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iOS App Development: A Complete Guide for UK Businesses

Published 1 November 2026 · 7 min read

Building an iPhone app can transform your business — but the process can feel overwhelming if you haven't done it before. This guide breaks down everything you need to know, from initial idea to App Store launch.

Why build an iOS app?

Despite Android having a larger global market share, iOS dominates in the UK — over 50% of UK smartphone users have an iPhone. iOS users also tend to spend more on apps and in-app purchases, making iPhone the platform of choice for many UK businesses.

An iOS app makes sense when you need:

• Push notifications to keep users engaged
• Offline functionality
• Access to device features (camera, GPS, biometrics)
• A faster, smoother experience than a mobile website
• A subscription-based product or service

How much does an iOS app cost in the UK?

App development costs vary widely based on complexity:

• Simple app (MVP / single feature): £3,000–£8,000
• Medium-complexity app: £8,000–£25,000
• Complex app (marketplace, social features, AI): £25,000–£80,000+

On top of development, you'll need an Apple Developer Account (£79/year) and should budget for ongoing maintenance, updates, and server costs.

Native vs cross-platform: which to choose?

Native iOS (Swift / SwiftUI)

Built specifically for iPhone using Apple's own programming language. Best performance, best access to iOS features, best user experience. Choose this if your app is iOS-only or performance is critical.

Cross-platform (React Native / Flutter)

Write once, run on both iOS and Android. Saves 30–40% of development cost if you need both platforms. Slight trade-offs in performance and native feel, but modern frameworks have narrowed the gap significantly.

Our recommendation: If you only need iOS, go native with Swift. If you need both platforms and budget is a concern, React Native or Flutter is the smart choice.

The development process

1. Discovery & planning (1–2 weeks) — define features, user flows, and technical requirements
2. UI/UX design (2–3 weeks) — wireframes, mockups, and interactive prototypes
3. Development (4–12 weeks) — building the app, connecting APIs, implementing features
4. Testing (1–2 weeks) — bug fixing, performance testing, user testing
5. App Store submission (1–2 weeks) — preparing assets, writing the listing, submitting for review
6. Launch & iteration — monitoring performance, collecting feedback, releasing updates

A typical app takes 8–16 weeks from kickoff to App Store launch.

The Apple review process

Every app submitted to the App Store goes through Apple's review team. They check for:

• Crashes and bugs
• Compliance with Apple's Human Interface Guidelines
• Privacy and data handling
• Accurate App Store listing information
• No misleading content or functionality

Reviews typically take 1–3 days. If your app is rejected, Apple tells you why and you can fix and resubmit. Having an experienced developer helps avoid common rejection reasons.

What you need to get started

1. A clear idea — what problem does the app solve? Who is it for?
2. An Apple Developer Account — £79/year, registered to your company
3. A D-U-N-S Number — free from Dun & Bradstreet, required for company accounts
4. A budget and timeline — even rough numbers help your developer plan effectively

Our experience

At 1912 Labs, we've built and launched iOS apps ourselves — including Keybored, an AI-powered keyboard app available on the App Store. We understand the entire process from development through Apple's review, and we can guide you through every step.