Listening notes / Interval practice
Hear the same distance in three ways
Separate pitch direction from the size of the gap.
Ascending mode plays a lower note followed by a higher one. Descending mode plays a higher note followed by a lower one. Harmonic mode starts both tones together. The answer choices name the absolute semitone distance in each case.
Compare a familiar pair
In the reference panel, choose C4 and Perfect fifth. Ascending gives C4 then G4. Descending gives C4 then F3. Harmonic sounds C4 and G4 together. The common distance is seven semitones, but the order and the combined sound differ.
Keep the setup explicit
A mode change in the setup applies to new questions after Save setup. An unanswered question replaced by a new setup is recorded as skipped. The reference panel has its own mode selector, so it can illustrate a different presentation without silently changing your practice setup.
A limited pitch system
This app synthesizes twelve-tone equal-temperament pitches using A4 = 440 Hz. It uses conventional names for simple semitone distances from one through twelve. Tritone names the six-semitone distance. It does not analyse a score, key or enharmonic spelling, where the same sounding distance can have a different written interval name.
The on-screen numbered strip is a distance diagram, not staff notation or a playable piano.