See the GNU General Public License for more details. So you can see that according to this research, the best key detection in 2020 is by Mixed In Key (76.5), but that of the big DJ software platforms, Traktor (73.8) and Rekordbox (69.2) are not so far behind.

KeyFinder is licensed under the GPL version 3, and is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Please contact me if you have any questions, or if you want to get involved. There are different websites, apps, and VST plugins, each with differing levels of accuracy. Another feature is the ability to retrieve product keys from unbootable Windows installations. Today there are easy and reliable ways to find the key of any song. It also has a community-updated configuration file that retrieves product keys for many other applications. The algorithms, design and implementation are described in some detail in my project report, which you can download, though it's a bit heavy going. The Magical Jelly Bean Keyfinder is a freeware utility that retrieves your Product Key (cd key) used to install windows from your registry. I originally developed KeyFinder in 2011 as part of my MSc in Computer Science. I don't claim that KeyFinder is better than other key estimation software, but it shows that the algorithm is in the same league as even the best paid alternatives. Here's a comparison with some other packages. The accuracy of the algorithm is pretty good. It supports a huge range of codecs thanks to LibAV, and writes to metadata tags using TagLib. It's intended to be very focused: no library management, no track suggestions, no media player. KeyFinder is an open source key detection tool, for DJs interested in harmonic and tonal mixing.

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