KeyFinder is an open source key detection tool, for DJs interested in harmonic and tonal mixing. It’s intended to be very focused: no library management, no track suggestions, no media player. Just a fast, efficient workflow tool. It supports a huge range of codecs thanks to LibAV, and writes to metadata tags using TagLib.
www.ibrahimshaath.co.uk/keyfinder
github.com/ibsh/is_KeyFinder
The Audio File 
Hey, amazing software, i’m trying to make it work with foobar like a plugin. ¿Any news on that?
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No, it’s a standalone app, but once the files are tagged, you can set up a custom column in Foobar2000.
You can also use Mixx, which optionally uses the KeyFinder libraries.
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