This app is automatic chord detector (chord finder) that uses the internal device microphone
It also has some unique features as showing the music spectrum so you can actually see the notes in it.
So ZAX can be used not only as a chord detector but also to show any instrument timbre. It shows all notes that are available as a frequencies in the sound. Basic tempo detection ( BPM detector) is also added to help you find the BPM for your song.