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    Free, in your browser - pro-grade

    Free audiophile & sound engineering tools

    Twelve 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. Headphone amplifier power, speaker amplifier power, SPL at distance, room mode prediction, ABX blind testing, Golden Ear training, real-time signal generation, hi-res audio fraud detection, speaker cable gauge calculation, RCA capacitance roll-off, bit-depth loss from digital volume control, and WHO-compliant safe listening duration.

    Every tool here runs entirely in your browser via the Web Audio API and pure JavaScript. There is 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.

    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. Twelve 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.