The minor 6th on the guitar
8 semitones · m6 · C → A♭
Its character, in the app's words: solitude; an octave wider (m13), distant longing: the longing takes distance.
The shapes on the neck
- On the same string: 8 frets up.
- On the next string, towards the 1st: 3 frets up; 4 frets up when you cross from the G string to the B string, which are tuned a major 3rd apart instead of a 4th.
- Turned upside down it becomes a major 3rd: 8 + 4 = 12 semitones.
The root is the C on the A string, 3rd fret; the other circles are the same note, A♭, wherever it sits between frets 0 and 12. The 1st string (high e) is at the top, as in the app. The root is filled.
Open it in the app: 2. Intervals
The other intervals