Hi everyone! I’m an indie developer and a music enthusiast. I recently built a little tool called Circle of Fifths — an interactive circle of fifths that helps you understand keys, chords, and modulations in a more intuitive way.
When I was learning music theory, I always found static charts too abstract. You can’t hear them, and they don’t really help you feel how keys are connected. So I decided to make one that actually moves — clickable, audible, and visual.
Main features:
  • Click any key to see its key signature, scale, and functional chords.
  • Hear every chord or scale instantly with real-time playback.
  • Explore common chord progressions like I-V-vi-IV.
  • Watch how keys relate and modulate through a rotating visual circle.
It’s perfect for:
🎓 music students,
🎹 composers and songwriters,
👩🏫 teachers who want a better classroom demo tool.
No login, no ads — just open and use. I hope this tool helps more people feel music theory instead of memorizing it.
👉 circle-fifths.com