ChordScope vs Cantus

ChordScope visualizes harmony in real time from MIDI input. Connect a MIDI keyboard or controller and play. ChordScope detects the chord you’re playing and highlights the corresponding notes on a one-octave piano keyboard.  Notes that belong to the chord’s scale are shown clearly, making harmonic relationships easy to understand at a glance. Ideal for musicians, composers, and learners, ChordScope provides immediate visual feedback to help you explore chords and progressions as you play.

Cantus - Voicing Lab is an interactive harmony and chord-voicing tool by Nathaniel School of Music for pianists, composers, producers, and music theory students. Explore how notes move inside chords, hear voicings in context, and study color, tension, and modal relationships from the keyboard. Cantus is designed as a focused practice lab: pick a sound, inspect the voice leading, and build intuition for how harmony feels under your hands. FEATURES * Interactive chord and voicing explorer * Piano keyboard visualization * Modal and scale-based harmony practice * Voice-leading movement and pinboard-style comparison * Tone.js audio playback * Self-hosted fonts and bundled web assets * Works without an account BY NATHANIEL SCHOOL OF MUSIC Built for practical harmony learning, composition practice, and deeper chord fluency.