Included by default
Sovereign Cloud
- Hosting by EU companies only
- AWS, Google Cloud, Microsoft Azure and Lambda are not engaged
- No route for a US CLOUD Act order to reach your audio, text or voice profiles
- Included by default for EU/EEA customers
Voice AI Made in Europe
The European Cartesia alternative for voice agents
EU Sovereign Cloud included on every plan, no enterprise contract.
GDPRZero data retention for content dataEU AI Act · aligned with Article 50
Play the demo
“Good afternoon, your appointment is on 03/15/2025 at 2:30 p.m. The office is located at 42a Bridge Street. For questions, reach us at 02079460123 or info@clinic.co.uk.”
Real model output · Kugel v3Dates, addresses, phone numbers and email addresses, read correctly
Direct comparison
KugelAudio vs Cartesia
Both companies build real-time speech. Sovereignty, German and deployment decide it.
| Decision criterion | KugelAudio | Cartesia |
|---|---|---|
| EU Sovereign Cloud | Included on every plan | Not offered |
| Entity and governing law | German GmbH, EU law | US company, CLOUD Act applies |
| Time to first audio | Kugel v3: 91 ms | Sonic 3.5: 111 ms · Sonic Turbo: 127 ms |
| German numbers, IBANs and emails | Correct by default | No German-specific rules |
| German voices | 112 voices, regional variants | From a multilingual model |
| On-premise deployment | Live within days | Enterprise tier only |
Cartesia figures come from its public documentation and our benchmark run, August 2026. Please verify current terms for your plan.
Benchmarks
Faster, and preferred by listeners
Median time to first audio
Lower is better
KugelAudio · Kugel v391 ms
Cartesia · Sonic 3.5111 ms
Cartesia · Sonic Turbo127 ms
Measured over WebSocket streaming from an EU data centre. Network round-trip included, connection setup excluded.
Human preference, German
339 evaluations · OpenSkill ranking
| Model | Score | Win rate |
|---|---|---|
| KugelAudio | 26 | 78.0% |
| ElevenLabs Multilingual v2 | 25 | 62.2% |
| ElevenLabs v3 | 21 | 65.3% |
| Cartesia | 21 | 59.1% |
| VibeVoice | 10 | 28.8% |
| CosyVoice v3 | 9 | 14.2% |
Listeners heard a reference voice, then compared two models and picked the one that sounded more human and closer to the original. German samples covered neutral speech, shouting, singing and slurred speech.
Data sovereignty
Your data stays in Europe
Built, trained and hosted in the EU, outside the reach of the US CLOUD Act.
Live within days
On-premise
- Runs in your data centre, behind your firewall
- Same SDK and API as in the cloud
- Up to 192 concurrent calls per GPU, integrations unchanged
Custom dictionaries
Brand names? Right, every time.
Store the pronunciation once in your dictionary. From then on, the model says the name correctly in every single response.
- 1
Your text
“Order your new tableware at Villeroy & Boch.”
- 2
Your dictionary entry
Villeroy & Boch → [ˌvɪləɉɔɪ ʔʊnt ˈbɔx]
- 3
The output
Pronounced correctly. Every time, in every response.
Works the same for product names, technical terms and abbreviations, via IPA notation or a simple replacement.
Pricing
Priced per generated minute
No character accounting, no seat tiers.
kugel-2-turbo
Fast, budget-friendly text-to-speech model
€0.035 / min
~40–50 ms TTFA*~€42.42 / 1M characters**
- Guaranteed EU hosting
- EU Sovereign Cloud included (EU/EEA)
- Integrated normalizer
- Voice cloning
- Speed control
- Break tokens
- Word-level timestamps
- Dictionaries
kugel-3
Premium text-to-speech model with maximum naturalness
€0.07 / min
~60–80 ms TTFA*~€84.85 / 1M characters**
- Guaranteed EU hosting
- EU Sovereign Cloud included (EU/EEA)
- Integrated normalizer
- Voice cloning
- Speed control
- Break tokens
- Word-level timestamps
- Dictionaries
- IPA notations
On-premise, dedicated capacity and committed-usage rates are available on request.
* Inference TTFA, measured server-side. More in the latency docs · ** Character costs assume approximately 825 characters per minute.
FAQ
Questions about Cartesia alternatives
What is the best European alternative to Cartesia?
KugelAudio is a German company building real-time text-to-speech in 26 languages, hosted in the EU. The EU Sovereign Cloud option engages only EU companies as subprocessors, and it is included on every plan rather than sold as an enterprise add-on.
Is KugelAudio faster than Cartesia Sonic?
In our benchmark run, Kugel v3 reached a 91 ms median time to first audio, against 111 ms for Sonic 3.5 and 127 ms for Sonic Turbo. Measurements used WebSocket streaming from an EU data centre, with connection setup excluded.
Is there a Cartesia alternative that avoids the US CLOUD Act?
Yes. KugelAudio is a German GmbH under EU law with its IP in Europe. Under the Sovereign Cloud agreement, AWS, Google Cloud, Microsoft Azure and Lambda are not engaged, so no provider with a US parent processes your data.
How does KugelAudio compare to Cartesia on German?
In a blind A/B test with 339 human evaluations on German samples, KugelAudio ranked first with a 78.0% win rate and Cartesia fourth with 59.1%. KugelAudio also offers 112 German voices and German normalization of numbers, IBANs and email addresses.
Can I run the models on my own infrastructure?
Yes, within days. The models run in your data centre behind your firewall with the same SDK and API as the hosted service, handling up to 192 concurrent calls per GPU.
Ready to build your first voice?
Real-time, EU-hosted voice that scales with your product.