Singing trainer
Write a line on the keyboard, then sing it back one note at a time. The mic checks your pitch and a needle shows how close you are. Sound is analyzed on your device and never leaves it.
Write your line
Tap keys to add notes, up to sixteen. Tap a note in the line to remove it.
Microtones
Notes between the keys. Arm an offset and the next keys you tap land that many cents off.
Sing it back
Pitch counts, rhythm doesn't. Hold each note steady until it locks, then the next one lights up in the line above.
Strictness
How close counts as in tune.
Any octave
Sing the line where your voice is comfortable.