kitio.aiCartesia Sonic vs Soniox
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Cartesia Sonic starts at $5/mo and Soniox starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Real-time speech under 90ms
- 44 languages
- Instant voice cloning
- Emotion and laughter control
- Voice localisation
- Real-time and async transcription
- 60+ languages
- Speaker diarization
- Mid-sentence language switching
- Agent echo cancellation
- Python and Node SDKs
| Feature | Cartesia Sonic | Soniox |
|---|---|---|
| Best for | Low-latency text-to-speech API for voice agents | Multilingual speech-to-text API for voice agents and transcription |
| Category | Audio & voice | Audio & voice |
| Pricing model | Freemium | Paid |
| Starting price | $5/mo | See pricing page |
| Free plan | Yes | No |
| Made by | Cartesia | Soniox |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Cartesia Sonic starts at $5/mo and Soniox starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
5 plans
Free
Free
- 20K credits per month
- Text to speech and speech to text
- $1 of prepaid voice agent usage
Pro
$5/mo
- 100K credits per month
- Commercial use license
- Instant voice cloning
Startup
$49/mo
- 1.25M credits per month
- Professional voice cloning
- $49 of prepaid agent usage
Scale
$299/mo
- 8M credits per month
- Priority support
- High concurrency limits
Enterprise
Contact sales
- Custom credits and volume pricing
- SSO and DPAs
- Shared Slack channel
3 plans
Async speech-to-text
$0.10 / hour
- File transcription
- Token-based billing
Real-time speech-to-text
$0.12 / hour
- Streaming transcription
- Same model as async
Text-to-speech
$0.70 / hour
- Generated speech
- Token-based billing
Prices in USD, checked Oct 29, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Cartesia Sonic
- Very fast time to first audio
- Wide language coverage in one model
- Cloning from ten seconds of audio
- Aimed at developers more than casual users
- Credit system takes a while to understand
- Commercial license needs a paid plan
Soniox
- Very low price per hour
- Strong multilingual support
- Features designed for voice agents
- Token-based billing takes some math
- Developer API, not a finished app
- Advanced features need integration work
Which one should you choose?
Choose Cartesia Sonic if you want:
- Very fast time to first audio
- Wide language coverage in one model
- Cloning from ten seconds of audio
Watch out: aimed at developers more than casual users.
Choose Soniox if you want:
- Very low price per hour
- Strong multilingual support
- Features designed for voice agents
Watch out: token-based billing takes some math.
Cartesia Sonic vs Soniox FAQ
What is the difference between Cartesia Sonic and Soniox?
Cartesia Sonic: Low-latency text-to-speech API for voice agents. Soniox: Multilingual speech-to-text API for voice agents and transcription. Both are audio & voice tools.
Is Cartesia Sonic or Soniox cheaper?
Cartesia Sonic starts at $5/mo and Soniox starts at See pricing page. Check both pricing pages for current plans.
Do Cartesia Sonic and Soniox have free plans?
Cartesia Sonic: Yes. Soniox: No.
Who makes Cartesia Sonic?
Cartesia Sonic is made by Cartesia, based in United States.
Who makes Soniox?
Soniox is made by Soniox.
Which should I choose, Cartesia Sonic or Soniox?
Choose Cartesia Sonic if you value very fast time to first audio and wide language coverage in one model. Choose Soniox if you value very low price per hour and strong multilingual support.