Util Monster
Free
Select a root and chord quality to highlight its tones, or press keys directly to reverse-identify possible chord names.
Compare common chord qualities such as major, minor, seventh, sus2, sus4, diminished, augmented, sixth, and add9. Changing the root updates both the highlighted keyboard and interval labels, so you can transpose the same structure instead of memorizing only C-position shapes.
Press notes on the keyboard to find chord names with the same pitch-class set. Inversions match the same candidate, while omitted tones and added tensions are not guessed, making the result useful for exact note-set checks.
Play a chord, then repeat the same notes on the piano page or your instrument. For progressions such as I-IV-V or ii-V-I, watch how common tones move between chords to build cleaner voicings.