English to Czech speech-to-text translation API

Stream English (English) speech and get Czech (Čeština) back in real time. One WebSocket, ISO codes en to cs, and ultra-low latency for voice agents and live apps.

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Production-ready English to Czech translation API

Real English speech includes accents, regional dialects, code switching, and domain-specific vocabulary. Soniox recognizes it in a single model and streams Czech while the speaker is still talking.

English (Indo-European > Germanic > West Germanic) and Czech (Indo-European > Slavic > West Slavic) come from different language families, so word order and morphology differ. Soniox reorders meaning in-stream instead of word by word.

Soniox preserves formatting in the translated transcript, including names, numbers, addresses, IDs, and domain-specific terms.

Real-time English to Czech translation

Soniox streams the English transcript and the Czech translation on the same connection, word by word, so meaning lands while the speaker is still talking.

Live Transcription

EnglishTranscript

CzechTranslation

One-way translation

Translate live English into Czech. Everyone in the conversation sees the same translated stream.

YouTube

Two-way English and Czech conversation

Each side speaks naturally and hears the other in their own language. Use it for live interpreters, bilingual voice agents, travel assistants, and customer support.

Live Conversation

English

English and Czech through a single stream

Set the source and target codes once. Transcript and translation arrive interleaved on one labeled token stream, with no extra round trip.

config.json

{
  "model": "stt-rt-v5",
  "translation": {
    "type": "one_way",
    "source_language": "en",
    "target_language": "cs"
  }
}

A breakthrough in real-time English to Czech translation

Translate before the sentence ends

Czech meaning lands as English is spoken, not after the caption catches up.

Directional en to cs streaming

Set the source and target codes once. Both arrive in a single labeled token stream.

Native-speaker English STT accuracy

Accurate Czech translation starts with accurate English recognition across accents and language switching.

Names, numbers, and domain terms

Preserved across the pair, including phone numbers, emails, and IDs.

English to Czech translation is built on top of the Soniox Speech-to-Text API. Turn it on by adding a translation block to your request.

Explore the translation docs

Estimate your English to Czech translation cost

Set your monthly audio volume to estimate your Soniox API cost for real-time speech-to-text translation.

Pricing calculator

Stop overpaying for English speech AI

Sonioxvs

1,000 hours of audio / month

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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.

Translate English to any language

From English to Czech, or English to any of 60+ supported languages. All real-time.

Frequently asked questions

How do I translate English to Czech with the API?

Add a translation block to your real-time request with source_language "en" and target_language "cs". Soniox transcribes English and streams the Czech translation over the same WebSocket.

Is English to Czech translation real-time?

Yes. Soniox streams Czech while English is still being spoken, so meaning arrives mid-sentence instead of after the sentence ends.

What about translating Czech to English?

That direction is supported too. See the Czech to English page, or use two-way translation to run both directions in one session.

Does Soniox handle English dialects and accents?

Yes. Soniox handles English dialects like American English, British English, and Australian English in a single model, so Czech translation stays accurate across regions.

Which other providers support English to Czech?

Based on their public docs, OpenAI, Azure, and Speechmatics list both English and Czech for real-time translation. Soniox is the only one that also supports two-way live translation across 60+ languages.

How fast is English to Czech translation?

Soniox streams Czech as English is being spoken, with ultra-low latency. Translation arrives before the sentence ends.

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Documentation

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See what you’ll pay

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Pricing details