FAQ
Frequently Asked Questions
Last updated: 2026-04-20
What file formats does Spectro support?
WAV, AIFF, FLAC, and MP3. Spectro reads the actual frequency content, not just the file extension or container format.
How does it detect fake lossless files?
Spectro runs a full FFT spectral analysis on each file and measures where the frequency content actually ends. A genuine lossless file has energy up to 20-22kHz. A fake lossless - an MP3 or AAC re-encoded as WAV - shows a hard cutoff, typically around 16-20kHz.
What is fake lossless audio?
A fake lossless file is an MP3 or AAC that has been re-encoded and saved as WAV, AIFF or FLAC. The file size is larger but the audio quality is identical to the original compressed file - the high frequencies above the MP3 cutoff are permanently lost. Playing a fake lossless on a professional PA system means lost high frequencies and a set that doesn't hit the way it should.
What is a spectral cutoff?
The frequency point where audio content stops. A genuine lossless file has energy up to 22kHz. A fake lossless shows a hard cutoff around 16-20kHz - the fingerprint of lossy encoding that Spectro detects instantly.
Is Spectro a Spek alternative?
Yes. Spectro is a modern macOS alternative to Spek - built natively for Apple Silicon and Intel, with batch processing, automatic LOSSLESS / FAKE / MEDIUM verdicts, and Finder Tag integration. No manual interpretation needed.
Will it work with Beatport and Bandcamp downloads?
Yes. Spectro processes files from any source - WAV, AIFF, FLAC, and MP3.
Does it upload my files anywhere?
No. Spectro runs entirely on your Mac. Nothing is uploaded, no account is needed, and no internet connection is required for analysis. Your unreleased promos and unannounced tracks never leave your machine.
What macOS version is required?
macOS 13 Ventura or later. Optimized for Apple Silicon and Intel Macs.
How does the free trial work?
Spectro is free for your first 25 files - no time limit, no account required. Download and try it on your own tracks before buying.
What happens after I buy?
You receive a license key by email. Enter it in the app to unlock unlimited scans with a 2 Mac license.