BPM & キー検出
スペクトラルアナライザー
DSP エンジン: v2.4⚡ ブラウザのみのマルチバンド特徴抽出とクロマ分析
キャメロットホイール
ハーモニックミキシングは曲のキーを合わせ、シームレスなトランジションを実現します。
同じキー例: 8A → 8A（完璧なブレンド）
エネルギーブースト時計回り +1: 例 8A → 9A
エネルギードロップ反時計回り -1: 例 8A → 7A
クロスモードA ↔ B: 例 8A ↔ 8B
ABOUT THIS TOOL
Free Online BPM & Key Finder for DJs and Producers
Detect tempo (BPM), musical key, and Camelot notation from any audio file — entirely in your browser. Built for harmonic mixing prep: find compatible keys and tempos before your next set or production session.
How it works
- 01Upload an audio file (MP3, WAV, FLAC, AAC, OGG) or pick one from Library after sign-in.
- 02Essentia.js analyzes beat onsets and chromagram in WebAssembly — BPM (with half/double toggle) and key appear in seconds.
- 03Use the Camelot mixing guide to plan harmonically compatible transitions with adjacent wheel codes.
Key features
- Browser-local analysis — your audio stays on your device
- BPM detection with half/double tempo correction
- Musical key plus Camelot (Open Key) notation
- Harmonic mixing cheat sheet for DJ transitions
Common questions
Musictool uses Essentia.js — the same MIR algorithms used in research and production tools, compiled to WebAssembly. Most commercial tracks return stable BPM and key; live recordings or heavily processed audio may need manual half/double BPM adjustment.