Real-Time Translation API for Live Streams
StreamTranslate provides real-time translated subtitles via browser source URL — essentially an API for live translation that integrates with any streaming software.
Try Free — 60 Seconds to Live SubtitlesLast updated: April 2026
For Developers
StreamTranslate's translation pipeline processes audio in real time: WebSocket audio streaming to Deepgram for speech-to-text, multi-provider translation engines for accuracy, and Socket.io for sub-2-second subtitle delivery. The output is a browser source URL that renders translated captions — no custom integration code required.
Technical Architecture
StreamTranslate's real-time translation pipeline is designed for low latency and high reliability on live streams:
Integration: How to Use StreamTranslate
StreamTranslate is designed to work without custom API integration code. The browser source URL is the integration point:
// 2. Configure source + display language
// 3. Copy the browser source URL
// 4. Add as Browser Source in OBS (1920x1080)
Browser Source URL format:
https://streamtranslate.live/overlay?session=YOUR_SESSION_ID&lang=es
The browser source URL connects via Socket.io and renders translated captions in real time. It works with any software that supports browser sources: OBS, Streamlabs, XSplit, vMix, and more.
Technical Specifications
| Spec | Details |
|---|---|
| Audio input | WebSocket (raw PCM, browser Web Audio API) |
| STT engine | Deepgram (real-time streaming) |
| Translation | Multi-provider (optimized per language pair) |
| Delivery | Socket.io (real-time push) |
| End-to-end latency | Under 2 seconds |
| Languages | 28 supported languages |
| Output format | Browser source URL (HTML/CSS overlay) |
| Compatible software | OBS, Streamlabs, XSplit, vMix, any browser source |
Live Streaming Market Stats
The technical demand for real-time translation infrastructure is driven by massive global streaming audiences.
Pricing for Developers & Integrators
StreamTranslate uses simple flat pricing — no per-API-call billing, no usage metering:
- Stream Pass: $9.99 — 24-hour access for testing or one-off events
- Starter: $14.99/mo — for regular integration use
- Pro: $34.99/mo — dual-language output, advanced customization
- Unlimited: $79.99/mo — all 30+ languages, maximum throughput
Frequently Asked Questions
Does StreamTranslate have an API for real-time translation?
StreamTranslate provides real-time translated subtitles via a browser source URL that integrates with any streaming software. Under the hood, it uses WebSocket audio streaming to Deepgram for speech-to-text, multi-provider translation engines, and Socket.io for real-time subtitle delivery.
How does StreamTranslate's translation pipeline work technically?
Audio is streamed via WebSocket to Deepgram's speech-to-text engine. The transcript is then routed through multiple translation providers for optimal quality. Translated text is delivered back to the client via Socket.io in real time — under 2-second end-to-end latency.
Can I integrate StreamTranslate with custom streaming setups?
Yes. StreamTranslate outputs a standard browser source URL that works with OBS, Streamlabs, XSplit, vMix, and any software that supports browser sources. The URL renders translated captions as an overlay — no custom API integration code required.
What speech-to-text engine does StreamTranslate use?
StreamTranslate uses Deepgram for speech-to-text transcription, chosen for its low latency, high accuracy on live audio, and support for 30+ languages. Translation is handled by multiple providers to ensure quality across language pairs.
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