Most apps do not fail because the code was bad. They fail because not enough people wanted them. The good news is that you can test demand in a few hours, before you write a single line of code.
1. See what people already search for
Open the App Store and type your idea into the search box. The suggestions that appear show phrases people really type. Note the top results, how many ratings they have, and when each was last updated. A crowded results page means demand exists. A page full of old, neglected apps can mean an opening.
2. Read the reviews of the leading apps
Read the one-star and three-star reviews of the top three or four apps. Repeated complaints such as “too many ads”, “too complicated” or “no offline mode” are a free feature list. If five different users ask for the same thing, it is worth taking seriously.
3. Define your gap in one sentence
Finish this sentence: “Unlike existing apps, mine is ______ for ______.” The gap might be simpler, faster, available in another language, or built for a specific group of people. If you cannot fill the blanks, the idea is not ready yet.
4. Sketch the three screens that matter
Draw the first screen a user sees, the main action screen, and the result screen. Paper is fine. Show it to five people from your target group and ask what they think each screen does. Where they hesitate is where the design needs work.
5. Decide how the app will earn
Think about this early. Daily-use apps often suit subscriptions. Occasional-use apps may suit ads or a single purchase. If you cannot see a believable way for the app to earn, adjust the idea before building. Our guide to app monetization models explains the options.
6. Set a stop rule
Before you begin, decide what result would make you stop or change direction. For example: “If fewer than a handful of people from my target group say they would use it, I rethink the idea.” A stop rule protects your time.
What this does not do
None of these steps guarantee success. They reduce the chance of building something nobody needs. At Marberx we follow a similar process for our own products. If you want to learn it with a real project, see the App Development course.