Spek

Spek helps to analyse your audio files by showing their spectrogram. Spek is free software available for Unix, Windows and Mac OS X. Features: - Supports all popular lossy and lossless audio file formats thanks to the FFmpeg libraries.

Free Open Source Mac OS X Windows Linux

auCDtect Task Manager

auCDtect Task Manager is a free GUI tool that lets you check if your lossless audio files were upconverted from a "lossy" file format.

Free Windows

Lossless Audio Checker

Lossless Audio Checker is a utility to check whether a FLAC or WAVE file is truly lossless or not, by detecting cutoff frequencies. It can show you the full frequency range for each file.

Free Mac OS X Windows Linux Web

Audiochecker

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.

Free Windows

Spectro

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...

Free Windows

Spectrum

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.

Free Open Source Web GitHub