Extremely Useful
I was having a problem with interference on both the 2.4GHz and 5GHz bands in my house. After lamenting to a friend of the frustructions I experienced trying to hand map things out, they recommended I check out this app. It does exactly what I need it to do, is easy to use, and has a lot of really nice visualisations to help put crowded bands and channels into an easily digestable form. Very happy with this app.
viciousprimate about
WiFi Explorer: Scanner