Here’s a game you can play. Think of the most random app idea that you can come up with and see if it exists on the app store already. Chances are that some variation of what you’ve come up with already exists.
This is great news, it means that whenever you think of something in your life that’s not perfect, you can probably go get an app for it. The part that sucks is that it can seem like there’s nothing left to make and so your hopes of app fame are crushed.
Well, it was only a couple of years ago that people said that phones without buttons would never work either.
If what you want doesn’t exist yet, great – go make it. I’m constantly surprised when I go into the app store and find something along the lines of what I was looking for. In that case, download it, read the reviews for ideas and find 22 ways to make it even better, then go make it.