Chord Builder
Click notes to build chords and hear them with Web Audio. Learn how different intervals create consonance, dissonance, and everything in between.
Select Notes
Click on the keys below to start building a chord.
Octave 3
Octave 4
Octave 5
About Consonance & Dissonance
Intervals that sound stable and pleasant together. Examples: major/minor thirds, perfect fifths, and sixths.
Intervals that can sound either stable or tense depending on context. Perfect fourths and sevenths fall here.
Intervals that create tension and a need for resolution. Tritones, seconds, and sevenths create this effect.
This tool generates tones using the Web Audio API. Each note is a pure sine-triangle wave — real instruments add overtones that make chords sound richer, but the underlying harmonic relationships are the same. The harmony engine in Blob Opera uses these same principles to create its beautiful four-part harmonies.