Circle of Fifths Pro is a musician‑first tool for understanding how music fits together. Whether you're learning harmony, composing, improvising, or teaching, the app gives you a clear, intuitive way to explore keys, scales, modes, and chord relationships. Built with a clean interface and a modern theory engine, the app visualises the structure of Western music in a way that feels natural and immediately useful. Every interaction — from selecting a key to exploring harmonic movement — is designed to support real musical understanding. Circle of Fifths Pro stays out of your way so you can stay focused on learning, creating, and practicing. Free Features (Beginner Mode) A simple, accessible introduction to the circle: Interactive Circle of Fifths Major and minor keys Relative and parallel relationships Basic key signatures and tonal centers Clean, minimal interface No ads, no tracking, no data collection Perfect for beginners learning how keys connect. Pro Features (Intermediate + Advanced Modes) Unlock the full harmony toolkit for deeper study, teaching, and composition: Mode Explorer Ionian through Locrian Scale tones, interval patterns, and modal structures Clear visual layouts for fast learning Chord Families Tonic, subdominant, dominant Diatonic chord mapping for every key Modal interchange and harmonic movement Key Signature Breakdown Sharps, flats, and enharmonic equivalents Relative major/minor connections Diatonic Chord Strip See diatonic chords for any selected key Tap to hear each chord instantly Playback Tools Play individual diatonic chords Play I–V–vi–IV progressions Playback styles: Block, Up, Down Advanced Harmonic Overlays Secondary dominants Pivot chords Modulation paths Color‑coded legend for quick understanding Ideal for students, educators, composers, producers, and improvisers. Why Musicians Choose Circle of Fifths Pro Fast, intuitive visual learning Beautiful, modern design Powerful tools for all skill levels Perfect for practice, teaching, and composition Privacy‑First No ads No tracking No data collection All theory processing happens locally on your device Circle of Fifths Pro collects no personal data. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.bamuda.com.au/circleoffifthsproprivacy.html