New: Soniox Text-to-Speech is here
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The world’s most accurate speech-to-text

Real-time speech-to-text and translation across 60+ languages, built for voice agents, live systems, and global products.

Built for the hardest parts of speech recognition

Speech-to-text has improved dramatically for English, but most languages still do not have STT that is accurate enough for serious use.

Across much of the world, accents are misheard, names and numbers are transcribed incorrectly, and mixed-language speech falls apart. In noisy environments and multi-speaker conversations, error rates rise even further. And for real-time systems, latency and poor turn-taking still make voice experiences feel broken.

Soniox Speech-to-Text changes that. It is the first STT platform to deliver native-speaker accuracy across 60+ languages, with robust handling of multilingual and code-switching speech, precise recognition of alphanumerics and domain-specific terms, low-latency streaming, speaker diarization, and infrastructure designed for production scale.

Unmatched speech-to-text accuracy

Native-speaker accuracy

Unlike providers that mainly perform well in English, Soniox delivers native-speaker accuracy across 60+ languages, including dialects, accents, and mixed-language speech.

Soniox supports 60+ languages with native-speaker accuracy

Language switching mid-sentence

People often mix languages within a sentence or phrase. Soniox instantly detects language changes and transcribes every word in the correct language.

Soniox supports switching languages mid sentence.

Capture alphanumerics in any language

From phone numbers to reference IDs, Soniox recognizes alphanumerics exactly as spoken in any language, with precision down to the last digit and character.

Soniox captures ultra-accurate alphanumerics.

Know when a speaker is finished

Soniox goes beyond silence detection, using tone, meaning, and conversational flow to detect when a speaker is truly finished. The result is faster, smoother, and more natural turn-taking.

Soniox supports accurate endpoint detection for voice agents.

Improve accuracy with context

Provide details like terminology, topic, participant names, or custom vocabulary to guide recognition toward the right words for your use case.

Soniox supports passing custom vocabulary to improve recognition.

Separate and identify speakers

Soniox separates and identifies speakers across 60+ languages, so transcripts stay organized, searchable, and clear even in fast-moving conversations.

Soniox supports speaker diarization.

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
Coming soon: Korea, Australia, Canada, India, Saudi Arabia, UK, Brazil

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

Run mission-critical systems with confidence

  • 99.9% uptime
    Production-hardened infrastructure with monitoring and redundancy.
  • Ultra-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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Use cases

Soniox is built for developers and teams who need accurate, real-time speech understanding at scale.

support_agent

Call center

For contact centers that need real-time transcription, agent assist, and searchable records of every customer interaction.

stethoscope

Medical transcription

For healthcare platforms that need accurate transcription of clinical speech, including specialist terminology and patient documentation.

video_library

Media transcription

For media companies and content platforms that need fast, accurate transcripts of audio and video at any scale.

analytics

Speech analytics

For teams that need to extract insights, trends, and signals from large volumes of spoken conversation data.

translate

Speech translation

For products that need real-time or batch translation of spoken content across 60+ languages with no loss of accuracy.

smart_toy

Voice agents

For developers building conversational AI products that need low-latency, high-accuracy speech input as their foundation.

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

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.

Compare Soniox side by side

Compare Soniox side by side with other providers across speech-to-text and text-to-speech. Live inputs. Transparent results.

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Go global with one API

Get production-ready text-to-speech in 60+ languages.

AfrikaansAlbanianArabicAzerbaijaniBasqueBelarusianBengaliBosnianBulgarianCatalanChineseCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMalayalamMarathiNorwegianPersianPolishPortuguesePunjabiRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilTeluguThaiTurkishUkrainianUrduVietnameseWelsh

Frequently asked questions

Which languages does the Soniox API support?arrow_downward
The Soniox API supports 60+ languages for real-time speech-to-text and translation. This includes major global languages and many regional languages, with native-speaker accuracy across accents and dialects.
Does Soniox require switching between models for different languages?arrow_downward
No. Soniox uses a single, unified model architecture that works across all supported languages. You don’t need to load, manage, or switch models when handling multilingual or mixed-language speech.
Can the Soniox API transcribe and translate speech at the same time?arrow_downward
Yes. Soniox can transcribe speech and produce translations in real time, as the speaker is talking — without waiting for sentence boundaries or pauses.
Can Soniox handle language switching mid-sentence?arrow_downward
Yes. Soniox can accurately recognize and processmixed-language speech, including cases where speakers switch languages mid-sentence or mid-conversation, without manual configuration.
Is the Soniox API suitable for real-time and low-latency applications?arrow_downward
Absolutely. Soniox is designed for live, streaming use cases, delivering sub-200ms latency and word-by-word output suitable for voice agents, live meetings, call centers, and interactive systems.
Is the Soniox API suitable for production and enterprise use?arrow_downward
Yes. Soniox is built for mission-critical production systems, offering:
- 99.9% uptime
- Scalable, production-hardened infrastructure
- Priority support with severity-based incident response
- Identical models and APIs across regions
How does Soniox perform with noisy or real-world audio?arrow_downward
Soniox is optimized for real-world speech, including background noise, overlapping speakers, accents, and imperfect microphones. It performs reliably in meetings, calls, and everyday environments — not just clean studio audio.
Can Soniox distinguish between different speakers?arrow_downward
Yes. Soniox supports speaker detection, allowing transcripts to clearly separate who said what in multi-speaker conversations.
How does Soniox handle privacy and data security?arrow_downward
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.
Can I customize accuracy for my domain or use case?arrow_downward
Yes. Soniox supports domain-specific context and customization, improving accuracy for names, terminology, numbers, and specialized vocabulary relevant to your application.
How hard is it to integrate the Soniox API?arrow_downward
Integration is straightforward. Soniox provides clear documentation, real-time streaming APIs, and production-ready SDKs, allowing most teams to get a working prototype running quickly.
How do I get started?arrow_downward
You can explore the API documentation to start building immediately, or contact Soniox for production and enterprise deployments.
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