Reference Comparer
Compare your mix against a reference track. Level-matched A/B with spectrum overlay and detailed metrics.
Your Mix (A)
Drop your mix here
The track you want to check
Reference (B)
Drop reference here
The track you want to match
LUFS-I
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True Peak
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RMS Level
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Stereo Width
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ST-LUFS Max
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Loudness Range
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Crest Factor
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Phase Corr.
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Spectrum Comparison (A=purple, B=green)
Your Mix (A)
Reference (B)
100% local processing — your audio never leaves your device
Analyzing...
100% Private — Your files never leave your device
All audio processing runs entirely in your browser using Web Audio API and WebAssembly. Nothing is uploaded to any server — ever. Your files, your hardware, your privacy.
Completely Free — No limits on usage
Use every tool as often as you want. No sign-up, no accounts, no usage caps, no watermarks. File-size limits are shown in each tool to keep your browser responsive.
Professional Grade — Built by audio engineers
EBU R128-style loudness metering with ITU-R BS.1770 K-weighting and gating, plus True Peak, BPM, key, stereo width and frequency spectrum analysis. True Peak, tempo and key are estimates.
Open Source — See exactly how it works
The original Audio Analyzer is open source under the MIT license. Read the DSP code, fork it, build on it. View on GitHub →