SetClass
Pitch Class Set Explorer
฿199.00 · Designed for iPad. Not verified for macOS.
Also Included In
Explore pitch class sets with Forte numbers, prime forms, K/Kh complexes and a new Serial Matrix. Search all 224 set classes by notes, Forte number or pitch classes.
Explore the building blocks of modern harmony. This app lets you see, hear and manipulate pitch class sets, the foundation of post-tonal and atonal music theory.
EXPLORE
• Tap notes on the pitch wheel to build any chord or scale.
• See the Forte number, prime form, normal form and interval vector.
• Check transpositional and inversional symmetry.
• Open the K/Kh complex of any set to see which set classes include it or its complement.
FIND
• Tap notes on a keyboard, or type a Forte number (3-11, 6-Z44) or pitch-class numbers (0 4 7).
• Browse all 224 Forte set classes, with Z-relations, filtered by size.
TRANSFORM
• Transpose, invert and multiply (M5, M7) any set.
• Morph smoothly from one set to another.
CREATE
• Generate sets by cardinality, symmetry and density.
• Arrange sets into rhythmic sequences using P, T, I, R and RI operations, with every inversion level.
• Build a serial matrix from rows of 2 to 12 notes.
• See each set as geometry in tonal space, with symmetry axes.
• Export to MIDI and MusicXML.
LEARN
• A built-in theory guide.
• Analysis examples from Debussy, Schoenberg, Stravinsky, Berg, Messiaen and more, with links to scores.
Built for students, composers and theorists, from first-time learners to advanced analysis.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
• Set Finder: no more 20-result limit. Every matching set class is now listed.
• Set Finder: new note picker. Tap notes to search instantly, or type a Forte number (3-11) or pitch-class numbers (0 4 7).
• Set Finder: with no notes selected, it now lists all 224 set classes (filter by size with the note-count chips).
• New: K/Kh complexes. Open any set in Explorer to see the set classes that include it or its complement.
• New: Serial Matrix in the Sequencer, for rows of 2 to 12 notes. Read P, I, R and RI forms straight from the grid.
• Sequencer: every step can now use any inversion (I0–I11) and retrograde inversion (RI0–RI11).
• Geometry: inversional symmetry axes are now drawn on the shape.
• The settings button is now a gear and the sheet is called Settings.
• Thanks to everyone who sent feedback!
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
- Provider
- Martin Adler
- Size
- 92.1 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
