kort

A Synthesia-style learning piano app for macOS and iPad, built with SwiftUI.

Play and practice on an on-screen 88-key piano, follow falling notes in real time, and read along with live grand-staff notation.

Features

• 88-key keyboard — zoomable, scrollable, with optional note-name labels
• Live input — play with the mouse/touch or a connected MIDI keyboard
• Chord detection — recognizes chords you play in real time
• Note waterfall — Synthesia-style falling notes, with chord names shown over groups
• Running music sheet — live grand-staff notation with key signatures, stems, barlines, and rhythmic values
• MIDI import — load a .mid file to listen and practice
• Loop mode — repeat a passage until you stop
• Practice library — scales, chord drills, patterns, accompaniment, arpeggios, and strumming, each graded easy → hard

Requirements

• macOS 26 or iPadOS 26
• Xcode 26

Build & Run

Open kort.xcodeproj in Xcode, then build and run.

Or from the command line:

# macOS
xcodebuild -project kort.xcodeproj -scheme kort -destination 'platform=macOS' build

# iPad simulator
xcodebuild -project kort.xcodeproj -scheme kort -destination 'platform=iOS Simulator,name=iPad Pro 11-inch (M4)' build

Tests

xcodebuild -project kort.xcodeproj -scheme kort -destination 'platform=macOS' test

License

Released under the MIT License.