To quickly see which quality the chord has and if the chord is within the current key, the app has an "Out-of-key indicator". You will find the indicator next to the chord:
The inner-circle shows the quality (major, minor etc.) of the chord indicated by the circle's color. Read more about colors.
The outer-circle shows how many tones of this chord are out of the key. For each tone that is not in key, you will see a little dot placed on the outer-circle.
You can see them also in the app under "General information".
Tap in this icon to reveal even more information about the chord or the chord suggestion.