Sixteen free browser tools for audio: blind ABX testing, an FFT check that catches fake hi-res files, room mode and acoustic panel calculators, amp power matching for headphones and speakers, cable maths and ear training. No account, no install.
A startup from Poland that is founded by Jakub Charkiewicz.
This page is designed to help you find out whether The Audio Stuff Tools is good and if it is the right choice for you.
The Audio Stuff Tools is a set of sixteen calculators and analyzers for the questions that come up between deciding you want better sound and actually getting it.
Trust your ears, not the marketing. Run a level matched ABX blind test on two files and find out whether you can actually tell them apart. Train yourself to name a frequency by ear anywhere from 20 Hz to 22 kHz. Take a blind quiz that maps your tonal preference to a sound signature.
Check the file before you pay for it. An FFT spectrogram shows where the real content in a FLAC stops, which is how upscaled and fake hi-res releases give themselves away. A bit depth calculator shows what you throw away by turning the volume down in software instead of on the amp.
Match the amplifier to the load. Enter impedance and sensitivity to get the power and headroom a pair of headphones needs. Do the same for speakers from sensitivity, listening distance and room gain, then check the resulting SPL at your seat.
Fix the room, then settle the cable argument. Map standing wave resonances up to 300 Hz in 3D, size porous absorbers by material and thickness, then get resistance and damping factor for a speaker wire run and treble roll off for an interconnect.
Not sure what to buy? Answer four questions and get ranked picks pulled from The Audio Stuff scored reviews.
Built and maintained by The Audio Stuff, an independent review outlet that scores every product against a published reference list and takes no sponsored verdicts.
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ABX Blind Test
Level matched A/B/X comparison of two files, using built in test pairs or your own, with a running score.
EQ Ear Training Game
Identify boosted bands from 20 Hz to 22 kHz, with difficulty that adapts as you improve.
Sound Signature Quiz
Blind A/B listening that maps your tonal preference to a sound signature.
Graphic Equalizer
Ten band EQ with live visualization and preset export.
Safe Headphone Volume Calculator
Safe listening duration from headphone sensitivity and volume setting.
Tone Generator
Sine waves, noise types and frequency sweeps for channel checks and system testing.
FLAC and Hi-Res Audio Checker
FFT spectrogram analysis that exposes upscaled or fake high resolution files.
Bit Depth Calculator
Resolution lost when you attenuate volume in the operating system instead of the analogue domain.
Headphone Power Calculator
Amplifier power and headroom needed for a given impedance and sensitivity.
Speaker Wattage Calculator
Watts per channel from speaker sensitivity, listening distance and room gain.
SPL Distance Calculator
Sound pressure level at the listening seat from speaker specs and distance.
Room Mode Calculator
Standing wave resonances up to 300 Hz, mapped in 3D for several room shapes.
Acoustic Panel Calculator
Absorption coefficients for porous panels across frequency, by material and thickness.
Speaker Wire Gauge Calculator
Resistance, damping factor and signal loss over a given cable run.
Cable Capacitance Calculator
Treble roll off and loading caused by interconnect capacitance.
Gear Finder Quiz
Four questions that return ranked picks drawn from The Audio Stuff's scored reviews.
Data handling
Audio you load is processed on your own device. Nothing is uploaded to a server and nothing is tracked.
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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.
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.
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 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.
Plain client side web technology, deliberately no framework.
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.
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