ChordFold

ChordFold is a browser-based AI chord finder that helps musicians discover chord progressions from recorded music. Users can select an MP3, WAV, or another browser-supported audio file, and ChordFold estimates the chords and their timing. The recognition model runs locally in the browser instead of requiring audio to be sent to a remote inference server. After analysis, users can explore an interactive chord timeline synchronized with playback. Selecting a chord lets users return to the corresponding moment in the recording and listen again. The tool also provides guitar chord diagrams and piano note references for supported chords. Core features include: AI chord recognition from audio. Local inference using an ONNX recognition model. Interactive time-aligned chord progression. Synchronized playback and chord navigation. Guitar and piano references. Audio files up to 14 MB and 10 minutes. No account required. Automatic chord detection is experimental and can make mistakes with complex arrangements, distorted instruments, and unusual harmonies. ChordFold is designed to help musicians listen, explore, and verify chord progressions rather than replace manual musical understanding.