Free in your browser, pro-grade

Free audiophile & sound engineering tools

Sixteen professional-grade audio calculators, analyzers, and trainers built for audiophiles, sound engineers, and anyone who wants to understand their gear and listening room more deeply. They cover amplifier power and matching, room acoustics, ABX blind listening tests, ear training, and real-time signal analysis - the full set is below.

Every tool here runs entirely in your browser via the Web Audio API and pure JavaScript. No download, no account, no upload of your audio files, and no tracking - your test files never leave your device. The math is what professional audio software costs hundreds of dollars to do, made free and instant for the people who actually need to know whether a 100-watt amp will drive their HE-R10 or whether that 192 kHz hi-res FLAC is genuinely hi-res or just an upsampled fake.

Your ears & listening

Train your hearing, run blind tests, find your sound, and listen safely. (5 tools)

  • Test

    ABX Blind Test

    Upload two audio files and take a 10-round double-blind test. Level-matched and sample-accurate. Generates a shareable Certificate of Auditory Transparency.

  • Training

    Golden Ear Frequency Training

    Train your ears to identify frequencies from 20Hz to 22kHz. Adaptive difficulty, five training modes, score tracking, and a shareable Golden Ear Rating.

  • Listening test

    Sound Signature Finder

    A blind A/B preference test over royalty-free music. Pick by ear between more or less bass, mids, treble, reverb, dynamics, even-harmonic warmth, and stereo width - then get your signature in plain English.

  • EQ

    Graphic EQ Simulator & Preset Exporter

    A 10-band graphic EQ you can hear in real time over royalty-free music or your own file. Watch the response curve redraw live, then export presets for Equalizer APO, AutoEQ, Wavelet, or Poweramp.

  • Safety

    Safe Listening & SPL Timer

    Enter your headphone sensitivity and volume setting to calculate the exact output SPL. Get WHO-based safe listening duration countdown.

Find your gear

Answer four quick questions for a ranked shortlist, then see it mapped against the whole scored catalogue. (1 tool)

  • Finder

    Help Me Choose: Audio Gear Finder

    Answer four quick questions - category, budget, sound preference, use case - for a ranked shortlist pulled straight from our scored reviews. Then see every product mapped by price against score, your picks highlighted, every dot linking to its review.

Signal & files

Generate test tones, analyse a file, and check what your bits are really doing. (3 tools)

  • Generator

    Audio Signal Generator

    Pure sine waves, white, pink, brown, blue, and violet noise. Frequency sweeps, channel test, and polarity check. No download. Runs entirely in your browser.

  • Analyzer

    Hi-Res Audio Fraud Detector

    Drop any audio file and see its real frequency content via FFT spectrogram. Catches upsampled fakes where a "192kHz" file secretly contains only 44.1kHz content.

  • Calculator

    Digital Volume & Bit-Depth Loss Calculator

    Find out how many bits of audio resolution you lose when lowering digital volume in Windows or macOS. Shows effective bit depth and noise floor rise.

Power & matching

Will it drive it? Size amplifier power, SPL, and headroom before you buy. (3 tools)

  • Calculator

    Headphone Amplifier Power Calculator

    How much amplifier power your headphones need to hit a target listening level. Sensitivity (dB/mW or dB/V), impedance, headroom: required mW, RMS volts, and peak voltage swing.

  • Calculator

    Speaker Amplifier Power Calculator

    How many watts your speakers need at the chair, by sensitivity, distance, room gain, and crest-factor headroom. Inverse-square law done for you.

  • Calculator

    Speaker Loudness & Distance Calculator

    Calculate the exact SPL at any listening distance from your speakers. Enter sensitivity, wattage, and distance. Covers inverse square law and room gain.

Room & acoustics

Tame the room your gear plays in: modes, bass traps, and panel absorption. (2 tools)

  • Visualizer

    Room Mode & Bass Trap Calculator

    Map every standing wave resonance up to 300Hz in your listening room. Canvas visualizer shows nodes and antinodes. Tells you where to sit and where to place bass traps.

