[nocnyptak]

I sometimes experience problems with E7 too. However, I always thought it was my instrument rather not app. It is important to pay attention to fret 1 because if you press too hard it may change the pitch and recognition fails (the same way note pressing it lightly, ie not hard enough).

Perhaps one of our top ukulelists would be able to advice on this topic.

[djsirena]

I thought about that too as I've had that happen a few times. However, I tried several ways of pressing the strings, and many different positions, and amounts of pressure, and occasionally I would have an E7 chord turn green.