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Professional Acoustic Inspector

Online Audio Spectrum Analyzer & Quality Inspector

Inspect high-resolution STFT spectrograms (Spek palette), detect BPM with variable tempo tracking, compute Camelot harmonic key, and measure LUFS loudness and 4x True Peak. Fully computed in your browser via Web Audio API & Web Workers — zero server uploads, 100% private.

Supported formats: MP3 WAV FLAC AIFF / AIF OGG M4A AAC

STFT Spectrogram & Frequency Ceiling

Inspect the complete spectral energy profile using the proven Spek color gradient. Our browser DSP computes a high-fidelity Short-Time Fourier Transform (STFT) with interactive mouse hover indicating exact Hz and dB values, while calculating the estimated upper frequency ceiling (estimatedCeilingHz) to reveal high-end roll-offs.

  • Direct interactive Spek alternative with zero desktop installation required.
  • Analysis from 20 Hz up to 22.05+ kHz with high-density FFT windows.

LUFS Loudness & True Peak (dBTP)

Measure integrated loudness compliant with ITU-R BS.1770 / EBU R128 standards. Detect genuine inter-sample peaks via 4x oversampling True Peak (dBTP), evaluate Loudness Range (LRA), Crest Factor, and count clipping samples to protect club sound systems against harsh converter distortion.

  • 4x oversampled True Peak detection revealing hidden inter-sample overshoots.
  • Stereo phase correlation metering and mono-compatibility verification.

BPM, Camelot Key & Phrasing

Advanced chromagram and autocorrelation engines detect track tempo with a reliability confidence score and variable tempo drift flagging. Determines the musical scale and Camelot Wheel notation (e.g., 8A, 11B) with compatible neighboring keys, intro/outro bar counts, and 4 automated cue points.

  • Harmonic compatibility ready for Rekordbox, Serato DJ, and Traktor workflows.
  • Identifies tempo drift in tracks with organic rhythm sections or live drums.

100% Client-Side Privacy & SHA-256

Deckmatics analyses and converts your audio on your own machine: the bytes of your music never leave the browser and are never sent to a server. The only traffic your device may generate, and only when you switch it on, is not your audio: the metadata lookup (MusicBrainz and iTunes) once you grant consent, the stem-separation model download when you use that feature, the Google Fonts request, and advertising once you accept third-party cookies. None of those calls carries your music.

  • Zero upload bandwidth consumption when inspecting heavy lossless WAV/FLAC files.
  • Local SHA-256 checksum generation for track deduplication and integrity audits.

Real-World DJ Use Cases: When & Why to Inspect Tracks

Proven quality assurance routines for your DJ music library before performing live.

Case 1 · Quality Audit

Spotting Lossy Transcode Hints

Inspect whether a promo labelled as WAV or 320 kbps displays a steep low-pass drop (e.g., 16 kHz cutoff typical of 128 kbps or 19–20 kHz typical of MP3 encoders). While this provides clear empirical indicators of prior lossy compression, remember that artistic EQ choices or analog mastering can also shape top frequencies.

Case 2 · Club Compliance

True Peak Compliance & Headroom

Ensure no track breaches 0.0 dBTP under 4x oversampling prior to exporting USB drives for club sound systems. Over-hot inter-sample peaks produce severe harmonic distortion inside mixer D/A converters and line arrays during loud playback.

Case 3 · Beatgrid Precision

Variable Tempo & Drift Detection

Verify exact BPM and quickly spot whether a track has organic tempo drift from live drummers (disco, funk, vintage classics). This indicates beforehand whether you need dynamic beatgrid markers or manual pitch riding in your DJ software.

Case 4 · Harmonic Mixing

Camelot Key Confirmation

Confirm the musical root key and Camelot Wheel identifier to craft seamless transitions (staying in key, moving ±1 step to build or release tension, or switching between relative major/minor) without dissonant clash in basslines.

Recommended Academy Guides

Deep dive into acoustic science and technical mastering for professional DJs.

Browse all guides
Spectrogram & Quality

How to Read an Audio Spectrogram: Technical Guide for DJs

Learn how to interpret audio spectrograms: frequency axes, harmonics, dynamic range in dBFS, and how to spot low-pass cuts before playing live.

Read guide
Lossless Verification

Fake Transcodes: How to Detect Counterfeit MP3 320 and Upsampled FLAC

Why converting 128 kbps audio to WAV or FLAC never restores lost frequencies. Learn how to spot phantom cutoffs on audio spectrograms.

Read guide
Formats & Codecs

MP3 320 kbps vs FLAC on Club Sound Systems: Objective Comparison

Can you actually hear the difference between MP3 320 kbps and lossless FLAC on a festival or club PA? Psychoacoustics, transient impact, and stereo phase analysis.

Read guide
Loudness & Dynamics · ES

dBFS, LUFS & True Peak: Pro DJ Gain Staging Guide

Master ITU-R BS.1770 / EBU R128 loudness standards to eliminate inter-sample clipping on club sound systems (Academy guide in Spanish).

Read guide (ES)

Related Audio Tools

Complementary in-browser utilities to prep, fix, and elevate your DJ sets.

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Audio Format Converter

Fast, lossless batch conversion between WAV, FLAC, MP3, and AIFF directly in your browser.

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LUFS Loudness Normalizer

Target compliant loudness standards (EBU R128 / streaming) while preserving punch and headroom.

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AI Stem Separator

Split tracks into isolated vocals, drums, bass, and instrumental stems on-device using neural networks.

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Online Parametric EQ

Precision frequency shaping, high-pass filtering, and resonant peak cleanup before dropping tracks live.

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