Upload an MP3, get the tempo. Uses low-frequency peak detection — works well on songs with a steady kick or beat.
Note on key detection: The original tool was billed as "BPM + Key" but key detection in-browser without heavy ML libraries (50+ MB downloads) is unreliable. For key, use songdata.io (free) or any DAW's built-in analyzer.
Analysis runs in your browser. Nothing uploaded anywhere.
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Beats per minute
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