Spectro

Fake lossless audio is audio that is stored in a lossless container such as WAV, AIFF, or FLAC but was originally created from a lossy source like MP3 or AAC. Converting lossy audio to a lossless format does not recover removed frequencies. It only changes packaging and file size. DJ software, Rekordbox, Serato, and Traktor treat these files as normal lossless tracks because they read the container, not the spectral history of the audio. Fake lossless often enters libraries through store delivery mistakes, label uploads, promo pools, re-encoding workflows, or file sharing. At club volume on a professional PA, the missing high-frequency content can sound dull or smeared compared with a genuine lossless master. The reliable check is spectral analysis: genuine lossless audio usually shows energy approaching the Nyquist limit near 22 kHz for 44.1 kHz files, while fake lossless shows a flat wall where the lossy encoder stopped.

Yes. Spectro supports Rekordbox XML import directly. Go to File → Import from Rekordbox and select your Rekordbox XML export file. Spectro loads your full collection automatically. No drag and drop required.

Yes. Spectro 1.3 added full ALAC support. Apple Lossless files (.m4a) are analyzed the same way as WAV and FLAC. Spectral content determines the verdict, not the container.

Yes. Spectro analyzes audio fully on your Mac. Files are not uploaded to a server for scanning, and analysis does not require an internet connection. That matters for unreleased promos, label exclusives, and large local libraries you do not want to send to a browser-based checker. Spectro is a native macOS app with a 100-track free trial and a one-time lifetime license after the trial. Personal $24.99 (1 Mac) or Duo $39 (2 Macs), same features. License activation uses Lemon Squeezy online validation on a schedule, but the audio analysis workflow itself stays on-device. Optional product analytics may be enabled in newer releases, yet the core fake-lossless scan remains local. For privacy-sensitive DJ workflows, offline batch folder scanning is the primary use case: drag in a download folder, get LOSSLESS, FAKE, or MEDIUM results per file, tag suspicious tracks in Finder, and export CSV summaries without exposing your library to a third-party upload service.

Spectro is free for your first 100 tracks. No time limit, no account required.

Yes. Use File → Export CSV to save your full batch results with verdict, format, bitrate, cutoff frequency, and confidence score for every track.

Yes. Spectro supports PNG export for individual spectrograms and bulk export for a batch of analyzed tracks.