I've an idea for a smartphone game app. I want to make sure nobody has made an app like this before; how can I check that? I don't want to remake something that already exists now.
Unless an existing app already dominates the market such that it creates an insurmountable barrier to entry (which is rare), it doesn't matter.
Besides, if you have an idea for an app that you think is truly unique and you can't find any prior examples, it might just be a bad idea. Competition helps provide market validation.
In any case, the idea isn't important. Your success will be defined by identifying customer needs and executing, not by having a great idea.
Not sure how to respond to this. Just search for it.
Unless you have magical powers, your best bet will always be a Google search with keywords that reflect your app. Of course, whether or not someone has already made one isn't as relevant as questions like the following:
- Is the existing app really popular?
- Is the existing app really good?
If the answer to at least one of those questions is no, then you should go ahead with your app! If the answer to both, however, is yes, you should come up with a different idea.