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 update instantly in the UI

Panel closes naturally — tap outside or tap the button again

Smoother navigation and more responsive controls

🌍 Now Supporting 29 Languages
Circle of Fifths Pro now includes full support for Traditional Chinese, bringing the total to 29 languages.
The app automatically adapts to your device language for a more natural, global experience.

📚 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.