5/5 rating based on 50 reviews. Read all reviews for Octave RTA for iPhone.
Octave RTA is paid iOS app published by ONYX 3
Musicinstructor
This app works excellent on my iPhone 6 w/ iOs 8.3. The layout is wonderful and it seems relatively accurate. I run a budget live sound company and this app is exactly what I need. Not too much, not too little. No option to change colors of the display, but I'm happy with the look, so it works well for me.
Diggitae
It is hand held. Not as accurate as having a specialized device with a mic, but on the fly, it is the best.
RJL1
This app works as well as my $400+ sound analyzer and is much easier to carry and set up. If you work with sound and need to get rid of a little ring or multiple harmonic blends, this app will help.
AdamL15
So far it seems like an awesome app! Very useful for finding feedback. One great addition would be a simple sine wave tone generator so the user could hear the specific tone that they are looking at to see if it is truly the problem spot. Otherwise it's great!