Key and energy detection with Camelot notation written back into tags.
Paidkey detectionenergyFeatured
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Open-source musical key detection for large batches of files.
Freekey detectionopen source
Look up BPM, key, energy and danceability for a released track in seconds.
FreemiumbpmkeyFeatured
BPM, key and Camelot lookups plus playlist-wide analysis views.
Freemiumbpmkey
The reference explainer for Camelot notation and harmonic mixing rules.
FreecamelottheoryFeatured