The Audio Stuff Tools VS https://open-gpt.app/

The Audio Stuff Tools's answer

Most audio calculators online solve exactly one problem and live on a different site each time. This is sixteen of them in one place, covering the whole chain: your ears, the file, the amplifier, the room and the cables.

Two of them do things that are hard to find for free anywhere else. The ABX blind test runs a proper level matched A/B/X comparison in the browser, so you can settle for yourself whether you can hear a difference before you pay for one. The hi-res checker runs an FFT spectrogram over a FLAC and shows where the real content stops, which is how an upsampled 16 bit file wearing a 24 bit price tag gives itself away.

The other difference is who built them. They come from a working review site, so the assumptions behind each calculator are the same ones used in published measurements and verdicts, not generic formulas copied from a textbook.

The Audio Stuff Tools's answer

Three reasons.

The maths is out in the open. Every calculator states its inputs, its assumptions and what the number actually means for your setup, so you can disagree with it in an informed way instead of trusting a black box.

Nothing you load leaves your machine. Audio is decoded and analyzed in the browser with the Web Audio API. The analysis code makes no network calls at all, so a file you drop into the ABX test or the hi-res checker is never uploaded, never stored and never seen by us.

The recommendations are anchored to real testing. The gear finder draws on The Audio Stuff scored reviews, where every product gets a minimum two week listening period and is compared against a published reference list. It is not an affiliate feed sorted by commission.

On top of that it is free with no account, and the sixteen tools are consistent with each other, so a figure you get out of the speaker wattage calculator lines up with what the SPL and room mode tools tell you.

The Audio Stuff Tools's answer

People who already care about sound and have hit one specific question.

Headphone owners working out whether an amplifier will actually drive a 300 ohm pair, or whether the one they own is running out of headroom. Anyone setting up speakers in a real room who wants to know why the bass is uneven at the sofa and how much absorption would fix it. Buyers checking whether a hi-res download is genuinely high resolution before paying the premium. Newcomers who want to find out whether they can hear a difference at all before spending money on one.

It is aimed at enthusiasts and home listening rooms rather than professional studios, and no measurement experience is assumed. If you can read a spec sheet, every tool here will make sense.

The Audio Stuff Tools's answer

The tools grew out of The Audio Stuff, an independent review site started by Jakub Charkiewicz in May 2023. It exists because most audio reviews do not say what they mean: vague adjectives, recycled marketing copy and verdicts shaped by who is buying the ads. The answer was a slower process, with a minimum two week listening period, head to head comparisons against a published reference list, and honest negative reviews even when the unit arrived free.

The same handful of questions kept coming back under review after review. Will this amplifier drive these headphones. Is this hi-res file actually hi-res. Why does my room do that to the bass. Can I even hear the difference people are arguing about.

Answering those one at a time in comments did not scale, so each answer got turned into a calculator or a test that anyone could run themselves. Sixteen of them later, it became its own section of the site, free and open to everyone rather than a subscriber perk.

The Audio Stuff Tools's answer

Plain client side web technology, deliberately no framework.

• Vanilla JavaScript ES modules. Each tool is its own small module, loaded only on its own page, so nothing carries the weight of the other fifteen.
• Static site. Pages and hashed CSS and JS bundles are served as static files, with no application server behind the tools.
• Web Audio API. AudioContext, decodeAudioData and AnalyserNode handle playback, level matching and spectrum analysis for the ABX test, tone generator, equalizer and hi-res checker.
• Web Workers. FFT analysis runs off the main thread so the interface stays responsive while a long file is being processed.
• Canvas 2D and inline SVG. Spectrograms, room mode maps, absorption curves and EQ plots are drawn directly rather than pulled in as chart library images.

There is no backend for the tools themselves and no analytics inside them. The analysis modules make no network requests, which is what makes the privacy claim verifiable: open the network tab while you run a test and nothing goes out.