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World’s most accurate Welsh speech-to-text

The world’s most accurate real-time speech-to-text API for Welsh, powering voice agents, live systems, and applications across 60+ languages.

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Trusted by teams building global voice products

Livekit
Krisp
Pipecat
Summary AI
Perplexity
Samsung
Wispr Flow
LG
Agora
Retell AI
Fireflies.ai
Skit.ai
Kindroid
Deliver Health
Truecaller
Journalia
Mobius
TranscribeMe
Vapi
Zomato
SLNG
Japan AI
Boost.ai
Convin
Genspark
HappyRobot
Uniscribe
Jamie.ai
InteractCX
The Plato
MobilApp
Onvego
Wonderful.ai
Manifone
Tana
Transync AI
SotaTek

Unmatched accuracy in Welsh and 60+ languages

Welsh is spoken by over 900 thousand people worldwide — primarily in United Kingdom, with speakers around the world. For years, Welsh speech-to-text has fallen short, failing at fundamentals like accurate and reliable recognition, multiple languages, and alphanumerics. It converted Welsh audio into words, but the words lacked meaning and context.

Soniox reimagined everything Welsh speech-to-text got wrong. You can speak naturally, switch languages mid-sentence, spell out codes and names, or ask for instant Welsh translation, all in real-time. Soniox doesn’t just transcribe Welsh speech – it understands it.

Welsh native-speaker accuracy

Accurate Welsh speech recognition across accents, dialects, and real-world conversational speech.

stt · accuracy
Welsh

“We tried a dozen speech-to-text and translation services. Soniox is the best, so that's what we use.”
MentraCayden Pierce, CEO/CTO at Mentra

Automatically detect and switch languages with Welsh

Soniox identifies the language automatically and follows changes between Welsh and other languages as they happen, even within the same sentence.

stt · language switching

Get every character right in Welsh

Names, phone numbers, addresses, IDs, serial numbers, and other structured information spoken in Welsh are recognized precisely.

Phone number

Fy rhif i yw +49 172 684 9317.

Reference ID

Rhif yr achos yw AX-4927-B.

Mixed alphanumeric

Rhif cyfresol y ddyfais yw XR8Q-19F2.

International name

Bydd Nguyễn Minh Anh yn ymuno â'r cyfarfod am dri.

Improve Welsh accuracy with context

Provide terminology, names, or custom vocabulary to guide Welsh recognition toward the right words, without retraining models.

stt · context

Know when the speaker is finished

Soniox detects when a Welsh speaker has actually completed their thought, not just when they pause.

stt · turn-taking

Know who said what in Welsh

Soniox separates Welsh speakers in real time, so every word stays connected to the person who said it.

stt · diarization

Estimate your Welsh speech-to-text cost

Choose real-time or async transcription and set your monthly audio volume to estimate your Soniox API cost.

Pricing calculator

Stop overpaying for Welsh speech AI

Sonioxvs

1,000 hours of audio / month

1025501002505001k2.5k5k10k100k

Pricing assumptions

Based on public pay-as-you-go pricing. Enterprise discounts and committed-use contracts may differ. Some providers charge separately for certain features. The calculator uses the public price for the provider configuration that most closely matches Soniox.

Speech infrastructure for massive scale

Soniox Text-to-Speech API performance and reliability

Build on one API and deploy in your region

Use the same models and API everywhere, with in-region processing to meet latency, data residency, and regulatory requirements.

Available: US, EU, Japan, India
Coming soon: Korea, Australia, Canada, Saudi Arabia, UK, Brazil

View data residency docs
Soniox Text-to-Speech API performance and reliability

Run mission-critical systems with confidence

  • 99.9% uptime
    Production-hardened infrastructure with monitoring and redundancy.
  • low-latency streaming
    Process speech in real time with low latency for responsive voice applications.
  • Priority support
    Severity-based incident response with direct access to the Soniox team.
Onvego uses Soniox Text-to-Speech API for multilingual voice experiences

"Before Soniox, our international users always had a noticeably different experience. Now accuracy and responsiveness match across all regions…it feels like one system instead of five."

Alon Yair CTO of Onvego

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Welsh speech-to-text use cases

Soniox is built for Welsh voice applications where accuracy, latency, and reliability matter at scale.

Call center

Real-time transcription, agent assist, and searchable records for every Welsh customer interaction.

Medical transcription

Accurate transcription of Welsh clinical speech, including specialist terminology and patient documentation.

Media transcription

Fast, accurate transcripts of Welsh audio and video content at any scale.

Speech analytics

Extract insights, trends, and signals from large volumes of spoken Welsh conversation data.

