Build ChatGPT Voice Chat in React Native & Expo

Talking to ChatGPT with almost no delay feels like a phone call, not a chatbot. OpenAI's realtime API makes true speech-to-speech conversations possible, and I built the whole thing in React Native and Expo. I even got two AI voices to talk to each other.

If you want AI voice in your app, I walk through every piece in the video, tested on iOS.

What's inside

• Start a call and get a response in about a second
• Interrupt the AI mid-sentence: it stops and listens
• Long-press to switch between six preset voices
• Keep credentials safe with an Expo Router API route
• What Expo SDK 53 adds, including Expo Mesh Gradient on iOS

Resources

CourseReact Native course

The API route pattern behind this app, explained in Backend Basics: 55 minutes on routes and streaming.