VERSION 2.0 — NOW 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 color tone, and now perform lush, sophisticated harmony with the dual-voice Sound Studio.

CΔ7(9/♯11/13)
Result: a complete jazz chord symbol, decoded in real time
Download on App Store Explore Features ↓
New: Version 2.0 iOS 17+ iPhone & iPad 17 Instruments 100% Offline No Subscriptions
THE SOUND STUDIO  NEW IN 2.0

The Laboratory Goes Live.

Tetratonics was built as a harmonic laboratory. Now the lab has a stage. The Sound Studio turns your chord analysis into a two-voice performance — with 17 curated instruments, professional voicings, and real-time control.

Harmony Layer

10 curated timbres · Context-aware chord intelligence · Drop 2, Drop 3, Shell voicings · Strum articulation · 4 velocity contours

Melody Layer

7 curated timbres · Drag-to-order sequencer · 7 melodic gestures (Arc, Pendulum, Resolve) · Feel slider

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 & Waveform Animations

Tuned tactile feedback syncs with every note trigger. Targeted waveform animations isolate playback to the active voice — the app feels and looks alive, like a high-end piece of gear.

The Sound Studio NEW

A glassmorphic command center for your audio. Assign 17 gain-staged instruments to two independent voices, shape articulation with professional voicings, and sculpt the feel — all in one place.

Pro-Audio Engine NEW

Zero-latency dual-sampler on AVAudioEngine. Industrial-grade session resilience survives phone calls, Siri, and headphone changes without dropping a beat. Perceived-loudness parity across all instruments.

THE SOUND STUDIO  NEW IN 2.0

From Calculator
to Canvas.

Tetratonics is no longer just a visualizer — it's a premium, dual-voice instrument. The Sound Studio puts full performance control at your fingertips: timbre, voicing, articulation, feel.

Sound Studio Tetratonic tab — drag-to-order sequencer, 7 melodic gestures, and Feel slider

Shape the melody.

Assign one of 7 curated timbres to your 4-note scale, then decide exactly how those pitches are delivered.

  • ↕
    Drag-to-Order Sequencer
    Reorder pitches into custom melodic licks via drag-and-drop. The grid updates in real time.
  • ◯
    7 Melodic Gestures
    Arc, Pendulum, Resolve (Up & Down), Ascending, Descending, Block — each with a unique musical shape.
  • ≈
    Feel Control
    One slider spans Drifting → Flowing → Walking → Driving → Rushing. No milliseconds. Just music.
Sound Studio Chord tab — professional voicing library, articulation and dynamics controls

Sculpt the harmony.

A context-aware engine listens to your scale and automatically selects the correct voicing — no dissonance, no wrong notes, ever.

  • ♯
    Harmonic Intelligence
    The chord pad auto-adjusts to match your scale's tensions — adding a sharp-five exactly when the tetratonic requires it.
  • ≡
    Professional Voicing Library
    Root Position, Drop 2, Drop 3, Shell (Root+7th), Cluster — industry-standard jazz voicings, one tap away.
  • ∼
    Articulation & Dynamics
    Strum Up, Down, or Block. 4 velocity contours: Flat, Rise, Fall, Root Accent. Dial in the exact feel.
Sound Studio instrument picker — 17 curated instruments with perfect loudness parity

Perfect the balance.

17 gain-staged instruments, two independent channels. Switch timbres without ever touching the volume knob.

  • ≃
    Two-Axis Normalization
    Every instrument is calibrated for velocity and gain — perfect perceived-loudness parity across all 17 presets.
  • ⊕
    Independent Channel Faders
    Blend chord and tetratonic layers independently. Push the melody forward or let the harmony swell.
  • ✧
    Favorites Audio Preview
    Audition saved voicings directly from your library — hear exactly what you'll get before loading it.
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 — full analytical view with audio controls

Landscape: Full Workstation Mode with Audio Engine

Tetratonics chord root selector — all 12 keys at a glance in landscape mode

Landscape: Chord Root Selector — All 12 Keys

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