The latest articles on DEV Community by Divyanshu Patel (@divyanshu_patel_). https://dev.to/divyanshu_patel_ https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4019466%2F3ffcedd9-1221-4642-b248-c3eb6714ab39.png https://dev.to/divyanshu_patel_ en Divyanshu Patel Tue, 07 Jul 2026 11:55:20 +0000 https://dev.to/divyanshu_patel_/i-built-syncbuds-synchronized-audio-across-phones-with-no-backend-54i3 https://dev.to/divyanshu_patel_/i-built-syncbuds-synchronized-audio-across-phones-with-no-backend-54i3 <h1> I Built SyncBuds: Synchronized Audio Across Phones with No Backend 🎧 </h1> <p>What if friends could listen to the same audio together, perfectly synchronized, while each person uses their own phone and earbuds?</p> <p>That’s <strong>SyncBuds</strong>.</p> <p>📱 One phone hosts a room<br> 📶 Friends join over WiFi or hotspot<br> 🎧 Everyone listens through their own earbuds<br> 🚫 No backend, accounts, or internet required</p> <h2> How it works </h2> <p>The host phone acts as the server and clock master.</p> <p>Under the hood, SyncBuds uses:</p> <ul> <li>mDNS for room discovery</li> <li>TCP for control messages</li> <li>NTP-style clock synchronization</li> <li>UDP for real-time audio streaming</li> <li>Native Android audio playback</li> <li>Jitter buffering and drift correction</li> </ul> <p>The hardest challenge is keeping different phones synchronized despite network jitter and device-specific audio latency.</p> <h2> What works today </h2> <p>✅ Room hosting and discovery<br> ✅ QR/code joining<br> ✅ Real clock synchronization<br> ✅ Host-to-guest audio streaming<br> ✅ Synchronized play/pause<br> ✅ Latency calibration<br> ✅ Auto-reconnect</p> <p>SyncBuds is still early and completely open source. I’m looking for testers and developers interested in Android audio, networking, Flutter, or DSP.</p> <p>⭐ GitHub: <a href="https://github.com/divyanshupatel17/syncbuds" rel="noopener noreferrer">https://github.com/divyanshupatel17/syncbuds</a></p> <p>Feedback and contributions are welcome! 🚀</p> music wifi productivity opensource