Chord ai uses recent advances in artificial intelligence to give you the chords and beats of any song automatically and reliably. You won't need anymore to look for the chords of a song on the web. Chord AI listens to the music played from your device or around you and shows you the chords instantly.
In its basic version, Chord AI is able to recognize the following chords: 
- major and minor
- augmented, diminished
- 7th, M7th
- suspended (sus2, sus4)
In the Pro version that you can get with just a one-time in-app purchase, Chord ai can recognize thousands of advanced chords using the latest advances in the field of machine learning such as:
- power chords
- half-diminished, dim7, M7b5, M7#5
- 6th, 69th, 9th, M9th, 11th, M11th, 13th, M13th
- add9, add11, add#11, addb13, add13
- 7#5, 7b5, 7#9, 7b9, 69, 11b5, 13b9,
and combinations of the above! (such as 9sus4, min7add13 etc.)
In addition, Chord ai Pro is able to detect chord inversions such as C/E where the third (E) is played as the lowest note, or Am7/G where the seventh (G) is played as the lowest note.
For guitar and ukulele players, Chord ai also comes with a massive library of chord positions.
Chord ai even works offline. You don't need to have an internet connection (unless you want to play a song from YouTube or a streaming service).
How does Chord ai work? Chord ai can find the chords of a song in two ways:
1) For audio files that you have on your device or iCloud, YouTube videos, SoundCloud songs, Chord ai will process the song in a few seconds to give you all the chords of the song at once
2) Through your device microphone. Any song playing around you, or played by your device from a streaming service, is analysed with your device microphone and the chords of the song are shown in real time. You can go back in time and replay the song together with the chords displayed on a timeline.
Regarding the 17+ age restriction: This is simply enforced by Apple for any application which lets you browse YouTube videos freely.
Any feedback appreciated at contact@nomadai.org