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We're excited to share our latest project at Noxenum: Plapperi.ch, a groundbreaking text-to-speech engine specifically designed for Swiss German dialects.

Why Swiss German Needs Its Own TTS Engine

If you've ever tried using a standard High German TTS system to generate Swiss German audio, you know the problem: it sounds unnatural, forced, and frankly, wrong. That's because Swiss German isn't just High German with a different accent - it's a distinct set of dialects with unique phonetic patterns, rhythms, and that characteristic "sing-song" intonation that makes it instantly recognizable.

Until now, there hasn't been a TTS solution that truly captures the authenticity of Züritütsch, Bärndütsch, or any of the other regional Swiss German dialects. We built Plapperi to change that.

Built on Real Swiss German Data

Working together with SwissNLP, we've created Plapperi from the ground up using carefully curated Swiss German speech data. Our models aren't adapted from High German—they're trained specifically on native Swiss German speakers, capturing:

• Regional dialect variations: From Zürich to Wallis, each region has its distinct phonetic characteristics
• Natural prosody: The melodic intonation patterns that make Swiss German unique
• Authentic expressions: Real Swiss German vocabulary and phrasing, not translations

Developer-First Design

As an applied AI company, we know developers need tools that work seamlessly with their existing workflows. Plapperi offers:

• Simple REST API: Drop-in replacement for standard TTS engines
• Python SDK: Get started with just a few lines of code
• Easy integration: From web applications to voice assistants, Plapperi fits your stack

from plapperi import Plapperi

client = Plapperi(api_key="API_KEY")

# Translate High German to Swiss German dialect
translated_text = client.translation.translate(
   text="Hallo Welt.",
   dialect="ag",
)

# Generate natural-sounding audio
audio_bytes = client.synthetization.synth(
   text=translated_text,
   voice="aragon",
)


Where We Are Today - and Where We're Going

Plapperi is live with our V0.1 model, and we're already seeing exciting use cases across:

• Content creators producing Swiss German audio content
• Accessibility tools for the Swiss German-speaking community
• Educational applications teaching Swiss dialects
• Voice interfaces for Swiss-focused applications

But this is just the beginning.

We're Looking for Partners: Custom Voice Fine-Tuning

Here's where it gets really interesting. The voices you see in Plapperi today are placeholders - demonstrations of what the technology can do. The real power of Plapperi comes when we fine-tune voices for specific use cases and organizations.

We're actively seeking customers interested in fine-tuning custom voices for their specific purposes.

Whether you need:

• Brand-specific voices for your Swiss German marketing content
• Character voices for entertainment and gaming applications
• Professional narration voices for e-learning platforms and other media
• Accessibility voices tailored to specific user needs
• Regional dialect specialists for hyper-local content

We can work with you to create fine-tuned models that match your exact requirements. Our technology is flexible, and with the right voice data and training, we can achieve remarkable authenticity for your specific use case.

Why Partner with Us?

At Noxenum, we bring:

• Deep expertise in applied AI: We don't just implement models; we understand them deeply and can adapt them to your needs
• Swiss roots: Based in Aarau, we understand the Swiss market and Swiss German culture intimately
• Research partnership: Our collaboration with SwissNLP ensures we're working with cutting-edge NLP research
• Production-ready infrastructure: Our APIs are built for scale and reliability

Let's Talk

If you're interested in exploring custom voice fine-tuning for your organization, we'd love to hear from you. Whether you're building the next generation of Swiss German voice assistants, creating accessible content for the Swiss market, or developing innovative applications we haven't even thought of yet - let's explore what's possible together.

The current Plapperi voices show what the technology can do. Imagine what we could create specifically for your needs.

Ready to bring authentic Swiss German voices to your application?

Visit plapperi.ch to try the technology, explore our API documentation, and get in touch about custom voice development.

Plapperi is developed by Noxenum in collaboration with SwissNLP. Made with ❤️ in Aarau, Switzerland.

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