5thsFlow - Circle of 5ths

Stop guessing, start hearing. Every chord, mode, and key — tap it, hear it, understand it. Music theory finally makes sense.

5thsFlow is an interactive Circle of Fifths built for musicians, songwriters, and producers who want to understand music theory — not just memorize it.

Tap any key on the wheel and instantly see its 7 diatonic chords, 7 modes, key signature, and relationships to every other key. Hear everything played back in real time with a warm, piano-style tone.

EXPLORE ANY KEY • All 7 diatonic chords with Roman numerals, chord function, and quality • Toggle between major and relative minor — see Am as i, F as VI, and so on • 7 modes arpeggiated so you can hear their character: Dorian, Phrygian, Lydian, and more • Key signature, scale degrees, relative minor, dominant, and subdominant at a glance • Transpose up or down by semitone without losing your place

CHORD VOICINGS & EXTENSIONS • Switch between Triad, 7th, Sus2, Sus4, and Add9 voicings for every chord • Hear exactly how extensions change the feel of a chord — from open and suspended to rich and jazzy • Borrowed chords from the parallel minor shown in every major key — modal interchange made visual and playable

BUILD PROGRESSIONS • Add chords from any key into a sequencer • Set your BPM, toggle loop mode, and play it back • Save named progressions and reload them any time • Works across keys — mix chords from different keys in one progression

FIND YOUR KEY • Know your chords but not the key? Tap them in and matching keys appear instantly • Or hold your phone up to an instrument — the mic detector listens and ranks the most likely keys by confidence in real time

SOUNDS GREAT • Block or Strum chord playback style • Play the classic I–IV–V–I progression or the i–VI–III–VII minor progression with one tap • Haptic feedback that matches chord quality — major, minor, and diminished each feel different

Whether you're a beginner learning which chords go together or a working musician who needs a fast reference on stage, 5thsFlow is the fastest path from question to answer.

Designed for iPhone and iPad.