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Spek helps to analyze your audio files by showing their spectrogram.


  • Supports all popular lossy and lossless audio file formats thanks to the FFmpeg libraries.
  • Ultra-fast signal processing, uses multiple threads to further speed up the analysis.
  • Shows the codec name and the audio signal parameters.
  • Allows to save the spectrogram as an image file.
  • Drag-and-drop support; associates with common audio file formats.
  • Auto-fitting time, frequency and spectral density rulers.
  • Adjustable spectral density range.
  • Translated into more...

What's New

Version 0.8.2:
  • Adjustable spectral density range (#4).
  • Switched from GTK+ to wxWidgets for better Windows and OS X integration.
  • Single .exe version for Windows.
  • Added translations in 11 more languages (totalling 19).
  • Open .opus audio files (#39).
  • Switched to .xz tarballs.
  • Split out libspek and added more...


OS X 10.5 or later

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Spek User Discussion

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Samadams Member IconReview+1

This is a great little app. Very quick to plot spectrum, as well as an excellent visual representation of the spectrum. I've used other more elaborate apps to plot spectrum (Audacity, Adobe Audition) which take far longer to use (longer learning curve too) and are overkill if all you need is to plot audio spectrum.

I appreciate that it plots multiple audio formats, including flac, mp3, AAC, etc. A very handle tool for determining if any music you've downloaded is bad audio quality or transcode.

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Version 0.8.2
There are no Ratings for this App yet.
> 5 1


Current Version (0.x)


Downloads 1,822
Version Downloads 1,822
Date 10 Feb 2014
Platform OS X / Intel 32
Price Free
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