# Spectro — Fake Lossless Detector for Mac (https://www.getspectro.app) > Spectro is a native macOS app (v1.4) for detecting fake lossless audio files in DJ and audiophile libraries. It batch-scans WAV, AIFF, FLAC, ALAC, MP3, and AAC files and returns an automatic LOSSLESS, FAKE, or MEDIUM verdict per track using Verdict Engine v1.4 — multi-segment spectral cutoff analysis with adaptive threshold, 44.1→48 kHz upsampling detection, classical and acoustic recording false positive reduction (15 kHz floor), crest factor, clipping detection, and stereo correlation. Supports Rekordbox XML and M3U/M3U8 import, watch folder, and batch notifications. It is the only native Apple Silicon tool built specifically for fake lossless detection in DJ libraries. Not affiliated with Spectro B.V. or any industrial/IoT product named Spectro. - https://www.getspectro.app/fake-flac-detector - https://www.getspectro.app/blog/lossless-audio-checker-online-vs-offline - https://www.getspectro.app/audiochecker-alternative - https://www.getspectro.app/blog/verify-flac-files-genuinely-lossless - https://www.getspectro.app/blog/how-fake-lossless-detection-works ## Primary pages - [Home](https://www.getspectro.app): Download Spectro-1.4.0.dmg, pricing ($39 one-time), 100-track free trial. - [Facts](https://www.getspectro.app/facts): Canonical product facts — supported formats (WAV, AIFF, FLAC, ALAC, MP3, AAC), verdict definitions, Verdict Engine v1.4, privacy model. Current version: 1.4.0. - [FAQ](https://www.getspectro.app/faq): Common questions about fake lossless detection and how Spectro works. - [Guides](https://www.getspectro.app/guides): Hub for all how-to guides on using Spectro. - [Changelog](https://www.getspectro.app/changelog): Version history and recent feature updates. ## Use-case pages - [AudioChecker Alternative for Mac](https://www.getspectro.app/audiochecker-alternative): Native replacement for the discontinued AudioChecker tool — batch fake lossless detection on macOS. - [Fake FLAC Detector for Mac](https://www.getspectro.app/fake-flac-detector): Detect FLAC files re-encoded from MP3 or AAC using spectral analysis — batch, offline. - [Fake Lossless Checker for Mac](https://www.getspectro.app/fake-lossless-checker-mac): How to identify MP3/AAC files disguised as WAV/AIFF/FLAC on macOS. - [Spek Alternative for Mac](https://www.getspectro.app/spek-alternative-mac): Spectro as a modern replacement for Spek with automatic verdicts and batch scanning. - [Lossless Audio Checker](https://www.getspectro.app/lossless-audio-checker): Verifying audio file integrity before gigs or archiving. - [Audio Quality Checker for DJs](https://www.getspectro.app/audio-quality-checker-for-djs): DJ-specific workflow for auditing library quality before USB exports. - [Rekordbox Audio Checker](https://www.getspectro.app/rekordbox-audio-checker): Checking audio quality in Rekordbox libraries before AlphaTheta hardware exports. - [Serato Audio Checker](https://www.getspectro.app/serato-audio-checker): Auditing Serato DJ libraries for fake lossless files. ## Blog - [Beatport vs Bandcamp Audio Quality for DJs — Spectro](https://www.getspectro.app/blog/beatport-vs-bandcamp-audio-quality): Both stores sell lossless audio to DJs — but they handle quality very differently. Here's how Beatport and Bandcamp compare on audio delivery, and what the DJ community has actually found. - [How to Detect Fake Hi-Res Audio: When Your 24-bit FLAC Is an Upsampled CD](https://www.getspectro.app/blog/detect-fake-hi-res-audio): A 24-bit/96kHz FLAC can still contain CD audio upsampled to hi-res. Here's how to spot it using spectral analysis — and what genuine hi-res looks like. - [How to Audit Your DJ Library for Fake Lossless Audio](https://www.getspectro.app/blog/dj-library-audit-guide): A complete workflow for scanning your full DJ library, identifying fake lossless files, and building a clean catalog you can trust before any gig. - [Why Your 320kbps MP3 Sounds Like 128kbps — Spectro](https://www.getspectro.app/blog/fake-320-kbps-mp3): A 320 kbps MP3 transcoded from a 128 kbps source sounds like 128 kbps — regardless of the bitrate on the label. Here's the science behind why, and how to detect it. - [Fake Lossless & Stem Separation: Does It Matter? — Spectro](https://www.getspectro.app/blog/fake-lossless-stems-key-detection): Fake lossless files don't just sound worse — they degrade stem separation results and can throw off key detection. Here's what's