Real-time translated captions on your live stream as you speak. Under 500ms latency — the closest thing to simultaneous interpretation for streamers.
Get Started FreeSimultaneous translation traditionally means a human interpreter translating speech into another language in real time, with less than a second of delay. StreamTranslate replicates this for live streaming — AI-powered speech recognition and translation deliver captions within 500ms of you speaking.
Unlike pre-recorded subtitles or post-stream transcription, simultaneous translation works during your live broadcast. Your Japanese viewers see the caption at the same moment your English viewers hear your words. There's no delay that breaks immersion, no post-processing step, and no extra work — it runs automatically the entire time you're live.
For streamers, simultaneous translation is the difference between having an international audience that follows every moment versus an audience that watches but misses most of what's happening.
Traditional translation pipelines — transcription → translation → display — take multiple seconds. StreamTranslate achieves sub-500ms by parallelizing steps and running close to real-time on the transcription side:
The result: captions appear within 200–500ms of you speaking. Most viewers perceive this as truly simultaneous — indistinguishable from live translation.
StreamTranslate's dual-language mode shows two languages simultaneously on your stream overlay:
Both languages appear simultaneously — your English viewers read English, your Spanish viewers read Spanish, your Japanese viewers read Japanese — all watching the same stream.
Dual-language mode is available on Pro ($34.99/mo) and Unlimited ($149/mo) plans.
Before AI-powered tools like StreamTranslate, streamers who wanted international audiences had limited options:
StreamTranslate simultaneous translation is the first option that's: real-time, burned into the stream frame, accessible to all viewers with zero viewer-side setup, and affordable for individual streamers.
StreamTranslate supports 65 target languages for simultaneous translation:
StreamTranslate's simultaneous translation works on every major streaming platform:
Simultaneous stream translation is when your spoken words are translated and displayed as captions on your live stream within milliseconds of speaking — the AI equivalent of a live human interpreter.
Viewer-side tools (browser extensions like Stream CC or Voxo) require each viewer to install and enable the extension — most viewers don't. StreamTranslate burns captions into the stream frame so all viewers see them automatically, on any device, without installation.
Under 500ms end-to-end. Most users find it imperceptible — captions appear simultaneously with their speech from a viewer's perspective.
Pro and Unlimited plans support dual-language mode — your source language and one translation displayed simultaneously on stream.
Yes. StreamTranslate works across all stream categories — gaming, chatting, art, cooking, music, and more. The translation runs from your microphone, not your game audio.
Also supports IRL with Moblin and the OBS audio plugin, including home and cloud OBS setups such as IRL Toolkit.
Use an OBS receiver for IRL Pro, Larix Broadcaster, PRISM Live Mobile or TVU Go. Cloud providers may need to install the plugin on your server.
Moblin · Moblin Browser Source · Cloud OBS · IRL Toolkit · OBS Studio · IRL Pro · Larix Broadcaster · PRISM Live Mobile · TVU Go · MediaMTX