Audio Comparison Tool — MFCC, Spectrogram & Waveform
Upload two audio files and DiffALL compares them using the same psychoacoustic features used in speech recognition. See the mel spectrogram difference and the exact second each divergence starts.
Free, no sign-up — your files never leave the comparison.
Drop file here or click to browse
MP3 · WAV · FLAC · AAC · OGG · M4A · OPUS · WMA
Drop file here or click to browse
MP3 · WAV · FLAC · AAC · OGG · M4A · OPUS · WMA
Comparing two different recordings of people talking to see if it's the same person? Use the Voice Comparison tool →
Free to use — no sign-up needed
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API Keys
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What DiffALL measures
MFCC Similarity
Mel-Frequency Cepstral Coefficients capture the timbral fingerprint of a sound — the same features used in speech recognition and music retrieval.
Spectral Centroid
Measures the perceived 'brightness' of each file — detects EQ changes, high-frequency roll-off, and tonal shifts.
RMS Energy
Root Mean Square energy comparison detects loudness normalisation differences, dynamic range compression, and volume automation.
Mel Spectrogram
Side-by-side mel spectrograms and a JET-coloured difference map let you see frequency-over-time divergences visually.
Per-Second Breakdown
MFCC similarity charted second by second — spot the exact moments two audio files diverge.
In-Browser Playback
Play both files directly in the browser alongside their analysis — no download needed.
Supported formats
Use cases
Podcast QA
Compare the raw recording to the edited version to confirm only the intended cuts were made.
Music Mastering
Verify a mastered track against the mix to quantify what the mastering chain changed.
Encoding Tests
Compare a lossless FLAC to an MP3 or AAC encode to measure quality loss at different bitrates.
Restoration QA
Compare a noise-reduced or restored file to the original to hear and measure exactly what the processing removed.
Frequently asked questions
How do I compare two audio files for differences?
Upload any two audio files to DiffALL. It resamples them to a common rate, computes MFCC, spectral centroid, and RMS energy similarity, and displays mel spectrograms with a difference overlay.
What audio formats does DiffALL support?
MP3, WAV, FLAC, AAC, OGG, M4A, Opus, and WMA. Free plan: audio up to 90 seconds and 40 MB. Pro: up to 3 minutes and 100 MB.
What does the MFCC similarity score mean?
MFCC similarity is a correlation coefficient from 0 to 100%. 100% means the timbral content is identical. Scores above 90% suggest the files are perceptually very similar; below 70% indicates significant tonal differences.
Can DiffALL compare audio at different sample rates?
Yes. Both files are resampled to a common rate (capped at 22,050 Hz) before comparison, so sample rate differences don't affect the result.
Ready to compare audio?
Free, no install, no sign-up required for your first comparison.
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