A native macOS app that checks the mastering of your music files: dynamic range, loudness, clipping, spectrum and stereo image, with a plain verdict per track and per album. Built with SwiftUI and Accelerate, no external dependencies.

• DR14 dynamic range following the Pleasurize Music Foundation spec, as used by foobar2000's DR Meter and the DR Database: whole track, every channel, 3-second blocks, top 20% RMS, second-highest peak. Matches ffmpeg's drmeter on the same PCM.
• Loudness: approximate integrated loudness (LUFS) and loudness range.
• Clipping and true peak: clipped-sample detection and 4× oversampled true peak (dBTP).
• Spectral analysis: FFT average spectrum with cutoff detection to flag fake lossless files (lossy sources transcoded to FLAC/WAV).
• Stereo image: L/R correlation, Mid/Side width, per-band width, phase issues and a vectorscope.
• Album analysis: analyze a whole folder (3 tracks at a time) and get a sortable table with album averages.
• A/B comparison: compare two editions of the same album (remaster vs. original, CD vs. SACD) track by track.
• Native DSD: reads DSF files directly and converts DSD to PCM with Accelerate (vDSP), fast enough for whole albums.

Supported formats: DSF, FLAC, WAV, AIFF, ALAC/M4A, MP3, AAC.

The iOS version, Dr. Doctor, is available on the App Store and gives identical results.

With Homebrew:

brew install --cask prietus/drdoctor/drdoctor

Or download the signed and notarized DMG from Releases and drag DrDoctor to Applications.

Requires macOS 14 Sonoma or later.

Open DrDoctor.xcodeproj in Xcode and run the DrDoctor scheme, or:

xcodebuild -project DrDoctor.xcodeproj -scheme DrDoctor -configuration Release build

Build in Release when measuring performance: the DSD decoder and analyzers are much slower without optimization.

Each track gets a score from its DR value, loudness, clipping and spectral checks:

Lossy-source detection is skipped for DSD, because the DSD-to-PCM low-pass filter produces a sharp cutoff by design.

MIT