Is there any kind of apps that has not been made?

Been developing apps/games since 2009. Back then, devs came up with
ridiculous ideas to make app. Apps like iFart, Car Remote (that dont work),
iBeer, and so on. There were great apps made too, of the early years, like
Color Splash, Pocket God, Skee Ball, and so on.

Today, 2016, there are literally millions of apps in the appstore.
Pretty much every apps has been made. "There is an app for that".

So I am wondering what kind of apps that has not been made? More
importantly what kind of apps that is much needed, but nobody has ever
made it?

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Is there any kind of apps that has not been made?