Music / Tune the harmony.
Pitch & Harmony
Note frequency, semitone transposition, chord progressions, and circle-of-fifths reference for r/musictheory and r/WeAreTheMusicMakers.
4 tools available
Note Frequency Calculator (Hz ↔ Note)
Convert any frequency to its nearest equal-temperament note and back.
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Semitone Transpose
Transpose any root note up or down by N semitones.
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Chord Progression Builder
Build a Roman-numeral chord progression from a key and see the diatonic chords.
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Circle of Fifths Explorer
See the key signatures, relative minors, and sharp/flat counts for every key.
Open tool