Audio Player with "Binaural Beats" tuned to the same key as your music
Hi HN, Gabriel here. This is a standalone binaural beat generator, combined with a two-deck local audio player built with the Web Audio API. It includes ten harmonic carrier pairs, seven brainwave-state presets, per-harmonic mixing (so the binaural tones aren't out-of-tune with the music), adjustable beat and carrier frequencies, two oscillator shapes, offline key/BPM analysis, automatic carrier matching, adaptive impulse noise, playlist support, and output recording. The main problem I've had with existing "binaural beat" generators is that the tone generated does not remain in-tune…
In plain words
This is a web-based audio player that generates binaural beats tuned to match the key and tempo of the music being played. Built with the Web Audio API, it features a two-deck mixer, seven brainwave-state presets, adjustable frequencies, and per-harmonic mixing to keep binaural tones harmonically aligned with the music. It includes playlist support, offline key and BPM analysis, automatic carrier matching, and output recording. The tool is designed for music listeners who want to combine binaural beat therapy with their own audio library without the tones sounding out of tune.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hi HN, Gabriel here. This is a standalone binaural beat generator, combined with a two-deck local audio player built with the Web Audio API. It includes ten harmonic carrier pairs, seven brainwave-state presets, per-harmonic mixing (so the binaural tones aren't out-of-tune with the music), adjustable beat and carrier frequencies, two oscillator shapes, offline key/BPM analysis, automatic carrier matching, adaptive impulse noise, playlist support, and output recording. The main problem I've had with existing "binaural beat" generators is that the tone generated does not remain in-tune with what I'm listening to. This becomes highly noticeable, kind of ruining both the binaural beat and the music ("wrong, Marge, two perfectly good jackets!"). That's the issue this solves, and then I added a bunch of nice-to-haves on top. It's open-source, free, etc - I'm just sharing because it's something I wanted to exist, and maybe others want it to exist too. Some of you might remember i-Doser, and have - like me - been looking for that same high ever since. That (urban-legend-coded, totally-trippy-if-you're-fifteen-years-old) app introduced me to "Binaural Beats" - where you play two different tones in each of a person's ears, and the brain scrambles the different frequencies into a single frequency. As I understand it, this is meant to induce specific brainwaves in the listener, which replicate states like "deep focus" or "half-asleep" or "meditating". I've not decided personally if this is real science, or new-age pseudoscientific nonsense. It's probably somewhere between the two. I intentionally haven't looked that hard into studies on the actual effects, because I think placebo is very powerful, and binaural beats work great on me. I find them genuinely useful for focus, meditation, and dream-state creativity. I figure: If it ain't broke, don't learn that it's a placebo. YMMV. I really love ambient music, and I think that audiobooks could be a much more interesting form if they borrowed more from ideas found in ambient music. That's why I put a second deck on it for spoken-word files. There's some ASMR-y stuff like impulse noise available, also, for those good-good tingles. I'd like to build it out into a more fully-featured "ambient spoken word" DJ software UI, for making stuff inspired by and adjacent to Glenn Gould's The Idea of North, and I guess this is currently about halfway to that thus far. The playlist function allows you to predefine the binaural tone against tracks playing in the future, so you can set up some pieces of music, and define the brain frequency you are trying to induce (or placebo) in yourself. I've had a lot of fun putting albums into this, and taking journeys from - for example - "focus" to "deep sleep". I strongly recommend Sea Power's Disco Elysium OST for that, which I've revisited a few times in this software already. I can't attest to whether the opposite directional journey works, because the "deep sleep" tone has reliably rendered me unconscious. I hope some of you get some of the same enjoyment (or placebo of enjoyment) I'm getting from it. Feedback, ideas of music that might work well in it, and feature-requests appreciated, especially features in the 'this would make me enjoy using it, but I can't be bothered to add it myself' category. Edit: I just realised I could have deployed this as a GH Pages page, so you can use it without any setup at all. Doh! Link to that here - should all work fine in-browser: https://henrygabriels.github.io/binaural-studio/
