Chord AI Free - Online Chord Finder & Audio Recognition | Guitariz

How Chord AI Works

Most basic chord detectors rely on rudimentary pitch-class profiling, leading to frequent errors on complex musical arrangements. Guitariz Chord AI employs a robust digital signal processing pipeline built on Librosa: Harmonic-Percussive Source Separation (HPSS) isolates harmonic tonal content from transient drum noise, Constant-Q chroma features are extracted from the harmonic stream, and pitch distributions are matched against harmonic chord templates.

Viterbi HMM Smoothing: Raw frame-by-frame chord estimates are regularized using a log-space Viterbi-based Hidden Markov Model. This ensures musically plausible transitions and eliminates erratic fractional-second chord fluttering.

From Audio Files or YouTube: Upload local MP3, WAV, or FLAC audio files or paste a YouTube URL—the engine decodes, analyzes, and synchronizes the chord progression timeline automatically.

Neural Network Roadmap: A CRNN (Convolutional Recurrent Neural Network) architecture is in development to provide an additional neural recognition mode alongside the current DSP baseline, deployable via ONNX Runtime.

Chord AI vs. the Chord Finder

Chord AI listens to a recording and writes out the chords. If you already have notes under your fingers, such as a fret shape you are unsure about, use the Chord Finder instead: pick the notes on a guitar neck or piano and it names the chord, including inversions.

What You Get

• Full synchronized chord timeline synced to audio playback
• Detected primary key signature and mode
• Estimated tempo (BPM)
• Standard chord notation symbols (Major, Minor, 7, maj7, m7, sus4, dim, aug)