English speech-to-text API
STT API for real-time and async English transcription in voice agents, dictation, and meeting notes. With speaker diarization, end-of-turn detection, and mid-sentence code-switching between English and 60+ other supported languages.
$0.10/hour async · $0.12/hour real-time
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English speech recognition for production voice apps
English is spoken by more than 1.5 billion people across United States, United Kingdom, Canada, Australia, New Zealand, Ireland, South Africa, and beyond. If your voice agent, dictation app, or meeting notetaker serves them, speech-to-text has to handle English the way people actually speak it: regional accents, speakers who switch to other languages mid-sentence, and names, numbers, and IDs that have to come out exactly right.
Soniox STT transcribes English with native-speaker accuracy in real time over a WebSocket or asynchronously from recorded files, through one multilingual API built for 60+ languages. It follows speakers into other languages, labels who said what, and returns timestamps. Transcription biasing toward English is available through the language hints option.
English native-speaker accuracy
Accurate English speech recognition across accents, dialects, and real-world conversational speech.
“We tried a dozen speech-to-text and translation services. Soniox is the best, so that's what we use.”
Cayden Pierce, CEO/CTO at MentraAutomatically detect and switch languages with English
Soniox identifies the language automatically and follows changes between English and other languages live, even within the same sentence.
Get every character right in English
Names, phone numbers, addresses, IDs, serial numbers, and other structured information spoken in English are recognized precisely.
Phone number
My number is +49 172 684 9317.
Reference ID
The case number is AX-4927-B.
Mixed alphanumeric
The device serial number is XR8Q-19F2.
International name
Nguyễn Minh Anh will join the meeting at three.
Improve English accuracy with context
Provide terminology, names, or custom vocabulary to guide English recognition toward the right words, without retraining models.
Know when the speaker is finished
Soniox detects when a English speaker has actually completed their thought, not just when they pause.
Know who said what in English
Soniox separates English speakers in real time, so every word stays connected to the person who said it.
Estimate your English speech-to-text API cost
Choose real-time or async transcription and set your monthly audio volume to estimate your Soniox API cost.
Pricing calculator
English speech-to-text API pricing
1,000 hours of audio / month
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
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
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.
"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
English speech-to-text use cases
Soniox is built for English voice applications where accuracy, latency, and reliability matter at scale.
Voice agents
Streaming English recognition that knows when the speaker has finished, so agents reply at the right moment.
Voice dictation
Real-time English dictation that writes names, numbers, and codes exactly as spoken.
Meeting notes
English meeting transcripts with speaker labels and timestamps, ready for summaries.
Call center
Real-time transcription, agent assist, and searchable records for every English customer interaction.
Medical transcription
Transcription of English clinical speech, including specialist terminology and patient documentation.
Speech translation
Real-time or async translation of spoken English into 60+ languages.
Start transcribing English speech from $0.10 per hour of audio.
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.
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.
Also for English: English text-to-speech API for voice output, and the English voice AI platform for enterprise deployment.
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.
Frequently asked questions
Does Soniox support real-time speech-to-text for English?
How accurate is Soniox for English?
How much does the English speech-to-text API cost?
Which SDKs can I use?
Can Soniox handle mixed-language speech involving English?
Does Soniox support real-time translation from and to English?
Can Soniox recognize numbers, names, and alphanumerics in English?
Does Soniox support speaker diarization in English?
Can I improve accuracy for domain-specific English audio?
Where is English speech data processed, and is it used for training?
Is Soniox ready for production English workloads?
How do I get started?
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Pricing details