The major 3rd on the guitar
4 semitones · M3 · C → E
Its character, in the app's words: confidence; an octave wider (M10), serenity: the affirmation broadens.
The shapes on the neck
- On the same string: 4 frets up.
- On the next string, towards the 1st: 1 fret back; the same fret 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 minor 6th: 4 + 8 = 12 semitones.
The root is the C on the A string, 3rd fret; the other circles are the same note, E, 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