This tool uses advanced audio signal analysis running entirely inside your browser.

Here’s what happens behind the scenes (in simple terms):

• Your track is decoded locally using the Web Audio engine.

• The audio is converted to mono for accurate rhythmic detection.

• A professional BPM detection algorithm analyzes rhythmic patterns and transient energy.

• A harmonic analysis engine extracts pitch information to determine the musical key.

• The result is mapped to standard notation and Camelot wheel format.

All processing runs in real-time using WebAssembly for speed and precision — similar to desktop-grade audio software, but fully online.

BPM — The detected tempo in beats per minute. This is the primary beat pulse of the track.

Half-time BPM — Exactly half the detected BPM. Useful if the track feels like it could be interpreted at a slower, heavier groove. Common in genres like hip-hop, trap, and half-time drum and bass.

Double-time BPM — Exactly double the detected BPM. Relevant if the track’s energy feels faster than the stated tempo suggests — common in techno and hardstyle DJ contexts.

Key — The detected musical key (e.g. A Minor, F♯ Major). Displayed with a confidence percentage.

Relative Key — Every major key has a relative minor that shares the same notes (and vice versa). If a track is detected as C Major, its relative minor is A Minor. Both are shown because ambiguity between relative pairs is common and musically meaningful.