From 17+ years of hands-on engineering · 8 min read
What to Prepare Before Building an iOS or Android App
A mobile app is not automatically the next step for every business. It is valuable when people need a repeated task, device capability or focused experience that a normal website cannot provide well enough. Planning that reason first protects the budget and leads to a smaller, stronger first release.
In this guide
Explain why this needs to be an app
Start with the user situation. They may need offline access, notifications, camera input, location, a quick repeated workflow or a smoother signed-in experience. If the main need is reading public information occasionally, a good mobile website may be simpler for users and the business.
Write one sentence describing what a successful user repeatedly accomplishes in the app. That sentence helps remove features that belong in a later release or an administrative web portal.
Choose the first users and core journey
Different users often need different products. Customers, field staff, managers and partners may share data but perform separate tasks. Trying to serve all of them in the first version creates a large navigation and complicated permissions before the main idea has been tested.
Map the core journey from opening the app to completing its main action. Include registration, sign-in, forgotten access, empty states, errors and what happens after completion.
- Who uses the first release?
- What brings them back?
- What is the shortest successful journey?
- Which actions require approval or support?
List the data and systems the app depends on
An app usually needs a backend for accounts, content, permissions, payments, files or synchronization. If the business already has a website, CRM or internal system, decide which one owns each record and whether an API exists. Integration work can be a major part of the project.
Identify personal or sensitive data early. Decide what the app stores on the device, what stays on the server, how access is removed and which actions need a history. These choices affect screens as well as technical architecture.
Decide which phone capabilities are genuinely useful
Notifications, camera access, location, contacts, biometrics and offline storage should solve a clear user problem. Every permission needs an explanation and can create extra testing and privacy work. Ask only when the user reaches the feature that needs it.
Plan behaviour for poor connections, interrupted uploads, denied permissions and older devices. A mobile app is used in less predictable conditions than a desktop system.
Prepare store accounts, testing and ongoing ownership
The business should own its Apple and Google developer accounts. Account verification and store review can take time, so they should not be left until the planned launch day. Prepare the app name, descriptions, privacy information, support contact, screenshots and any required demonstration access.
Choose real testers across relevant phone sizes and operating-system versions. After release, plan for crash monitoring, user support, security updates and compatibility with new iOS and Android versions. An app remains a live product after the first approval.