Beatsync – perfect audio sync across multiple devices
Hi HN! I made Beatsync, an open-source browser-based audio player that syncs audio with millisecond-level accuracy across many devices. Try it live right now: https://www.beatsync.gg/ The idea is that with no additional hardware, you can turn any group of devices into a full surround sound system. MacBook speakers are particularly good. Inspired by Network Time Protocol (NTP), I do clock synchronization over websockets and use the Web Audio API to keep audio latency under a few ms. You can also drag devices around a virtual grid to simulate spatial audio — it changes the…
In plain words
Beatsync is an open-source browser-based audio player that synchronizes playback across multiple devices with millisecond-level accuracy. Using clock synchronization over websockets and the Web Audio API, it allows users to combine any group of devices into a surround sound system without additional hardware. The player includes a spatial audio feature that lets users arrange devices on a virtual grid, automatically adjusting volume based on distance from a listening point to simulate directional sound.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hi HN! I made Beatsync, an open-source browser-based audio player that syncs audio with millisecond-level accuracy across many devices. Try it live right now: https://www.beatsync.gg/ The idea is that with no additional hardware, you can turn any group of devices into a full surround sound system. MacBook speakers are particularly good. Inspired by Network Time Protocol (NTP), I do clock synchronization over websockets and use the Web Audio API to keep audio latency under a few ms. You can also drag devices around a virtual grid to simulate spatial audio — it changes the volume of each device depending on its distance to a virtual listening source! I've been working on this project for the past couple of weeks. Would love to hear your thoughts and ideas!
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