I don't normally chime in on stuff like this but you're right it does look alot like Noisli (http://www.noisli.com/) I remember when that appeared on HN a while back as well. Nothing wrong with cloning something on your own for fun but it seems like they didn't disclaim this anywhere?

Evidently this app is extremely similar to Noisli, Noizio and ASoftMurmer. Nothing unexpected, but certainly it seems that these four apps all share a very similar design aesthetic. Would be interesting to see who was first to the punch - presumably Noisli.

This one seems as though it has more sounds available, but that's definitely still not an excuse.

I must have missed the post about noisili. This is very cool, thanks for bringing this up.