There are a few choices, but the most popular software, and the one I use, is Mixed In Key.

Hey alexmarsden,

As phatbob says, there are a few choices but Mixed in Key is very popular. I use it myself.

www.mixedinkey.com

Regards

Dave W

beatunes is also nice and works on wnidows and mac

So with these , i tried beatunes and it doesnt let serato reconise the key, is this my fault or settings, if its the settings does mixed in key enable access automatically to the files before i fork out more money : p

Hey alexmarsden,

Not sure about Beatunes at all. Maybe something you're doing, or it maybe not compatible. However I'm sure if you wanted to you could copy the Key info from your tracks in Beatunes into the Comment or Key column in ITCH.
However using Mixed In Key and I know it works with Serato. You need to analyze your Serato Music Library within Mixed In Key. I tend to set up up this way: preferences>Key>overwrite Comments, File Renaming> Un-click Automatically rename files after analysis

Hope this is helpful. Let me know if you need anymore help with this.

Regards

Dave W