There’s plenty of video games that do this going back to 2003’s Karaoke Revolution - if not earlier. Plenty of other games and series followed suit including as

There’s plenty of video games that do this going back to 2003’s Karaoke Revolution - if not earlier. Plenty of other games and series followed suit including as Rock Band, Guitar Hero, Lips, SingStar. There’s plenty of mobile apps that work similarly. AFAIK they basically track your pitch and timing. I remember Lips in particular rewarding vibrato as well. The algorithms as I understand them are grading you based on sustained pitch (adjusting for octave) and cadence. Generally they are easy to fool - you can basically say gibberish but as long as it’s within the expected parameters you’ll still get a good score. They are still rather fun though if you enjoy that sort of thing.