JI Composition Trainer

Master just intonation by composing intervals and chords from prime ratios. Three game modes with adaptive progression.

Adaptive IntervalsChord BuildingPiano Roll Onslaught

Chord Finder

Explore JI triads and seventh chords built from stacked thirds. Filter by complexity, map to any EDO.

Stacked ThirdsEDO MappingAudio Playback

Interval Cent Trainer

Memorize cent values of JI ratios and EDO intervals. Adaptive learning with graduated feedback.

JI & EDOAdaptive LearningCustom PoolsReverse Mode

Functional Harmony

Explore harmonic function classification across EDO systems. Interactive chord playback, MIDI export, and scale filtering.

12+ EDO SystemsChord PlaybackMIDI ExportScale Filtering

MOS Scale Explorer

Find Moment of Symmetry scales across equal temperaments. Explore generators, step patterns, and mirror MOS.

All GeneratorsBy GeneratorMirror MOSScale Visualization

EDO Explorer

Explore equal divisions of the octave and compare temperaments.

Compare EDOsInterval MappingError Analysis

Coming Soon

Lattice Visualizer

Visualize JI intervals and chords on a prime-indexed lattice.

2D/3D LatticeHarmonic SeriesCommas

Coming Soon