Touch Tonnetz

Strategic Code LLC

In-app purchases

About this app

Touch Tonnetz visualizes Neo-Riemannian music theory through the Tonnetz (tonal network) lattice. Tap any chord or note to hear it, see its Neo-Riemannian transformations, and explore harmonic relationships that go beyond traditional tonal progressions.

Key Features:
Interactive Tonnetz Visualization — Tap any chord or note to hear it and see its Neo-Riemannian transformations highlighted on the lattice
Harmonic Analysis — Roman numeral overlays for any tonic, updated in real time
Progression Builder — Create, save, and play back melodic progressions
Custom Chords — Build and save your own chords for experimentation
Three Instrument Sets — Piano, Brass, and Woodwinds, all high-quality samples
Six Color Schemes — Three dark, three light
Pinch to Zoom — Explore the lattice in detail at up to 4× magnification
7-Day Free Trial — Full access, no restrictions, no nags

Perfect For:
Composers looking for harmonic paths outside conventional progressions
Music theorists studying Neo-Riemannian transformations
Musicians experimenting with chord voice-leading
Students exploring music theory hands-on

What is Neo-Riemannian Theory?
Neo-Riemannian theory is a branch of music theory that studies relationships between major and minor triads using transformational geometry. Rather than treating chords as functions within a key (tonic, dominant, etc.), it focuses on the small voice-leading moves — Parallel, Leading-tone exchange, and Relative — that connect one triad to the next. The result is a rich map of chromatic harmony that complements traditional tonal analysis.

Why Touch Tonnetz?
The Tonnetz lattice makes these relationships spatial: related chords are neighbors, and transformations are visible paths. Touch Tonnetz lets you see the lattice, hear it, and build with it — turning an abstract theoretical framework into something you can explore by ear and by hand.

What’s new

Version 4.1 builds on our completely new labelling rework from 4.0, updating font sizes to make the greater amount of information easier to see on small screens.