JIntonation
Hear and compare tunings.
A harmonic-table instrument for hearing the difference between tuning systems — not just reading about it.
Hold a chord, then switch between 12-tone equal temperament and just intonation with a single tap. The notes retune underneath your fingers so you can hear the beating smooth out, instantly and in context. A live readout shows each note's frequency in hertz and, in just intonation, how many cents it sits away from the equal-tempered pitch.
The notes live on a hexagonal harmonic table. Unlike a piano keyboard, the same musical interval always points the same direction: fifths run one way, major thirds another, minor thirds another. Chords become shapes you can move around the grid, and every chromatic note is always present — changing key or mode only changes what's highlighted, never what's reachable.
Why Musicians and Students Like It
- • Hear the theory—Listen to tuning concepts instead of memorizing them.
- • Compare in real time—Switch equal temperament and just intonation on the same chord, even while notes are held.
- • See the numbers—Exact frequencies and cents offsets update as you play.
- • Explore the layout—Intervals and chord shapes on an isomorphic, harmonic-table grid.
Features
- • Harmonic-table grid—A hexagonal layout with all twelve pitch classes.
- • Instant retuning—Switch between 12-TET and fixed just intonation, even while notes are held.
- • Live readouts—Frequency in hertz and cents offset from equal temperament.
- • Key, mode, and octave—Pick a root, one of the seven diatonic modes, and an octave.
- • Six tone colors—From a pure sine to a bright, harmonically rich voice.
- • Multitouch—Play intervals and chords with up to four voices.
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Fully Offline
No network calls
No Tracking
Zero analytics
Free
No in-app purchases