Load two files side by side to compare their waveforms and technical stats at a glance — handy for checking an original against a compressed or edited version.
The Audio Two-Files Comparator shows how two recordings differ — in loudness, dynamics, brightness, spectral balance, length and more — and lets you listen to them at matched loudness. Compare a mix before and after mastering, a WAV and its MP3, two microphones, two compressors or two different masters.
A null test subtracts one file from the other: if the result is silent they are identical; the residual level tells you how different they really are.
Both files are measured with the BS.1770-4 loudness algorithm, true-peak and crest factor; the long-term average spectrum gives spectral centroid, 85% roll-off and energy per band (sub-bass to brilliance). The loudness-matched version of B is B scaled by the difference in integrated LUFS, so both measure the same. For the null test (when sample rate, channels and length match within 0.05%) the tool computes 10·log₁₀(Σ(A−B)² ÷ ΣA²).
Hear the real improvement, not just louder.
Compare two recordings of the same source.
Null-test WAV vs MP3.
Compare your mix to a commercial track.
| Metrics | Loudness, LRA, true peak, crest, centroid, roll-off, band energy |
|---|---|
| Null test | When format and length match |
| Fair listening | Loudness-matched B tab |
Subtract (or phase-invert and mix) two files; whatever remains is the difference.
Humans prefer the louder of two otherwise identical sounds.
Checking how much a compression or format-conversion pass changed a file's size and bitrate, or visually comparing two takes of the same recording.
Not automatically — it shows you the measured stats and waveforms for both files so you can compare them yourself; it doesn't compute a single 'similarity score'.
This tool runs entirely in your browser using the Web Audio API. Nothing is uploaded, stored or shared — there is no server to send your file to, so it works offline once the page has loaded.
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