​Once you have thought of an idea for your app, the next thing that pops up in your head is, “What is it going to cost me to develop this app?” The cost of your app is going to be dependent on the project size and its technical complexity. 

Project Scope

There are generally three categories of apps: small, medium and large apps.
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Small Apps are typically:

• Built for a single platform
• Have limited functionality
• Have fewer screens

They ideally do not require a login or a user authentication. For example, a weather application comes under the category of small apps. 

A number of apps have stormed into the app store since the past decade. Most of them have tough competition in their own genre. The trick to make your app outstanding is to make it different! 

In today’s competitive age, 35% of the users engage on an app less than a minute. If they find an issue in the functionality, the app gets immediately uninstalled. Hence, it is very important to keep your best functionality forth, so that it keeps the user engaged.
Source: https://www.marketwatch.com/press-release/one-third-of-mobile-app-engagements-last-less-than-one-minute-2014-07-17

So, the question most developers think about is, “How do you make your app successful?” To get an answer to this question, you need to answer questions such as, “How do I make my app appeal to the users?”; “What problem is the app solving for the users?”; “Is the app easy-to-use?”

Let’s take a look at 5 reasons that an app might fail and how to avoid them:
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Researching the Market and the Audience Correctly:
You might have an amazing idea in your head about an app but that doesn’t mean that it will work. There are a lot of criteria that you need to keep in mind before taking the leap and starting work on it. If a developer makes an app solely on their needs, they are most likely to end up with a failed product.