Building a mobile app is not one big leap — it is a series of well-defined stages, each with its own deliverables. Knowing them helps you plan budgets and timelines, ask the right questions and avoid surprises at launch. Here is the process we follow at Zinetics, based on apps we have shipped to the App Store and Google Play.
Stage 1: Discovery (1–3 weeks)
Discovery turns an idea into a plan. Typical activities:
- Define the target users and the core problem the app solves.
- List and prioritise features — what goes in version one (see our MVP guide).
- Map user journeys: sign-up, the core workflow, payments, notifications.
- Decide the platform approach: native iOS and Android, or cross-platform.
- Identify integrations — payment providers, maps, CRMs, health or fitness data, AI services.
Deliverables: feature list, user flows, technical approach and an estimate.
Stage 2: UX and UI design (2–4 weeks)
- Wireframes for every screen and state, including empty states and errors.
- A clickable prototype to test with real users before any code is written.
- Visual design following Apple's Human Interface Guidelines and Google's Material Design, so the app feels at home on each platform.
- Accessibility: readable text sizes, contrast, screen-reader labels and touch targets.
Deliverables: approved designs and a prototype developers build from.
Stage 3: Development (6–16 weeks for most first versions)
Choosing the approach
| Approach | Pros | Best for |
|---|---|---|
| Cross-platform (Flutter, React Native) | One codebase for iOS and Android, faster and more cost-effective | Most business and consumer apps |
| Native (Swift, Kotlin) | Deepest platform access and performance | Heavy graphics, advanced hardware features |
| Progressive web app | No store needed, one web codebase | Simple tools and content apps |
We compare the two leading frameworks in React Native vs Flutter.
What gets built
- The app — screens, navigation, offline behaviour, notifications.
- The back end — APIs, database, authentication, admin panel and integrations.
- Analytics and crash reporting — so you can see how people use the app and fix problems fast.
Development runs in two-week sprints with a working build you can install and test after each one.
Stage 4: Testing and quality assurance (ongoing, plus 1–2 weeks before launch)
- Functional testing of every feature and edge case.
- Testing on a range of real devices and OS versions, not just simulators.
- Performance, battery and network testing (slow and offline connections).
- Security review: data storage, API access and authentication.
- Beta testing with real users through TestFlight (iOS) and Google Play testing tracks.
Stage 5: App Store and Google Play submission (1–2 weeks)
- Prepare store listings: name, description, keywords, screenshots and preview video.
- Complete privacy details — Apple's privacy "nutrition labels" and Google Play's Data safety form.
- Provide demo accounts for reviewers if the app requires sign-in.
- Submit for review. Apple and Google review new apps before publishing; most reviews are quick, but rejections for missing information or guideline issues are common — build in time to respond.
Stage 6: Launch and continuous improvement
Launch is the beginning. After release:
- Monitor crashes, reviews and analytics daily in the first weeks.
- Release fixes and improvements regularly.
- Keep up with new iOS and Android versions each year.
- Add features based on real usage data, not guesses.
- Consider AI features — smart search, assistants, personalised recommendations — once the core app is stable (see how to add AI to an existing app).
How long does it take to build an app?
For a typical first version with a back end, expect roughly three to six months from discovery to store release. Simple apps can be faster; complex platforms with many integrations take longer. Clear scope and quick feedback on designs and builds are the biggest factors you control.
What affects the cost?
- Number of screens and features.
- Cross-platform or separate native apps.
- Back-end complexity, integrations and admin tools.
- Design depth (custom illustrations, animation).
- Compliance requirements, such as health or financial data.
The most reliable way to get an accurate estimate is a short discovery phase that defines scope before development starts.
Zinetics has built and published apps across health, fitness, education, real estate and more. See our mobile app development services, browse published apps in our portfolio, or tell us about your app.