  • Calculator

    Acoustic Panel Absorption Calculator

    Plot the absorption coefficient of any porous acoustic panel from 63 Hz to 8 kHz. Thickness, flow resistivity, and air-gap depth into NRC, SAA, and a frequency curve. Presets for Owens Corning 703, Rockwool RW3, GIK 242, Auralex foam.

Cables

Gauge, resistance, and capacitance - what actually changes the sound. (2 tools)

  • Calculator

    Speaker Cable Gauge Calculator

    Calculate speaker cable resistance, system damping factor, and signal loss in dB for any gauge and length. Recommends minimum gauge for your run.

  • Calculator

    RCA & Phono Cable Treble Roll-off Calculator

    Find where high cable capacitance causes treble roll-off with your phono cartridge or line-level source. Shows the -3dB frequency and roll-off curve.

These tools are free forever. If they help you, share them.

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FAQ

About these free audio tools.

What runs in your browser, what does not, and which tool to start with for your problem.

  1. Are these audio tools really free?

    Yes. Sixteen calculators and analyzers, no account, no download, no payment. Every tool runs entirely in your browser using the Web Audio API and pure client-side computation. Your audio files (where uploaded) never leave your device.

  2. Do I need to install anything to use the audio tools?

    No. Every tool is a single web page. Modern browsers (Chrome, Edge, Firefox, Safari, Opera) on desktop and mobile run them out of the box. The signal generator, ABX test, hi-res checker, and frequency trainer all use the standard Web Audio API which is built into every browser.

  3. Are the audio tools accurate enough for real engineering work?

    Yes for measurements that depend on math: power calculations, room mode prediction, cable resistance, capacitance roll-off, SPL falloff with distance. For listening-based tools (ABX, frequency training), accuracy depends on your headphones, output level, and listening environment. The signal generator outputs sample-accurate sine waves and noise via standard Web Audio nodes.

  4. Does the ABX blind test upload my audio files?

    No. The ABX tool processes audio entirely in your browser. Files are decoded into AudioBuffers and never transmitted anywhere. Same for the hi-res fraud detector. The FFT analysis runs on your CPU, your files do not leave your device.

  5. Which audio tool should I start with?

    For matching gear: the headphone & speaker power calculator, then the ABX blind test if you are deciding between two pieces. For room and setup: the room mode calculator and the SPL distance calculator. For training your ears: the Golden Ear frequency trainer. For checking music files: the hi-res audio fraud detector.

  6. Do the audio tools work on phones and tablets?

    Yes. Every tool runs on iOS Safari, Android Chrome, and any modern mobile browser. The Web Audio API is standard everywhere now. The signal generator, ABX test, and ear trainer benefit from a connected DAC and quality headphones rather than phone speakers, but the calculators (power, room mode, cable, SPL, safe listening) work perfectly with the on-screen keyboard.

  7. How accurate are the test-tone frequencies and signal levels?

    Frequencies are sample-accurate. The Web Audio oscillator produces the exact Hz you set, down to the floating-point precision of the browser. Output level depends on your system volume, DAC, and amp gain, which the tool cannot read; for absolute SPL, calibrate once with a measurement microphone or use the safe-listening calculator to translate your volume position into dB SPL at the ear.

  8. Do the tools remember my inputs between visits?

    Most calculators clear their fields on each page load. The math is fast enough that re-entering values is friction-free, and nothing about your gear setup ends up stored on a server. The ABX test, ear trainer, and signal generator hold session state while the tab is open (your score, your tone settings) and reset cleanly when you close the page. No cookies, no localStorage telemetry, no cross-visit tracking.

  9. Can I share a calculation result or test outcome with someone else?

    Yes for the ABX blind test and the Golden Ear trainer. Both generate a shareable Certificate / Rating you can save as an image and post anywhere. For calculators, the inputs are short enough to retype, and the result page URL stays the same so you can describe your numbers in chat without losing context.