Gapless.js – gapless web audio playback
Hey HN, I just released v4 of my gapless playback library that I first built in 2017 for https://relisten.net. We stream concert recordings, where gapless playback is paramount. It's built from scratch, backed by a rigid state machine (the sole dependency is xstate) and is already running in production over at Relisten. The way it works is by preloading future tracks as raw buffers and scheduling them via the web audio API. It seamlessly transitions between HTML5 and web audio. We've used this technique for the last 9 years and it works fairly well. Occasionally it will blip…
Gapless.js – gapless web audio playback launched on March 2, 2026 with 35 votes, #759 of 23,380 launches that month and more than 95% of that year's launches.
In plain words
Gapless.js is a web audio playback library that eliminates silence between tracks during streaming. Built for developers playing consecutive audio files, such as concert recordings, it preloads upcoming tracks as buffers and schedules them via the web audio API. The library uses a state machine architecture with minimal dependencies and seamlessly transitions between HTML5 and web audio playback. It is production-tested and includes fallback support for mobile browsers with limited web audio capabilities.
written from the facts on this page · September 2026
From the sources
Gapless audio playback javascript plugin (for seamless audio playback) - RelistenNet/gapless.js
In the maker’s words, at launch
Hey HN, I just released v4 of my gapless playback library that I first built in 2017 for https://relisten.net. We stream concert recordings, where gapless playback is paramount. It's built from scratch, backed by a rigid state machine (the sole dependency is xstate) and is already running in production over…
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