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Acoustic spectrum analyser
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Spek is an acoustic spectrum analyser written in C and C++. It uses FFmpeg libraries for audio decoding and wxWidgets for the GUI.

Spek is available on *BSD, GNU/Linux, Windows and Mac OS X.

Find out more about Spek on its website:

Spek 0.8.1 - Released 2012-09-27

New Features And Enhancements

Spek 0.8.1 is part of beta 0.x releases, leading up to a stable 1.0 release (hopefully) later this year. The roadmap is available on GitHub.

New features since 0.7:

  • 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 8 more languages (totalling 16).


  • Switched to .xz tarballs.
  • Split out libspek and added unit tests.
  • 24-bit APE support (upstream fix).
  • Better toolbar icons on Windows and OS X (#21).
  • Installer options for app shortcuts on Windows (#1).
  • Associate with audio/video files on OS X (#2).
  • Online manual (#24).


  • Fixed crash when the preferences file is not writable.
  • Fixed crash when the home directory is not writable.
  • Fixed duration and rendering for some video files.
  • Fixed compilation with newer FFmpeg and libav versions.
  • Proper handling of Unicode file names under Windows (upstream fix).
  • Don't lock the input file on Windows (#26).
  • Fixed mapping of the spectral density into the palette.

Sources / Packages

Spek 0.8.1 tarball:

Windows and Mac OS X binaries:

Unix packages:


  • wxWidgets >= 2.8
  • FFmpeg >= 0.7 or libav >= 0.8
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