Ultimate Guitar : Chords (often shortened to UG Chords) is a website and mobile app that provides a vast library of song chord charts (and other musical information like tabs) for guitarists and other musicians. It[SQ]s a crowdsourced platform, meaning users contribute and edit the chord charts. While this can lead to some inaccuracies, the sheer volume of content makes it a popular resource for finding chords to a huge range of songs. The site and app are free to use, but they also offer a premium subscription to remove ads and access additional features.