Cartesia Sonic
Sonic is the fastest human-like voice API.
Deepgram
Voice AI platform for developers.
Updated February 2026
| Cartesia Sonic | Deepgram | |
|---|---|---|
| Rating | 5.0★ | 4.9★ |
| Reviews | 15 | 58 |
| Pros | 4 | 17 |
| FactScore™ | 60.2 | 87.3 |
FactScore™ Comparison
FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.
Pros & Cons
Only in Cartesia Sonic — Pros
Real-time voice experiences Ease of use Diverse voice libraryBoth tools — Pros
Fast performanceOnly in Deepgram — Pros
High accuracy Speech-to-text API Real-time transcription Cost-effective Low latency Text-to-speech Easy-to-use API Customizability Multilingual support Voice recognition accuracy Free tier Speaker diarization Detailed time-stamped transcripts Easy integration Pricing Scalable transcription servicesOnly in Cartesia Sonic — Cons
—Both tools — Cons
—Only in Deepgram — Cons
Accuracy gap Text-to-speech accuracyDetails
| Cartesia Sonic | Deepgram | |
|---|---|---|
| Categories | Podcasting Tools, AI Voice Agents, Text-to-Speech Software | AI Voice Agents, Text-to-Speech Software, Transcription |
| Platforms | Web | Web |
| Became Popular | May 29, 2024 | March 16, 2016 |
| Website | cartesia.ai | deepgram.com |
Who Should Pick Which?
Choose Cartesia Sonic if...
- Real-time voice experiences
- Ease of use
- Diverse voice library
Choose Deepgram if...
- High accuracy
- Speech-to-text API
- Real-time transcription
With a FactScore™ of 60.2 vs 87.3, Deepgram leads in community reception. Cartesia Sonic uniquely offers Real-time voice experiences and Ease of use, while Deepgram stands out for High accuracy and Speech-to-text API.
What Users Say
Cartesia Sonic
Cartesia is amazing! They have enabled us to reduce system latency by hundreds of milliseconds – critical to making our conversations feel natural. Their streaming in, streaming out interface, pyth...
Cartesia is a game-changer for us. They provide high-quality voice APIs which are extremely fast and budget-friendly.
Fast, high-quality voice models in multiple languages. Great team and great product velocity.
Deepgram
Deepgram outperforms Google Speech-to-Text and AWS Transcribe for our interview transcription needs with higher accuracy for diverse accents and technical terminology (95%+ vs 85-90%). Unlike Whisp...
We’ve been using Deepgram and find its features invaluable. The natural handling of multiple languages and high transcription quality capture every nuance, while the speaker diarization makes subse...
Deepgram's technologies powered the voice AI in Poised Cupid. Deepgram's accuracy and real-time processing speed was unmatched. Their models helped AI Wingmate handle casual conversation amazingly ...
Related Comparisons
Frequently Asked Questions
Which is better, Cartesia Sonic or Deepgram?
Based on FactScore™, Deepgram leads with a score of 87.3 vs 60.2. Deepgram has a higher rating of 4.9★ compared to 5.0★.
What are the pros of Cartesia Sonic compared to Deepgram?
Cartesia Sonic uniquely offers: Real-time voice experiences, Ease of use, Diverse voice library.
What are the pros of Deepgram compared to Cartesia Sonic?
Deepgram uniquely offers: High accuracy, Speech-to-text API, Real-time transcription, Cost-effective, Low latency.
Is Cartesia Sonic better rated than Deepgram?
Cartesia Sonic is rated 5.0★ from 15 reviews. Deepgram is rated 4.9★ from 58 reviews.
What is the FactScore™ of Cartesia Sonic and Deepgram?
FactScore™ weighs rating and review volume together. Cartesia Sonic scores 60.2 and Deepgram scores 87.3.
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