Chordify

Dutch app that auto-detects chords from any song or video and creates instant play-along charts for practice and repertoire building.

Best for: Players learning songs fast by ear-plus-chart.
Skip if: You read real charts already or recognize chords by ear.
First move: Chordify one song you've always wanted to cover. A free account lets you get 4 free songs per day and is a great starting point to test out if you want to use or pay for the app.
Watch out: Commercial advertising at the Basic tier can interrupt the experience.
Reach: Established
When: Useful from day one.
Based in: Netherlands