Tonal & Chords
Key detection, HPCP chroma, frame- and beat-synced chords, roman numerals, inversions and melody.
- KeyExtractor
- HPCP
- ChordsDetection
Pure frontend · WebAssembly · Zero uploadAnnotate,
Annotate,
understand,
on your device.
Drop in a track and mark it up on the audio timeline — chords, melody, tempo, sections and notes — with Essentia's WebAssembly analysis on hand to suggest. Then turn what you mapped into play-along games. Everything runs locally in your browser.
- 200+
- WASM algorithms
- 100%
- on-device
- 0
- files uploaded
Chord grid · 4/4
Amvi
FIV
CI
GV
Dmii
GV
CI
CI
Key
C major
Tempo
122 BPM
Energy
Energy
Assistive analysis
Detected, then you decide
Essentia's results arrive as suggestions on the timeline — accept what's right, edit what isn't. Everything runs in a local Web Worker pool, so the interface never blocks.
Rhythm
Multi-feature and Degara beat tracking, tempo histograms, rubato, onset functions and beat loudness.
- RhythmExtractor2013
- OnsetDetection
Timbre & Spectrum
Mel spectrogram, MFCC/BFCC/GFCC, spectral centroid, flux, flatness, contrast and entropy.
- MFCC
- MelBands
- SpectralContrast
Machine Learning
On-demand TensorFlow.js models for mood, danceability, voice/instrumental and MusicBrainz autotagging.
- MusiCNN
- VGGish
Live & Explorer
Real-time microphone analysis plus an algorithm lab to tweak parameters and compare results.
- Real-time
- Sandbox
Turn analysis into play
Chord Rush charts are generated from the detected beats and chords of your own track. Practice ear training, memory and naming games too.