No, it is called RTA Audio and it is by New Ball s r o
If you search the apps store for RTA there are two versions, a free one with in app purchases and a paid version. For some reason the free version is called RTA Audio Pro but it has fewer frequency bands 1/2 octave steps, the paid version has 1/96 octave resolution. There are other analysers available but from what I can see some of them specialise in clever displays over usability.
Room treatment is about what you can hear, it can be done objectively but a domestic room just won’t be used in the same way as the spaces I use. All you need is your ears, an analyser simply helps to confirm what you are hearing. Just run the app before you add curtains (curtains open) and then do the same with them closed. Your ears will tell you if it sounds better, the analyser will give you an idea of what you have done.
If the room is bright, bass is subdued and top end over active, the app may give you an idea of how much you can dampen the room i.e. curtains, heavy curtains, heavy lined curtains, wall hangings, rugs, carpet, heavy carpet, resort to headphones etc. Ears first though, every time.
I should have asked earlier, what do you think is “wrong” about your room?
I could comment but I haven’t heard your system, there’s no point in measuring anything if you can’t articulate what you are unhappy with. I don’t mean writing it down, I mean that you should identify the perceived problem any get an idea in your own mind as to what you want.
I have edited this post to remove unnecessary references to tools you don’t need.