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About Circle of Fifths Pro

Circle of Fifths Pro is a clear, modern reference tool for keys, chords, scales, and harmony.
Designed for musicians, students, and teachers, it visualises how music fits together — showing key signatures, chord families, modes, and functional harmony with ease.

Whether you're composing, improvising, studying theory, or teaching, Circle of Fifths Pro gives you a fast, intuitive way to explore the structure of Western music.

🎼 Keys & Harmony Reference
• All 12 major and minor keys
• Key signatures and accidentals
• Relative minors, neighbors, and functional relationships
• Tonic, subdominant, and dominant families

🎹 Diatonic Chords & Progressions
• Diatonic chords for every key
• Chord relationships within a scale
• Common progressions and harmonic movement

🎵 Modes & Scales (Ionian → Locrian)
• Modal patterns and scale tones
• Side‑by‑side mode comparison
• How modes relate to each key

🔍 Advanced Theory Tools (Pro)
• Secondary dominants
• Pivot chords
• Modulation paths
• Functional harmony overlays
• Animated transitions for clearer understanding

🎧 Built for Musicians
• Clean, minimal interface
• Fast, intuitive interactions
• Designed for composing and teaching
• Works offline — no ads, no tracking, no data collection

⚙️ Improved Settings & UX
• Settings now update instantly in the UI
• Panel closes naturally — tap outside or tap the button again
• Smoother navigation and more responsive controls

🌍 Now Supporting 28 Languages
Circle of Fifths Pro automatically adapts to your device language, offering a more natural experience for musicians around the world.

📚 Perfect For
• Music students
• Teachers and educators
• Composers and arrangers
• Guitarists, pianists, producers
• Anyone exploring harmony and musical structure

🌟 A Modern Circle of Fifths
Circle of Fifths Pro combines a beautifully designed interface with a modern theory engine to make harmony feel natural, visual, and easy to navigate. Every feature is crafted to support real musical understanding — from beginners exploring keys to advanced musicians working with modulation and functional harmony.