Mobile app development — from idea to App Store launch

The first question every client asks: should we go native iOS and Android or cross-platform? Short answer: for 80% of projects today, Flutter or React Native are perfectly sufficient. Native (Swift for iOS, Kotlin for Android) makes sense when the app uses advanced hardware features, works with AR/VR, or needs absolute maximum performance as in gaming. For business apps, booking systems, e-commerce and anything working with APIs — Flutter is now the de facto standard because one team writes one codebase that runs on both platforms.

MVP — Minimum Viable Product — is not a compromise but a strategy. The point: launch the smallest possible set of features that solves the core user problem, gather feedback, then iterate. A company from Novi Sad that came to us for a booking app for wellness centres wanted 14 features at the start. We convinced them to begin with 4 key ones: user profile, centre search, appointment booking, email confirmation. Launched in 6 weeks instead of 6 months. After 3 months of user feedback they added 5 more features — the right ones, not what they thought was needed.

Mobile app development in Serbia costs less than in the West, but not trivially. For a Flutter MVP with basic features (login, profile, 2-3 screens with API calls) — a realistic range is €8,000 to €15,000. More complex apps with custom UI, real-time features and backend development start from €20,000. Belgrade agencies are typically 40 to 60% cheaper than German or British ones, with the same level of technical competence for standard projects. Freelancers are cheaper but a risk for long-term projects — there's no team to take over if the person drops out.

The App Store (Apple) is stricter than Google Play. Apple review takes an average of 24 to 48 hours, but rejection is not rare. Most common rejection reasons: missing privacy policy inside the app, app works as a 'web wrapper' without enough native value, missing test credentials for the reviewer, or screenshots don't match the actual app appearance. Google Play is faster (a few hours to 3 days) but has automated security scans that can block a release. Both require a developer account: Apple $99 annually, Google $25 one-time.

The most common mistake isn't technical — it's organisational. Clients start development without clearly defined user flows. The developer asks 'what happens when a user forgets their password' and the answer is 'well... something.' Such moments are expensive. Before a single line of code is written, there must be a wireframe for every screen and a defined flow for every scenario. Second mistake: not testing on real devices. The emulator doesn't catch everything. Feather Studio does mobile app development from the wireframe phase to App Store launch — contact us for an estimate on your project.