NOW AVAILABLE ON THE APP STORE

Four Notes.
Infinite Color.

Step into the 4th dimension of modern jazz harmony. Tetratonics reveals the secret behind contemporary voicings — take a triad you already know, add one carefully chosen color tone, and instantly unlock lush, sophisticated harmony.

CΔ7(9/♯11/13)
Result: a complete jazz chord symbol, decoded in real time
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iOS 17+ iPhone & iPad 100% Offline No Subscriptions
THE CORE SYSTEM

10 Curated Structures.
Every One a Gem.

Not all "Triad + 1" combinations are created equal. Tetratonics curates the 10 highest-value structures used in contemporary jazz — meticulously optimized for harmonic beauty and functionality. Every combination sounds incredible.

MAJOR-BASED
MINOR-BASED
C(♭2)
C · D♭ · E · G

Tap any chip above to see its 4-note pitch array

Each structure is a major or minor triad with one carefully chosen color tone added. If you know your triads, you're already fluent in the system.

THE HARMONIC VISUALIZER

See Your Harmony
Come Alive.

Our stunning 12-tone chromatic ring maps how your chosen tetratonic structure relates to the underlying chord. Notes form unique geometric shapes that reflect intervallic relationships in real time.

Core Tones (1, 3, 5)
Guide Tones (7ths)
Natural Extensions (9, 11, 13)
Altered Tensions (♭9, ♯11, ♭13)

Tap any valid note on the chromatic ring to smoothly pivot your starting point. The geometry updates instantly as the tetratonic polygon reshapes itself.

CΔ7(9/♯11/13)
D(2) over C△
INSTANT CHORD TRANSLATION

Drop a Structure.
Read the Result.

Our proprietary analytical engine decodes every tetratonic superimposition into a perfect, standard-compliant jazz chord symbol. The intelligent engine knows when an interval functions as a ♭5 versus a ♯11 — and outputs the exact right notation.

FΔ + A–(2) =
FΔ7(♯11)

Classic Lydian sound — A minor tetratonic with 2nd, starting on the major 3rd

E–7 + F♯–(♭2) =
E–7(9/11/13)

Lush minor sonority from a single superimposed structure

G7 + C♯(♭2) =
G7(♭9/♯11)

A powerful altered dominant with deep harmonic tension

E–7♭5 + A(♯2) =
E♭–7♭5(♭9/13)

A dark, complex half-diminished sound generated instantly

DESIGNED FOR MUSICIANS

Every Feature Built
for Creative Flow.

Harmonic Visualizer

A stunning 12-tone chromatic ring maps every pitch relationship geometrically. Watch your tetratonic polygon update as you explore.

Flawless Enharmonics

Over flat roots you see flats. Over sharp roots you see sharps. Every single pitch is spelled correctly, every time.

Favorites Library

Save killer voicings with a single tap. Group by Chord Type, Tetratonic Type, or Date. Build your personal harmonic vocabulary.

Adaptive Layout

Portrait for pocket reference on the bandstand. Landscape for the full analytical workstation view. The interface breathes with your context.

Strictly Offline

Zero ads. Zero subscriptions. Zero data collection. Runs entirely locally on your device. Your creative tools, fully under your control.

Smart Context Awareness

Change your chord root or quality and Tetratonics instantly recalculates valid starting points — displaying only combinations that sound musically coherent.

Liquid Glass Aesthetic

A premium dark mode with glassmorphic interfaces and subtle depth. Designed to preserve your vision on lit stages and dark practice rooms.

Haptic Touch

Tuned tactile feedback connects every physical touch to a harmonic exploration. The app feels alive in your hands — like a high-end piece of gear.

THE CONTROL ISLAND

A Tactile Interface
for Quick Exploration.

The Control Island puts your 10 master archetypes at your fingertips. See your tetratonic formula and the resulting musical pitches side-by-side — a clear, always-readable reference right where you need it.

Starting point chips glow in their harmonic color — sapphire for core tones, emerald for guide tones, amber for natural extensions, crimson for altered tensions. The color tells you exactly what you're playing before you play it.

G7 + C♯(♭2)
C♯ · D · F · G♯
STARTING POINT
G 1
E 13
B♭ ♯9
C♯ ♯11
TETRATONIC TYPE
♭2 2 ♯2 4 ♯4 ♭6 –♭2 –2 –4 –♯4
THE APP IN ACTION

Built Like High-End Gear.

Every screen, every interaction, every detail — crafted to feel premium.

Tetratonics landscape workstation view — B♭7 with E–(♯4) tetratonic

Landscape: B♭7(♭9/♯11/13) via E–(♯4) — Full Workstation View

Tetratonics landscape view — E-7(9/11/13) via F#-(b2)

Landscape: E–7(9/11/13) via F♯–(♭2) — Light Mode

Tetratonics A♭ major with C–(2) tetratonic in landscape mode

Landscape: A♭△7(♯11) via C–(2) — Full Workstation View

SEE IT IN ACTION

From Triad to Voicing
in Seconds.

Watch how quickly you can move from a basic chord to a lush, fully analyzed jazz harmony.

Real-time harmonic analysis

Chord root exploration

WHO IS THIS FOR

Built For Musicians.

Improvisers

Build a vocabulary of tetratonic structures you can superimpose in real time. Know exactly what harmonic color you're adding before you play the note.

Composers

Discover unexpected harmonic colors by systematically exploring every tetratonic-over-chord combination. Save your discoveries for your next session.

Arrangers

The Analytical Chord Symbol Engine gives you the precise, standard-compliant notation for every combination. Copy it straight into your score.

Students

The visual ring makes intervallic relationships concrete and immediate. See why a ♯11 sounds the way it does — watch the geometry tell the story.

Tetratonics App Icon
TETRATONICS – THE 4TH DIMENSION

Discover a Lifetime of
Modern Harmonic Color.

Available now on the App Store. No subscriptions. No ads. Just pure, beautiful harmony — everywhere you go.

Download on the App Store
iOS 17+ · iPhone & iPad · 100% Offline · No Subscriptions