kitio.aiCartesia vs Soniox
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Cartesia 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
- Sonic streaming TTS
- Ink speech-to-text
- Instant voice cloning
- Emotion and speed controls
- Voice agent platform
- Real-time and async transcription
- 60+ languages
- Speaker diarization
- Mid-sentence language switching
- Agent echo cancellation
- Python and Node SDKs
| Feature | Cartesia | Soniox |
|---|---|---|
| Best for | Low-latency text-to-speech and speech-to-text models for voice apps | 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 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/month
- $1 prepaid agents/month
- Text to speech and speech to text
Pro
$5/mo
- 100K credits/month
- Commercial use license
- Instant voice cloning
Startup
$49/mo
- 1.25M credits/month
- Pro voice cloning
Scale
$299/mo
- 8M credits/month
- Priority support
- High concurrency limits
Enterprise
Custom
- Volume pricing
- DPAs and BAAs
- SSO
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 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Cartesia
- Very low latency for real-time use
- Cheap entry plan with commercial rights
- Strong voice quality rankings
- Built for developers, not casual users
- Agent usage billed separately
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 if you want:
- Very low latency for real-time use
- Cheap entry plan with commercial rights
- Strong voice quality rankings
Watch out: built for developers, not 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 vs Soniox FAQ
What is the difference between Cartesia and Soniox?
Cartesia: Low-latency text-to-speech and speech-to-text models for voice apps. Soniox: Multilingual speech-to-text API for voice agents and transcription. Both are audio & voice tools.
Is Cartesia or Soniox cheaper?
Cartesia starts at $5/mo and Soniox starts at See pricing page. Check both pricing pages for current plans.
Do Cartesia and Soniox have free plans?
Cartesia: Yes. Soniox: No.
Who makes Cartesia?
Cartesia is made by Cartesia, based in United States.
Who makes Soniox?
Soniox is made by Soniox.
Which should I choose, Cartesia or Soniox?
Choose Cartesia if you value very low latency for real-time use and cheap entry plan with commercial rights. Choose Soniox if you value very low price per hour and strong multilingual support.