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…
Beatsync – perfect audio sync across multiple devices launched on April 29, 2025 with 439 votes, #40 of 7,818 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 1 year on.
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
🔊 High-precision web player for multi-device audio playback and spatial audio. - freeman-jiang/beatsync
Beatsync is a high-precision web audio player built for multi-device playback. The official app is beatsync.gg . Beatsync is in early development. Mobile support is working, but experimental. Please consider creating an issue or contributing with a PR if you run into problems! bun install # installs once for all workspaces bun dev # starts both client (:3000) and server (:8080) Directory Purpose apps/server Bun HTTP + WebSocket server apps/client Next.js frontend with Tailwind & Shadcn/ui packages/shared Type-safe schemas and functions shared between client & server About 🔊 High-precision web player for multi-device audio playback and spatialfrom github.com
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.…
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