Does the same job
all alternatives →
- BPBeatsync – perfect audio sync across multiple devices2025 · github.com · ▲439
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…
- BMBuilding musical synthesizers with SQL queries2023 · github.com · ▲176
If you already know what bytebeat is, you don't need an explanation. If not, check my project :) Here is how it looks: SELECT mono(output( arraySum(x -> 1 / 6 * running_envelope(30 * (1 + x / 6), time, 0.05 * x, 0.005, lfo(0, 0.25, sine_wave, time / 8), 0.1) * sine_wave(time * 80 * exp2(x / 3)), range(12)))) FROM table; To check how it sounds, find the examples in the repository https://github.com/ClickHouse/NoiSQL
Binaural OnlineJun 2026 · binaural.online · ▲2Free binaural beats generator for focus, sleep & meditation
- BABeats, a web-based drum machineJan 2026 · beats.lasagna.pizza · ▲160
Hello all! I've been an avid fan of Pocket Operators by Teenage Engineering since I found out about them. I even own an EP-133 K.O. II today, which I love. A couple of months ago, Reddit user andiam03 shared a Google Sheet with some drum patterns [1]. I thought it was a very cool way to share and understand beats. During the weekend I coded a basic version of this app I am sharing today. I iterated over it in my free time, and yesterday I felt like I had a pretty good version to share with y'all. It's not meant to be a sequencer but rather a way to experiment with beats and basic sounds,…
- IMI made a generative online drum machine with ClojureScriptSep 2025 · dopeloop.ai · ▲202
After two years of development, I'm super excited to release Beat Maker! This is my take on what I hope is the best free, web-based drum machine. My goal was to build something that was not only fun and easy to use for beginners but also powerful enough for serious producers. I did extensive research on existing drum machines, analyzed their UX, and tried to build something that adds something new. It's a nearly 100% client-side app, written in ClojureScript, and is a PWA so you can install it to your home screen for an app-like experience. Besides the standard grid editor, Beat Maker has…
More dev tools this month
the category →
The first open-source price index for GPU compute
Dev tools · 10d ago · getcomputable.com
OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.
Dev tools · 2d ago · opentrailpaper.com
Open-source GTM skills for technical founders
Dev tools · 29d ago · gtmcofounder.com
Launched alongside, July 2026
the whole month →- IR
I might be the only SRE on Earth with his own bowling center. It's a more in-depth gig than you'd think. My family and I bought an abandoned 8-lane bowling center in the rural mid-west. In our small town there weren't many recreation options for families. You've heard of a food desert? This is an R&R desert. It had been abandoned for a good reason. The roof leaks, the electrical system was constantly surging, and my 70-year-old bowling equipment (still) doesn't work perfectly. The system that keeps your score is particularly interesting to me. It's the thing you watch during your game, but…
Life & fun · Jul 2026
- EElevators▲1,680
Life & fun · Jul 2026 · john.fun
- 1W18 Words▲1,160
Life & fun · Jul 2026 · 18words.com
- BA
Over the past few months, our team has been building more and more slidedecks using web frontend technologies with coding harnesses like Claude Code, but a common complaint is to make even small edits we need to edit the code either manually or via the harness. To avoid this loop, I ended up creating Bento, a single HTML file with everything you need in a slide tool including animations and shared editing. There's no install or cloud login, everything works offline. The default deck is around 560 KB and it doesn't need to fetch anything once you got it. Open it in a browser and then you can…
Dev tools · Jul 2026 · bento.page
- GG
A few days ago I found myself trying out GLM 5.2 and was really positively impressed. The capabilities and security I was getting from this LLM are similar to those I've gotten from models like Claude or GPT, and this really surprised me. But then I thought, "I wonder how it would work on a normal computer like mine," and above all, "I wonder if it would work without going into OOM on a computer like mine." So I started working with the help of agents to test this possibility. I started converting the model to int4, understanding MTP usage, and if possible implementing DSA for long context.…
AI · Jul 2026 · github.com
