SetClass
Pitch Class Set Explorer
$4.99 · Designed for iPad. Not verified for macOS.
Explore the hidden geometry of chords and scales. Build, transform, and sequence any pitch class set — with theory, sound, and MIDI export built in.
SetClass is an interactive tool for exploring Pitch Class Set Theory — the analytical framework behind atonal and post-tonal music, from Schoenberg and Webern to contemporary composers.
BUILD & HEAR
Tap notes on the chromatic wheel to construct any chord, scale, or pitch collection. Hear it instantly with a jazz piano soundfont or built-in synthesizer.
EXPLORE THE THEORY
• Normal form, prime form, and Forte number for every set
• Interval vector analysis
• Transpositional and inversional symmetry
• Z-relation detection
TRANSFORM
Apply serial operations: transposition (T0–T11), inversion, retrograde, retrograde inversion, and multiplication (M5, M7, M11). Watch the geometry change in real time.
COMPOSE & SEQUENCE
• Sequencer: build rhythmic patterns with serial transformations, arpeggios, swing, gate, and glide
• Melody Generator: create melodic lines with contour control (free, rising, falling, arch)
• Morph: blend smoothly between two sets with optional portamento
• Export to MIDI or MusicXML
FIND & GENERATE
• Set Finder: enter any melody or chord and identify the pitch class set inside
• Generator: produce sets by cardinality, symmetry (mirror, symmetric), and density
LEARN
Built-in theory reference covering pitch classes, normal form, prime form, interval vectors, Forte numbers, transposition, inversion, retrograde, symmetry, Z-relation, set class, morphing, and serial technique — with musical examples from Debussy, Schoenberg, Bartók, Webern, Berg, Stravinsky, and Messiaen.
Available in English, Spanish, French, Italian, German, and Chinese.
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The developer, Martin Adler, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Martin Adler
- Size
- 92 MB
- Category
- Music
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
English and 5 more
- English, French, German, Italian, Simplified Chinese, Spanish
- Age Rating
4+
- 4+
- Copyright
- © 2026 Martin Adler
