How Does Karaoke Scoring Actually Work?

A karaoke score feels like magic until it gives you a number you disagree with. Knowing how it is built makes it useful: you can see why a line scored low and what would raise it. This is how scoring works in Autunes Karaoke.

While you sing, the app measures the pitch of your voice many times a second, right in the browser. Pitch is measured in cents: 100 cents make one semitone, the step between two neighbouring piano keys. Being 10 or 20 cents off is hard for most listeners to hear; 50 cents off sounds clearly out of tune.

The melody of the song is measured the same way from the original vocal, so both sides are compared on the same scale.

Each moment of your singing is compared with the melody at that moment. A small timing window lets a note count if you arrive a fraction of a second early or late, because nobody sings exactly on the grid. The app also lines your take up against the song's own timing, so the small audio delay every phone and laptop has does not look like late singing.

A song written for a high voice should not punish a low one. If you sing an octave below or above the original, the notes still match. If you sing the whole song a few semitones up or down, in a key that suits you, the score follows you as long as you stay in that key.

What the score does not forgive is drifting: starting in one key and wandering into another, or letting long notes sag.

Every lyric line gets its own score, and the song total is built from the line scores. This is deliberate. A single total cannot tell you what to practise; line scores can. When the song ends, your weakest lines are listed with the spot where the pitch slipped, so you can replay exactly those lines.