speech & transcription models for voice agents

Freemium

81% verification coverage

Trust & Reliability

Speechmatics

Users:1M-10M

Customers (per vendor):AI Media, Adobe, NCI +7

GDPR

SOC 2

HIPAA

Cartesia AI

Uptime:99.77%Status page

Customers (per vendor):ServiceNow, Quora, EliseAI +7

GDPR

SOC 2

HIPAA

Overall Winner: Speechmatics

7.3/10 vs Cartesia AI at 6.3/10

Leads in:

Support

Compliance & Data Protection

Integration

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

AI Comparison Summary

Speechmatics

7.3

avg score

Cartesia AI

6.3

avg score

Speechmatics leads overall — particularly in Support and Integration and 1 more.

Based on 6 dimensions

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

Overall Winner

Speechmatics

7.3 / 10

Speechmatics

Best For

Developers building voice AI agents needing sub-second, speaker-aware STT and TTS

Healthcare providers supporting ambient scribe and dictation with specialized medical models

Media and broadcast companies requiring accurate live captioning at scale

Contact centers aiming to reduce wait times and improve customer experience with speech analytics

Cartesia AI

Best For

Financial services for fraud detection and authentication

Customer service teams enhancing experience and security

Localization teams dubbing videos into multiple languages

Enterprises requiring low-latency conversational AI

* Verdict is based on our algorithmic scoring of publicly available data. Learn about our methodology

Speechmatics is best for

🎧Customer Support7.0🎵Audio & Voice6.5🔍Research6.0

Cartesia AI is best for

🎵Audio & Voice7.3🎬Video6.5🎧Customer Support5.8

Filter by your use case:

Limitations

Speechmatics

Cons

SSO is a paid add-on at $280/month
Self-serve concurrent real-time sessions are limited to 50 (2 on Free plan)
Self-serve pre-recorded files per second are limited to 10
On-premise, virtual appliance, on-device, and hybrid deployments are only available on Enterprise plans
Healthcare vocabulary is not available on Melia 1, Enhanced, or Standard models
Mixed-language transcription, code-switching, language hints, and language labeling are not available on Enhanced or Standard models
Custom dictionary is not available on Melia 1 or Oak 1 models

Cartesia AI

Cons

Free and Pro plans do not include Professional Voice Cloning
Free and Pro plans do not include PVC slots
LLM usage during calls is free for UI-created agents for a limited time
Evaluations are free of charge for a limited time only

Weighted Score — Adjust What Matters to You

Pick a profile or drag sliders — scores and radar update instantly on the right.

Quick profiles:

Ease of Use5

Customization5

Support5

Integration5

Compliance & Data Protection5

Performance5

Planning Quality5

Dimension Comparison

Speechmatics

7.3

/ 10

Clear winner

Cartesia AI

6.3

/ 10

Dimension Breakdown

Ease of Use

How intuitive is onboarding, UI navigation, and day-to-day usage for the target audience?

Speechmatics

4.0

Cartesia AI

4.0

Customization

Calculated

How much can users tailor workflows, settings, prompts, or outputs to their needs?

Speechmatics

7.0

Cartesia AI

7.0

Support

How strong is the documentation, customer support, community, and learning resources?

Speechmatics

8.0▲ +2.0

Cartesia AI

6.0

Integration

Calculated

How well does it connect with other tools, APIs, and workflows?

Speechmatics

7.0▲ +2.0

Cartesia AI

5.0

Compliance & Data Protection

Calculated

Compliance certifications and data-protection posture, counted from ten verified signals: SOC 2 Type II, GDPR compliance, HIPAA, WCAG AA/AAA, PII redaction, licensed-only training, a published sub-processor list, a downloadable DPA, not training on user data, and a documented deletion path

Speechmatics

8.0▲ +2.0

Cartesia AI

6.0

Performance

Calculated

Latency + throughput speed

Speechmatics

10.0

Cartesia AI

10.0

Planning Quality

Calculated

Multi-step planning depth + replanning capability

Speechmatics

—

Cartesia AI

—

Calculated = derived from structured signals (integration count, API/open-source config, compliance certs, response-time). AI = LLM-assessed from public website content. Methodology

Task Performance

Speechmatics

Task

Cartesia AI

5.0

Voice Naturalness

9.0

8.0

Language Coverage

8.0

1.0

Speaker Cloning

9.0

8.0

Transcription Accuracy

8.0

9.0

Real Time Processing

10.0

2.0

Emotion Control

8.0

7.0

Noise Handling

6.0

7.0

Format Support

7.0

8.0

Custom Vocabulary

8.0

6.0

Language Translation

4.0

Format Conversion

5.0

8.0

Batch Processing

5.0

* Task scores (1–10) are algorithmically generated from publicly available data.

Data is sourced from public information and vendor websites. It may not always be up-to-date — verify pricing and features directly with the vendor before purchasing.Report inaccuracy

Frequently Asked Questions

What are the main differences between Speechmatics and Cartesia AI?

Speechmatics — "Speech APIs powering Voice AI — multilingual speech-to-text". Cartesia AI — "Real-time speech & transcription models for voice agents". The Features section on this page compares them side by side.

Who is Speechmatics best for compared with Cartesia AI?

Speechmatics is best for Developers building voice AI agents needing sub-second, speaker-aware STT and TTS; and for Healthcare providers supporting ambient scribe and dictation with specialized medical models. Cartesia AI is best for Financial services for fraud detection and authentication; and for Customer service teams enhancing experience and security.

How does the pricing of Speechmatics compare with Cartesia AI?

Speechmatics is freemium, includes a free plan. Cartesia AI is freemium, includes a free plan, paid plans start at $5/month. Always verify current pricing with the vendor.

Does Speechmatics or Cartesia AI have a free plan?

Speechmatics has a free plan. Cartesia AI has a free plan. Always verify current pricing with the vendor.

Do Speechmatics and Cartesia AI offer an API?

Speechmatics offers a public API. Cartesia AI offers a public API.

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