English text-to-speech API
TTS API for real-time English speech generation in voice agents, IVR, and narration. With voice cloning, character-level timestamps, and language mixing between English and 60+ supported languages.
$0.70/hour of generated audio
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Trusted by teams building global voice products
English speech synthesis 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, IVR, or narration product speaks to them, text-to-speech has to get the details right: phone numbers and codes read exactly as written, names pronounced the way English speakers expect, and text that mixes English with other languages spoken in one voice.
Soniox TTS generates English speech over a real-time WebSocket, starting audio from the first few words, or with a single REST request, through one multilingual API built for 60+ languages. Every voice speaks English, you can clone your own voice, mix languages in one sentence, and get character-level timestamps.
Exceptional quality in English
Hear the same voice deliver natural, expressive speech in English and across 60+ languages with consistent quality, identity, and pronunciation.
Hallucination-free English speech generation
The English text you send is exactly what gets spoken. No invented words, dropped content, or unexpected substitutions.
Your appointment is confirmed for 9:45 AM on June 3.
Your appointment is confirmed for 9:45 AM on June 3.
Alphanumerics spoken correctly in English
Email addresses, phone numbers, addresses, IDs, and codes spoken clearly and precisely in English.
plusonefouronefivefivefivefivezeroonethreetwo
Names pronounced naturally in English
Handle person names, place names, brand names, and borrowed words with the pronunciation English speakers expect.
bee · YON · say
Streaming English speech before the sentence ends
Start generating English speech from the first few words, before the full sentence is available, for low-latency voice agents and live systems.
Absolutely, I can help you change your reservation. What date would work better?
Precise timing for every character
Character-level timestamps let applications synchronize English text and audio, stop cleanly during interruptions, and continue from the correct point.
Seamless language switching with English mid-sentence
Speak mixed-language text naturally in a single utterance, switching between English and other languages with the right flow and pronunciation.
EnglishEstimate your English text-to-speech API cost
Set your monthly generated speech volume to estimate your Soniox API cost for text-to-speech.
Pricing calculator
English text-to-speech API pricing
1,000 hours of speech / 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 text-to-speech use cases
Soniox TTS is built for English voice applications where latency, accuracy, and reliability matter as much as voice quality.
Voice agents
Streaming English replies that start before the LLM finishes and stop cleanly when the user interrupts.
Enterprise IVR and customer support
Read English account data, verification codes, and addresses exactly as written, at scale.
Multilingual communication
Speak English mixed with other languages in one voice, with foreign names pronounced correctly.
Accessibility and assistive voice tools
Dependable English voice output for reading assistants and communication tools.
Media and content production
English narration and audio content at scale, with names and technical terms pronounced correctly.
Video voiceover
English voiceovers for product, training, and marketing videos, in a built-in or cloned voice.
Start generating English speech from $0.70 per hour of generated audio.
Go global with one API
Get production-ready text-to-speech in 60+ languages.
Also for English: English speech-to-text API for voice input, 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 text-to-speech for English?
How natural does Soniox sound in English?
How much does the English text-to-speech API cost?
Which TTS model does Soniox use for English?
tts-rt-v2, one model for all 60+ supported languages. See TTS models.Which SDKs can I use?
Can I clone a voice for English?
How does Soniox TTS handle alphanumerics in English?
Can Soniox TTS handle mixed-language text with English?
How does Soniox TTS pronounce names and foreign words in English?
Is Soniox TTS fast enough for real-time English voice agents?
Where is English speech data processed, and is it used for training?
Is Soniox TTS ready for production English workloads?
How do I get started?
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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Pay only for what you use with our flexible pricing. Built to scale with you.
Pricing details