But the vitriol of the grandparent-comment seems uncalled for. Computers/phones/etc are not some sort of evil presence that infect everything they touch, and apps like this can have their place too. In the right context, they might do a lot of good.
[E.g. I love various simple "sounds of rain" apps on my phone -- they can reallllly help me concentrate when I'm trying to study in a cafe and the background noise is somehow putting me off. It's like a blanket of calm...]