How It Works

Train Like a Pro,
Perform Like One

Simultalive replicates real booth conditions using AI-powered speech recognition and real-time translation feedback — so you can practice anywhere.

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The 5-Step Process

01

Set Up Your Microphone

Simultalive uses your browser's native audio APIs to access your microphone. No plugins, no downloads required. We check your microphone quality and display a real-time volume meter so you know exactly what the AI is hearing. You can test with the monitor feature to hear yourself in your headphones, just like a real booth.

02

Choose Your Language Pair

Select a source language (the language you'll be listening to) and a target language (the language you'll be interpreting into). We support 5 source languages and 11 target languages, powered by Deepgram's Nova-3 model — one of the most accurate real-time speech recognition systems available.

03

Watch the Video, Speak Your Interpretation

A professional video in your source language plays automatically. Your job is to interpret everything you hear into your target language, in real time — just like in a professional setting. Your microphone records your interpretation in 250ms chunks, streaming audio continuously to our backend for real-time speech processing.

04

AI Transcribes and Analyzes in Real Time

Your audio is processed by Deepgram in milliseconds. The transcript panel shows interim text (grey, still being processed) and final text (confirmed words) as you speak. Meanwhile the original video's speech is also being translated so you can see the reference translation — helping you self-correct in real time.

05

Get Your Score and Detailed Feedback

When your session ends, request an AI-powered score. Our system compares your interpretation against the reference transcript and scores you across accuracy, fluency, terminology, and completeness. You'll receive a score out of 100, a list of strengths, specific suggestions for improvement, and a side-by-side transcript comparison.

Built on Professional Technology

The same tools used by leading translation companies, now in your browser.

Deepgram Nova-3

Industry-leading speech-to-text with sub-200ms latency, supporting 30+ languages.

WebSocket Streaming

Persistent real-time connection so audio reaches our servers with no batching delays.

AI Scoring Engine

GPT-powered comparison of your interpretation versus the reference transcript.

Common Questions

Do I need to install anything?
No. Simultalive runs entirely in your browser using the WebAudio and MediaRecorder APIs built into modern browsers (Chrome, Edge, Firefox). No extensions or software needed.
What microphone should I use?
Any USB microphone or headset will work. Professional condenser microphones (like the Blue Yeti or Audio-Technica AT2020) will give the best speech recognition results, but a basic headset mic is sufficient to start.
Are my recordings stored?
Yes — your interpretation transcripts are stored so you can review them later and request scores. Audio is processed in real-time and not stored in raw form. You can delete your history at any time.
How is the score calculated?
Our AI compares your output transcript to the reference translation segment by segment, evaluating accuracy (did you convey the right meaning?), fluency (natural language flow), terminology (correct specialized terms), and completeness (did you miss anything?).
Can I practice without an internet connection?
No — real-time speech recognition and AI scoring both require a live connection to our backend servers.

Ready to Start?

Create a free account and complete your first session in under 5 minutes.

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