The OP made the point that it was a commodity app. He didn't claim earthshaking originality.
He was proud of his superior execution and baffled at rejection.
Thank you so much for pointing this out, apparently a lot of people missed this point. The topic of this discussion shouldn't be setting out to prove that the OP was not the first to bring this kind of app to the table, but rather how (un)justified it was to be rejected.