Great set of tools!

I use These apps with the iO interface 2 on my iPhone. I took time to compare various output data directly with my long time existing measurement system (EASERA, laptop and RME FFUC) and while a few of the calculations seem to not behave, most of the data is totally great. Studio 6 seems to be very busy improving the apps all the time and given the very low cost and exceptional convenience, I very highly recommend AudioTools and the interface! I may get the i test mic also. I use this gear professionally in my acoustical consultancy... Not on all projects but much of the time these days!

Rob Farion about AudioTools - dB, Sound & Audio, v6.0