Aria — AI English Tutor

A real-time voice chat app that teaches English through natural spoken conversation, powered by the Gemini 2.5 Flash Native Audio Live API.

Speak into your microphone and Aria, your AI English tutor, responds with voice in real time. No separate speech-to-text or text-to-speech — Gemini handles everything natively.

Prerequisites

• Node.js 18+
• Gemini API key — get one free at https://aistudio.google.com

Setup

npm install

Run

GEMINI_API_KEY=your_api_key_here npm start

Then open http://localhost:3000 in your browser.

Usage

1. Click Start Session
2. Allow microphone access when prompted
3. Start speaking — Aria will respond in real time
4. Click Stop to end the session

Important Notes

• Use headphones to prevent echo/audio feedback
• The app uses the gemini-2.5-flash-native-audio-preview-12-2025 model with the Aoede voice
• Audio is streamed bidirectionally over WebSocket — your voice goes to Gemini and Aria's voice comes back in real time
• Barge-in is supported: you can interrupt Aria mid-sentence and she'll adapt