Listen, sing it back in your head, then reveal the answer.
The answer: 1 – 2 – 3 – 4 – 5 – 6 – 7 – 8
This app does not replace a teacher. It is an aid that supports ear training: it makes practice measurable, makes repetition unlimited, and shows where you went wrong as a number. It does not measure timbre, expression, breath or musicality — the things a human hears — and never claims to.