Circle of Fifths Pro

Learn keys, chords, and harmony with a clear, musician‑first Circle of Fifths.

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

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

🎼 Learn Keys & Harmony
Explore all 12 major and minor keys

Understand key signatures and accidentals

See relative minors, neighbors, and functional relationships

Visualise tonic, subdominant, and dominant families

🎹 Diatonic Chords & Progressions
View diatonic chords for every key

Understand how chords relate within a scale

Explore common progressions and harmonic movement

🎵 Modes & Scales (Ionian → Locrian)
Learn modal patterns and scale tones

Compare modes side‑by‑side

Understand 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 learning, composing, and teaching

Works offline — no ads, no tracking, no data collection

📚 Perfect For
Music students

Teachers and educators

Composers and arrangers

Guitarists, pianists, producers

Anyone learning harmony or improving their musical understanding

🌟 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 explore. Every feature is crafted to support real musical understanding — from beginners learning keys to advanced musicians exploring modulation and functional harmony.