Building an iOS app is one of the highest-return moves a business can make — iPhone users spend more per app and convert better than almost any other audience. But going from an idea to a live App Store product raises a lot of questions: how to build an iOS app, what it costs, how long it takes, and what you actually need. This guide walks through the full process, step by step.
Is It Hard to Build an iOS App?
Building an iOS app is very achievable with the right plan and team. The hard part is rarely the code itself — it is choosing the right scope, designing a product people want to use, and shipping it to the App Store without surprises. Below we break the process into seven clear steps you can follow whether you build in-house or with a partner like Vitarum.
How to Build an iOS App: 7 Steps
1. Validate the idea and define the scope
Start with the problem, not the features. Define who the app is for, the single core action it must nail, and the metrics for success. Cutting scope to a focused MVP is the biggest lever on cost and time-to-market.
2. Design the UX and UI
Map the user journey, then design screens that follow Apple's Human Interface Guidelines. A clean, native-feeling interface increases App Store approval odds and user retention.
3. Choose your technology
You can build a native iOS app with Swift and SwiftUI, or go cross-platform with Flutter or React Native to cover Android at the same time. We compare the trade-offs in our Flutter vs React Native vs Native guide.
4. Develop the app
Development happens in Xcode, in short iterations with regular demos. Build the core flow first, integrate APIs and back end, then layer on secondary features.
5. Test on real devices
Test on physical iPhones and iPad where relevant, across iOS versions and screen sizes. Cover functionality, performance, security and edge cases before release.
6. Submit to the App Store
You need an Apple Developer account (99 USD/year). Prepare the listing, screenshots and privacy details, then submit for App Review. Most apps are reviewed within 24–48 hours.
7. Launch, measure, iterate
After launch, track analytics, gather reviews and ship updates. The first 90 days of feedback shape your roadmap more than anything you planned upfront.
How Much Does It Cost to Build an iOS App?
The cost to build an iOS app depends mostly on complexity:
- Simple app (a few screens, one core feature): from £8,000–£20,000
- Mid-complexity app (accounts, back end, integrations): £20,000–£60,000
- Complex product (real-time, payments, custom design, AI): £60,000+
Want a quick estimate for your idea? Use our app cost calculator.
How Long Does It Take to Build an iOS App?
A focused MVP typically ships in 2–4 months. Apps with many integrations, custom design or a companion Android version usually take 4–8 months from kickoff to launch.
Native Swift vs Cross-Platform
Native Swift gives the best performance and full access to the latest iOS features — ideal for hardware-heavy or performance-critical apps. Cross-platform frameworks let you launch on iOS and Android from one codebase, which is faster and cheaper when reach matters more than squeezing out maximum performance.
5 Common Mistakes to Avoid
- Building too many features before validating the core idea
- Ignoring Apple's Human Interface Guidelines (a frequent rejection cause)
- Skipping real-device testing and relying only on the simulator
- Leaving App Store assets and privacy details to the last minute
- Treating launch as the finish line instead of the start of iteration
Want to build your iOS app?
Vitarum is a full-cycle development company. We take iOS apps from idea to the App Store — design, development, testing and launch. See our mobile app development services or get a free estimate.
Frequently Asked Questions
How much does it cost to build an iOS app?
A simple iOS app typically starts around £8,000–£20,000, a mid-complexity app £20,000–£60,000, and a complex product £60,000 and up. The final cost depends on features, integrations and design.
How long does it take to build an iOS app?
An MVP usually takes 2–4 months. More complex apps with many integrations and custom design take 4–8 months.
Do I need to know how to code to build an iOS app?
To build a production-grade iOS app you need Swift and Xcode skills, or a development partner. No-code builders only work for very simple apps.
Do I need an Apple Developer account to publish an iOS app?
Yes. An Apple Developer Program membership (99 USD per year) is required to publish an app on the App Store.
Should I build a native Swift app or cross-platform?
Choose native Swift for performance-critical or hardware-heavy apps; choose cross-platform (Flutter or React Native) to launch on iOS and Android faster and at lower cost.