PhoneSpeaker 📡

Stream your laptop's audio to your phone's speaker over WiFi — no cables, no Bluetooth pairing.

How it works

• Your laptop captures its own audio output (tab or system audio)
• Streams it in real time to your phone via WebRTC (peer-to-peer, low latency)
• Your phone plays it through its speaker

Setup

1. Install dependencies

npm install

2. Start the server

npm start

Server runs on http://localhost:3000

3. On your laptop

• Open http://localhost:3000 in Chrome/Edge
• Select Laptop (Host)
• Click Create room & share audio
• In the browser dialog: choose the tab or screen you want to share, and make sure to tick "Share audio" / "Share tab audio"
• A 4-character room code appears (e.g. AB3X)

4. On your phone

• Connect your phone to the same WiFi network as your laptop
• Find your laptop's local IP (run ipconfig on Windows or ifconfig on Mac/Linux)
• Open http://YOUR_LAPTOP_IP:3000 on your phone's browser
• Select Phone (Speaker)
• Enter the room code
• Tap Connect as speaker → audio plays through your phone!

Tips

• Use Chrome or Edge for best WebRTC support
• For system-wide audio capture (all apps, not just one tab), use the "Entire screen" option and tick "Share system audio" on Windows
• On Mac, system audio capture requires a virtual audio driver like BlackHole
• Multiple phones can connect to the same room — all play simultaneously
• Adjust volume independently on each phone with the volume slider

Tech stack

• Node.js + Express — web server
• Socket.io — WebRTC signaling (offer/answer/ICE)
• WebRTC — peer-to-peer audio streaming
• getDisplayMedia API — captures tab/system audio on the host