Before you invest a lot of time and money on developing your idea, validate it!
You can validate your app by doing Market Research and by Identifying Your Target Audience.
Visit the App Store and Google Play and answer the following questions:
Answering those 3 questions will give you valuable insight.
For example, did complaints in the app reviews reveal opportunity for a similar app with an improved user experience? Are users requesting a different feature set than you imagined?
After doing market research revisit your original idea. Capture the new insights gained and to help fine tune the idea to stand out in the marketplace.
Identify your Target Audience
User engagement is key for app success, so identifying the type of people that would be most likely to use your app before you develop it is critical.
Answering the following 3 questions can help you identify the users that would potentially download your app.
Validating your app idea upfront will alleviate the pain of building something that nobody wants.