New: Soniox v5 Real-Time is here
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One platform for multilingual voice AI

Speech-to-text, text-to-speech, and translation built for real-time products with unmatched accuracy in 60+ languages.

Build with API

Trusted by teams building global voice products

The complete voice AI platform

Speech-to-Text API

Transcribe in real-time

Transcribe speech in real time across 60+ languages, with native-speaker accuracy for multilingual, language-switching, and multi-speaker conversations.

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Text-to-Speech API

Generate natural speech

Generate natural, high-fidelity speech in 60+ languages, with precise handling of alphanumerics, names, borrowed words, and language switching.

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Speech Translation API

Translate in real-time

Translate speech in real time across 3,600 language pairs, with low-latency output before sentences finish and high-quality multilingual results.

Explore Speech Translation API

The new standard for multilingual voice AI

Soniox unifies speech-to-text, text-to-speech, and translation in one platform, delivering lower latency, simpler architecture, and unmatched multilingual accuracy through a single API.

One API for the full voice stack

Use speech-to-text, text-to-speech, and translation through a single API and provider. Reduce integration complexity, simplify system design, and ship voice products faster.

Lower latency across every turn

Run transcription, translation, and speech generation on one real-time platform built for live interaction. Deliver faster turn-taking and more natural conversations.

Soniox API is built for low latency voice interactions

Voice agents with native-speaker accuracy

Build voice agents that recognize and generate speech with native-speaker accuracy across 60+ languages.

Soniox API is built for low latency voice interactions

Precise handling of alphanumerics

Capture and speak email addresses, phone numbers, addresses, IDs, and codes with the precision production voice agents require.

Built for the hardest parts of voice AI

Most voice platforms were built for English first. Soniox is built for high accuracy across 60+ languages, seamless language switching, alphanumerics, and low-latency interaction.

World’s most accurate speech-to-text

Unmatched recognition accuracy across languages, accents, numbers, names, and domain-specific vocabulary, engineered for fast, multi-speaker conversations and high-noise environments.

Text-to-speech built for precision

Generate high-fidelity, hallucination-free speech in 60+ languages. Built for the hardest production TTS challenges: alphanumerics, foreign names, language switching, and ultra-low-latency streaming.

Hi there! This is the appointment line for Dr. Okafor's office. Um, I'm calling to confirm your visit on Tuesday the 14th at 2:30.

Low-latency streaming for live interaction

Transcribe speech with sub-200ms latency and start generating audio from the first few words, before the full sentence is available.

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Translation for multilingual conversation

Real-time, context-aware translation across 60+ languages and 3,600 language pairs, engineered for code-switching environments where speakers switch languages mid-sentence.

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.

Compare STT liveCompare TTS liveCompare translation

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.

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 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.
  • 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

Build with API

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

Build a voice agent in your language

Soniox Speech-to-Text and Text-to-Speech allow you to build voice agents that understand and speak as a native speaker.

AfrikaansAlbanianArabicAzerbaijaniBasqueBelarusianBengaliBosnianBulgarianCatalanChineseCroatianCzechDanishDutchEnglishEstonianFinnishFrenchGalicianGermanGreekGujaratiHebrewHindiHungarianIndonesianItalianJapaneseKannadaKazakhKoreanLatvianLithuanianMacedonianMalayMalayalamMarathiNorwegianPersianPolishPortuguesePunjabiRomanianRussianSerbianSlovakSlovenianSpanishSwahiliSwedishTagalogTamilTeluguThaiTurkishUkrainianUrduVietnameseWelsh

Frequently asked questions

What is the Soniox voice platform?
Soniox is a unified multilingual voice API that provides real-time speech-to-text, translation, and streaming text-to-speech in a single platform. One integration gives you access to all voice capabilities across 60+ languages.
Which languages does the Soniox platform support?
Soniox supports 60+ languages for both speech-to-text and text-to-speech, including major global languages and many regional languages, with native-speaker accuracy across accents and dialects.
Can I use speech-to-text and text-to-speech together in one integration?
Yes. The Soniox platform provides both STT and TTS through a single API, so you can transcribe, translate, and generate speech without managing separate services or providers.
How does Soniox handle real-time translation?
Soniox delivers real-time, context-aware translation across 3,600 language pairs as the speaker is talking, not after they finish. It handles code-switching environments where speakers mix languages mid-sentence.
Is the Soniox platform fast enough for voice agents?
Yes. Soniox is engineered for live, low-latency voice interactions. Speech-to-text operates with sub-200ms latency, and text-to-speech begins streaming audio from the first few words, before the full sentence is available.
Can Soniox handle language switching mid-sentence?
Yes. Both STT and TTS support seamless language switching mid-sentence, accurately recognizing and generating mixed-language speech without manual configuration.
How does Soniox TTS handle alphanumerics and names?
Soniox TTS renders phone numbers, email addresses, IDs, and codes exactly as written, and pronounces person names, place names, and foreign words with the correct pronunciation, even across language boundaries.
Is the Soniox platform suitable for production and enterprise use?
Yes. Soniox is built for mission-critical production systems, offering:
- 99.9% uptime
- Scalable, production-hardened infrastructure
- Priority support with severity-based incident response
- Regional deployment for data residency and compliance
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 SOC 2 Type 2 compliant, ISO 27001 certified, and supports HIPAA and GDPR compliance.
Can I deploy Soniox in my region?
Yes. Soniox supports in-region deployment with the same models and APIs worldwide. Currently available in the US, EU, and Japan, with more regions coming soon.
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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Get started with the Soniox API

Create an account instantly, or contact us to design a custom package for your business.

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Documentation

Get up and running in minutes and spend your time building the product, not wrestling with the API.

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See what you’ll pay

Pay only for what you use with our flexible pricing. Built to scale with you.

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