Speech translation

Real-time or batch translation of spoken Welsh content across 60+ languages with no loss of accuracy.

Voice agents

Low-latency, high-accuracy Welsh speech input as the foundation for conversational AI products.

Start transcribing Welsh speech from $0.10 per hour of audio.

View pricing

Use Soniox in popular frameworks

Soniox integrates seamlessly with leading real-time communication platforms, AI frameworks, automation tools, and developer SDKs.

An open source framework and developer platform for building, testing, deploying, scaling, and observing agents in production.

Open source framework for voice and multimodal conversational AI.

Twilio is a cloud-based customer engagement platform (CPaaS) that provides APIs, allowing developers to integrate voice, messaging (SMS, WhatsApp), email, and authentication capabilities into applications.

Open-source development framework designed to build applications powered by large language models (LLMs).

The open-source AI toolkit designed to help developers build AI-powered applications and agents with React, Next.js, Vue, Svelte, Node.js, and more.

Open-source AI SDK with a unified interface across multiple providers. No vendor lock-in, no proprietary formats.

n8n is a powerful, low-code/pro-code workflow automation tool that connects various applications, APIs, and databases to automate tasks.

Build the next generation of voice products, from agents and wearables to dictation, translation, and real-time multilingual experiences.

Go global with one API

Get production-ready speech-to-text recognition, transcription, and translation in 60+ languages.

AfrikaansAlbanianArabicAzerbaijaniBasqueBelarusianBengaliBosnianBulgarianCatalanChineseCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMalayalamMarathiNorwegianPersianPolishPortuguesePunjabiRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilTeluguThaiTurkishUkrainianUrduVietnameseWelsh

Privacy and compliance, built right in

Never stored, never saved.

Audio stays in memory, everything is processed in real-time.

Built for privacy-critical use cases.

Adhering to leading global security, privacy, and compliance standards.

Trusted where privacy matters most.

Used in industries where speech is sensitive, from healthcare to enterprise.

Soniox is Soc 2 Type 2 compliant
Soniox is ISO 27001:2022 compliant
Soniox is HIPAA compliant
Soniox is GDPR compliant
SOC 2 Type 2 · ISO/IEC 27001:2022 · HIPAA · GDPR

Frequently asked questions

Does Soniox support real-time speech-to-text for Welsh?
Yes. Soniox provides true real-time speech-to-text for Welsh, streaming words as they are spoken — without waiting for pauses or sentence boundaries. This enables low-latency voice agents, live captions, and interactive systems.
How accurate is Soniox for Welsh?
Soniox delivers native-speaker accuracy in Welsh, with industry-leading error rates across accents, dialects, and real-world speech. Unlike systems optimized mainly for English, Soniox is trained and evaluated across 60+ languages from the ground up.
Can Soniox handle mixed-language speech involving Welsh?
Yes. Soniox automatically detects and transcribes language switching mid-sentence, even when Welsh is mixed with English or other languages. No configuration or manual language hints are required.
Does Soniox support real-time translation from and to Welsh?
Yes. Soniox supports real-time, mid-sentence translation between Welsh and any of 60+ supported languages — covering 3,600 language pairs. Translation streams continuously as people speak, not after they finish.
Can Soniox recognize numbers, names, and alphanumerics in Welsh?
Yes. Soniox accurately captures phone numbers, email addresses, IDs, codes, and other alphanumerics as they are spoken in Welsh, with precision down to each digit and character.
Does Soniox support speaker identification in Welsh?
Yes. Soniox performs real-time speaker separation and identification in Welsh, ensuring transcripts clearly show who said what — even in fast or overlapping conversations.
Can I improve accuracy for domain-specific Welsh use cases?
Absolutely. Soniox supports domain-specific context for Welsh, allowing you to provide lightweight hints such as industry, terminology, or participant names to further improve recognition accuracy — without retraining models.
Where is Welsh speech data processed and stored?
Soniox processes and stores speech data entirely within your selected region, using identical models and APIs globally. This supports data residency, privacy, and regulatory requirements for enterprise and public-sector deployments.
How does Soniox handle privacy and data security?
Speech data is processed and stored entirely within your selected region, supporting data residency and regulatory requirements. Soniox is designed with privacy, security, and enterprise compliance in mind.
Is Soniox suitable for production and enterprise workloads in Welsh?
Yes. Soniox is built for mission-critical, real-time systems, offering:
- 99.9% uptime
- Sub-200ms streaming latency
- Production-hardened infrastructure
- Priority enterprise support
How do I get started?
You can explore the API documentation to start building immediately, or contact Soniox for production and enterprise deployments.
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