actually happening and why it matters. - [Fakin' The Funk Alternative for Mac (2026) — Spectro](https://www.getspectro.app/blog/fakin-the-funk-alternative-mac): Fakin' The Funk is the standard for fake lossless detection on Windows — but Mac users need a native alternative. Here's what to use instead. - [FLAC vs WAV vs AIFF for DJs: Best Format? — Spectro](https://www.getspectro.app/blog/flac-vs-wav-aiff-dj): FLAC vs AIFF vs WAV for DJs: what actually differs and what doesn't. All three are lossless — here's when the format choice matters and when it doesn't. - [The Science Behind Fake Lossless Audio Detection](https://www.getspectro.app/blog/how-fake-lossless-detection-works): How does a tool know a FLAC file contains a 128 kbps MP3? The answer is in the frequency spectrum. A breakdown of the peer-reviewed research behind spectral fake lossless detection. - [How to Check Audio Quality Before a Gig](https://www.getspectro.app/blog/how-to-check-audio-quality-before-gig): Bad audio quality in your DJ set is avoidable. Here's a practical checklist for checking your files before you play - and how to catch fake lossless tracks before they cause problems. - [How to Detect Fake Lossless Audio Files on Mac](https://www.getspectro.app/blog/how-to-detect-fake-lossless): A fake lossless file looks like WAV or FLAC but sounds like MP3. Here's how to detect them using spectrograms — and scan your entire library automatically. - [Is Beatport Actually Lossless? How to Check — Spectro](https://www.getspectro.app/blog/is-beatport-lossless-real): Beatport sells WAV and AIFF files labeled as lossless — but are they always genuine? Here's how music distribution can introduce transcoding without anyone noticing, and how to verify any download in seconds. - [Is Beatsource Audio Quality What You Think It Is?](https://www.getspectro.app/blog/is-beatsource-lossless-real): Beatsource combines Beatport and POOL catalog for open format DJs. But are its WAV downloads genuinely lossless? Here's what open format DJs need to know. - [BPMSupreme Download Quality: WAV or Fake WAV?](https://www.getspectro.app/blog/is-bpmsupreme-lossless-real): BPMSupreme offers high-quality WAV downloads to subscribers — but are they always genuinely lossless? Here's what DJ pool subscribers need to know about audio quality verification. - [Is DJcity Audio Actually Lossless?](https://www.getspectro.app/blog/is-djcity-lossless-real): DJcity is one of the most widely used record pools for club DJs. But are its WAV downloads genuinely lossless? Here's what you need to know and how to verify. - [Is Spotify Lossless Actually Lossless? What the HiFi Tier Really Delivers](https://www.getspectro.app/blog/is-spotify-lossless-actually-lossless): Technical breakdown of what Spotify's lossless tier delivers (FLAC 16-bit/44.1 kHz), how it compares to Apple Music and Tidal, and how to verify audio quality in your downloaded music library. - [Is Your Hi-Res Download Actually Hi-Res? Verify Qobuz, HDtracks, and Bandcamp](https://www.getspectro.app/blog/is-hi-res-download-actually-hi-res): Qobuz, HDtracks, and Bandcamp sell 24-bit hi-res FLACs — but are they always genuine? Here's how to verify any hi-res download is actually hi-res, not an upsampled CD. - [Is Juno Download Audio Lossless?](https://www.getspectro.app/blog/is-juno-download-lossless-real): Juno Download is a key source for house, techno, and electronic music DJs. But are its WAV and AIFF downloads genuinely lossless? Here's what you need to know. - [Is Tidal FLAC Really Lossless? How to Verify Your Downloads](https://www.getspectro.app/blog/is-tidal-flac-really-lossless): Tidal calls it lossless — but not every file delivers. Learn how to spot fake FLACs, what spectral cutoffs reveal, and how to verify your library in seconds. - [Is Your Traxsource Download Actually Lossless?](https://www.getspectro.app/blog/is-traxsource-lossless-real): Traxsource sells WAV and AIFF downloads labeled as lossless — but are they always genuine? Here's how to verify any Traxsource file and what the DJ community has found. - [Lossless Audio Checker: Online vs. Offline — Which Is More Accurate?](https://www.getspectro.app/blog/lossless-audio-checker-online-vs-offline): Looking for a lossless audio checker? This guide covers what online audio checkers can and can't do — and why a native Mac app gives more complete results for batch DJ library scanning. - [Lossless False Positives: Is the Checker