Im not sure about the validity of binaural tones, but I use them anyway. Placebo effect, right? This app has only preset tones, which is something I like. It also has preset run times( I think 5, 10, 15, 30, 60 & infinity minutes), which saves on toying around to get the exact amount of time you want the app to run. The biggest negative Ive found with the app is that it crashes on the second use. Download it and open it, it works fine. Next time you open it, it immediately crashes and continues to do so on each try thereafter. I found that if you move the icon into a folder, itll work again, but only once. That is how I use it. I use it, then next time move it to a new folder, then the next time I move it back to its original spot, and so on. Kind of annoying, but not the end of the world. A second negative is that the ambiance sounds (waves, birds, etc) need to be downloaded separately and that they are all in one pack that takes ->forever<- to download. I dont use em, but the app pesters you to download them until you do. That is obnoxious.
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