auCDtect Task Manager is described as 'Free GUI tool that lets you check if your lossless audio files were upconverted from a "lossy" file format' and is an app in the audio & music category. There are five alternatives to auCDtect Task Manager for a variety of platforms, including Windows, Linux, Web-based, Flathub and Flatpak apps. The best auCDtect Task Manager alternative is Spek, which is both free and Open Source. Other great apps like auCDtect Task Manager are Spectro, Audiochecker, Tau Analyzer and Spectrum.
Spek helps to analyse your audio files by showing their spectrogram. Spek is free software available for Unix, Windows and Mac OS X.
Spectro is a freeware audio file analyzer for windows. Currently capable of reading FLAC, APE, MP3 and WAV files. Spectro lets you view vital data about compressed audio files and creates a spectrogram of the wave data.
Audiochecker is a tiny and portable tool which analyzes the source of WAV, LPAC, SHN, APE and FLAC audio formats, in order to verify if the encoding is lossless. If not, it means that the files in question are converted from other formats with lower quality, such as MP3.
I use Audiochecker. I have not been able to trick it. It has trouble with 24 bit files.
Tau Analyzer is a free program, which can help you to distinguish with reasonable accuracy the original studio-based CDs from poor quality fakes, that have been "reconstructed" using a lossy audio source, such as MP3.
Modeled after the spectrum effect in Ableton Live , Spectrum is a free and open-source web app that shows frequencies of an MP3 or OGG file in real-time.
Australia
Russia
United States
Spek is spectrogram visualization ONLY software. It doesn't analyse the audio stream by itself.