Wrong? — Spectro](https://www.getspectro.app/blog/lossless-false-positives): Spectro flagged your lossless file as FAKE — but is it? Learn the four real cases where a genuine lossless file triggers a false positive and how to verify. - [Does Fake Lossless Audio Affect Mixed In Key Analysis?](https://www.getspectro.app/blog/mixed-in-key-fake-lossless): Fake lossless files can skew harmonic key detection in Mixed In Key. Here's how lossy encoding artifacts affect key analysis — and what to do about it. - [MP3 Disguised as WAV: Detect Fake Lossless Files — Spectro](https://www.getspectro.app/blog/mp3-disguised-as-wav): Your WAV files might not be what they claim. Here's exactly how MP3s get repackaged as WAV or AIFF — and how to spot them before your next gig. - [Rekordbox Audio Checker: Download to USB Workflow — Spectro](https://www.getspectro.app/blog/rekordbox-audio-checker-workflow): A complete step-by-step workflow for Rekordbox DJs to verify audio quality before exporting to USB — from purchase to scan to CDJ-ready set. - [Spectro for Engine DJ / Denon: Verify Files Before USB Export](https://www.getspectro.app/blog/spectro-for-engine-dj): Engine DJ doesn't check whether your WAV files are genuinely lossless before export. Here's how to add an audio quality check to your Denon DJ workflow before loading your USB. - [Spectro for Serato DJs: Verify Your Crates Before the Gig](https://www.getspectro.app/blog/spectro-for-serato): Serato DJ Pro doesn't check whether your WAV files are genuinely lossless. Here's how to add an audio quality check to your Serato workflow before you play. - [Spectro for Traktor Users: Clean Your Library Before Import](https://www.getspectro.app/blog/spectro-for-traktor): Traktor Pro doesn't verify whether your WAV and AIFF files are genuinely lossless. Here's how to check your library before importing into Traktor and avoid quality problems in your sets. - [Spectro for VirtualDJ: How to Check Audio Quality Before Loading](https://www.getspectro.app/blog/spectro-for-virtual-dj): VirtualDJ doesn't verify whether your WAV files are genuinely lossless. Here's how to check your library before your next set and avoid fake lossless files on any system. - [Spectro vs. Fabl: Which Is Better for Detecting Fake Lossless Audio?](https://www.getspectro.app/blog/spectro-vs-fabl): Fabl is a free browser-based audio quality checker. This guide covers what Fabl does, how it works, and how it compares to Spectro for DJ library scanning and batch analysis. - [Spectro vs Spek: Which Is Better for Detecting Fake Lossless Audio on Mac?](https://www.getspectro.app/blog/spectro-vs-spek): Spek shows you a spectrogram. Spectro tells you what it means. A direct comparison for DJs who need more than a visual. - [How to Detect Fake Hi-Res Audio: When Your 24-bit FLAC Is an Upsampled CD](https://www.getspectro.app/blog/detect-fake-hi-res-audio): A 24-bit/96kHz FLAC can still contain CD audio upsampled to hi-res. How to detect the 44.1→48 kHz upsampling gap and verify genuine hi-res using spectral analysis. - [Is Your Hi-Res Download Actually Hi-Res? Verify Qobuz, HDtracks, and Bandcamp](https://www.getspectro.app/blog/is-hi-res-download-actually-hi-res): How to verify that 24-bit hi-res downloads from Qobuz, HDtracks, and Bandcamp contain genuine hi-res audio and not upsampled CD quality. - [Best Spek Alternatives for Mac in 2026](https://www.getspectro.app/blog/spek-alternatives-mac): Spek hasn't been updated since 2013. Here are the real alternatives for Mac users who need to analyze audio files and detect fake lossless tracks - including one that does it automatically. - [How to Verify Your FLAC Files Are Actually Lossless](https://www.getspectro.app/blog/verify-flac-files-genuinely-lossless): Bought FLAC from Qobuz, HDtracks, or Bandcamp? Here's how to verify the files are genuinely lossless — and what fake FLAC looks like when you check the frequency spectrum. - [What Is Fake Lossless Audio? A Guide for DJs](https://www.getspectro.app/blog/what-is-fake-lossless-audio): Your WAV files might not be lossless. Here's what fake lossless audio is, why it ends up in DJ libraries, and what you can do about it. - [Why Fake FLAC Still Exists in DJ Libraries in 2026](https://www.getspectro.app/blog/why-fake-flac-still-exists): Fake lossless audio has been a known problem for over a decade. Here's why it still exists, how it keeps entering DJ libraries, and what the distribution chain looks like from the inside.