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: http://spek.cc/

Spek 0.8.2 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 11 more languages (totalling 19).
• Open .opus audio files (#39).

Enhancements:

• 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).
• Use non-deprecated FFmpeg decoding API.
• Moved downloads to Google Code since GitHub no longer offers downloads (#38).
• Compatibility with retina-based Macs (#32).

Bugfixes:

• 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.
• Fix magnitude calculation for the first and the last frequency band.
• Support planar sample formats (#44).

Spek 0.8.2 tarball:

• https://github.com/alexkay/spek/releases/download/v0.8.2/spek-0.8.2.tar.xz

Windows and Mac OS X binaries:

• https://github.com/alexkay/spek/releases/download/v0.8.2/spek-0.8.2.msi
• https://github.com/alexkay/spek/releases/download/v0.8.2/spek-0.8.2.zip
• https://github.com/alexkay/spek/releases/download/v0.8.2/spek-0.8.2.dmg

Unix packages:

• https://github.com/alexkay/spek/blob/master/INSTALL.md#bsd-and-gnulinux

• wxWidgets >= 2.8
• A recent version of FFmpeg or libav