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.