[pinpeliponni]

Yousician (https://yousician.com/). It's like an interactive guitar teacher, offering backround tracks, and evaluating how you play. The really surpsising thing is how well it works.

[maelito]

For me it's like guitar hero (lessons are games) + duolingo (for lesson progression).

It identifies correctly the notes you play, even 1 meter from your laptop's crappy mic.

The free 30 minutes a day roughly corresponds to your fingers' daily tolerance as a beginner.