I actually just made an Android app that gives you the key of an audio sample you play into the mic. Works best for songs with a loud lead part, and you can use external mics if your device supports it. iOS version getting approved.
Song Key Finder (free and paid versions)
I'm a drummer, not a DJ, so I'm trying to find out more about what people would want from this tool. If you have any feedback, feel free to let me know.
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