SoundWall App Syncs Multiple Smartphones to Play Audio Simultaneously

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A developer named Konstantinos has built a side project called SoundWall, a web app that synchronizes multiple smartphones to play the same audio at the same time. The tool uses WebRTC for timing synchronization and is built as a Progressive Web App, making it installable and capable of working offline. The sync logic runs entirely on the client side, requiring minimal backend infrastructure. SoundWall is aimed at casual use cases such as outdoor gatherings or small parties where Bluetooth speakers are unavailable. The developer has shared the project on DEV Community and is seeking feedback on WebRTC synchronization strategies, timing optimization, and PWA best practices.

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