We design and build custom iPhone and iPad apps for London and UK businesses, from first MVP to App Store launch and beyond. Native Swift and SwiftUI apps that feel at home on Apple devices, built around your users and connected to the systems you already use.
- Swift and SwiftUI
- iPhone, iPad and beyond
- App Store submission handled
- You own the code
A custom iOS app development agency built around your users
iPhone users expect apps that are fast, intuitive and consistent with the rest of their device. Meeting that expectation takes more than code: it takes understanding Apple's design conventions, App Store rules and the details that make an app feel native.
Our team designs and builds custom iOS apps for customers and staff: booking and ordering apps, customer portals, field service tools, health and fitness apps and more. We start with your goals, recommend whether native iOS or a cross-platform app is the better fit, and deliver in two-week sprints with builds you can test on your own iPhone through TestFlight.
Need Android too? See our mobile app development services.
Our iOS app development services
Everything from first idea to a live, well-maintained app.
Custom iPhone apps
Native apps for customers or staff, designed around your workflows and users.
iOS UI and UX design
Designs that follow Apple's Human Interface Guidelines, with prototypes you can test.
MVP development
A focused first version to test your idea with real users. See MVP development.
Enterprise iOS apps
Secure apps for teams, with single sign-on, device management and system integrations.
APIs and integrations
Payments, Apple Pay, CRMs, booking systems and your own back end.
iPad, Watch and Vision Pro
Extending your app to Apple Watch, iPad, Mac and Apple Vision Pro where it adds value.
App updates and migration
Updating older apps for new iOS versions and moving from Objective-C or UIKit to Swift and SwiftUI. Read our UIKit to SwiftUI guide.
Testing and QA
Testing across iPhone and iPad models and iOS versions, plus accessibility checks.
Maintenance and support
Bug fixes, iOS updates, monitoring and new features after launch.
Native iOS or cross-platform?
We'll recommend honestly based on your users, features and budget.
| Native iOS (Swift, SwiftUI) | Cross-platform (Flutter, React Native) | |
|---|---|---|
| Platforms | iPhone, iPad and other Apple devices | iOS and Android from one codebase |
| Performance and polish | Best possible, fully native feel | Close to native for most business apps |
| Newest Apple features | Available straight away | Sometimes via plugins or later |
| Cost for iOS and Android | Higher, as two apps are needed | Usually lower |
| Best for | iPhone-first products, complex device features, Apple ecosystem apps | Reaching both platforms on a tighter budget |
Need both platforms? See cross-platform app development, Flutter or React Native.
App Store-ready from day one
Apps are reviewed by Apple before they go live, and rejections can delay launches. We build to Apple's App Store Review Guidelines and Human Interface Guidelines from the start, and handle the submission process with you.
Your app is published under your own Apple Developer account, so you keep full control. The Apple Developer Program currently costs £79 a year.
- App Store listing, screenshots and privacy details
- TestFlight beta testing with your team
- In-app purchase and subscription set-up where needed
- Privacy permissions and tracking rules handled correctly
- Accessibility with VoiceOver and Dynamic Type
- Support through review and future updates
iOS app development cost
Indicative ranges for iOS apps with an admin panel, excluding VAT and Apple fees.
| Project | Typically includes | Typical cost | Timeline |
|---|---|---|---|
| MVP or simple app | Core features, login, notifications, admin panel | £10,000 – £35,000 | 2 – 4 months |
| Medium-complexity app | Payments, integrations, custom design, analytics | £35,000 – £80,000 | 4 – 6 months |
| Complex app | Real-time features, AI, multiple roles, high security | £80,000+ | 6 months or more |
For more detail, read our iOS app development cost in London guide, or estimate your budget with the app cost calculator.
Have an iPhone app idea?
Tell us what you want to build. We'll recommend native or cross-platform and send an itemised GBP quote.
Our iOS app development process
Discovery
Goals, users, features and integrations agreed.
Design
Wireframes and iOS-native designs, tested as prototypes.
Development
Two-week sprints in Swift and SwiftUI.
TestFlight
Test builds on your own devices throughout.
QA
Devices, iOS versions, accessibility and security.
App Store launch
Listing, submission and review support.
Support
Updates, monitoring and new features.
iOS technologies we use
| Area | Technologies |
|---|---|
| Languages and UI | Swift, SwiftUI, UIKit, Objective-C for existing apps |
| Apple frameworks | Core Data, SwiftData, CloudKit, MapKit, HealthKit, ARKit, StoreKit, Push Notifications |
| Tools | Xcode, TestFlight, App Store Connect, XCTest |
| Back end | Node.js, Python, Firebase, REST and GraphQL APIs |
| Cloud | AWS, Microsoft Azure, Google Cloud |
| Payments | Apple Pay, Stripe, in-app purchases and subscriptions |
Industries we build iOS apps for
Retail and ecommerce
Shopping apps, loyalty and Apple Pay checkout.
Healthcare and wellness
Booking, patient and fitness apps. See healthcare app development.
Finance
Secure customer apps with strong authentication. See finance app development.
Education
Learning and membership apps. See education app development.
Hospitality
Ordering, booking and loyalty apps. See restaurant apps.
Media and entertainment
Streaming, content and community apps.
Apps from our portfolio
A selection of mobile and web products our team has designed and built.
Why choose Fulminous Software for iOS development
Native iOS skills
Swift and SwiftUI developers who follow Apple's conventions.
Honest recommendations
Native or cross-platform, based on what suits your users and budget.
Test as we build
TestFlight builds every sprint on your own devices.
London-headquartered
UK-hours project management and the option to meet in person.
Itemised GBP quotes
Clear proposals with VAT shown separately.
You own your app
Code, designs and App Store account in your name.
Ways to work with us
Fixed price
For well-defined apps and MVPs with agreed milestones.
Time and materials
For evolving products where priorities change.
iOS app development FAQs
How much does iOS app development cost in London?
As a guide, an iOS app MVP typically costs £10,000 to £35,000, a medium-complexity app with payments and integrations £35,000 to £80,000, and a complex app £80,000 or more. Costs depend on features, design, integrations and whether you also need Android or web versions. Prices exclude VAT.
How long does it take to build an iOS app?
A simple app or MVP usually takes 2 to 4 months, a medium-complexity app 4 to 6 months, and complex apps 6 months or more, including design, development, testing and App Store review.
Do you build native iOS apps or cross-platform apps?
Both. We build native iOS apps in Swift and SwiftUI when you need the best performance and the newest Apple features, and cross-platform apps with Flutter or React Native when you need iOS and Android from one codebase.
Can you help with App Store submission?
Yes. We prepare your App Store listing, privacy details and test builds through TestFlight, submit the app for Apple's review and handle any feedback. Apple decides whether to approve an app, so we design and build to its App Store Review Guidelines from the start.
Can you take over or update an existing iOS app?
Yes. We can review an existing app, fix bugs, update it for new iOS versions, migrate older UIKit or Objective-C code to Swift and SwiftUI where it makes sense, and add new features.
Which Apple devices do you build for?
We build for iPhone and iPad, and can extend apps to Apple Watch, Mac, Apple TV and Apple Vision Pro where it adds value for your users.
How do you keep iOS apps secure?
We use secure authentication, encrypted network traffic, Apple's Keychain for sensitive data, careful permission requests and regular dependency updates, and design for UK GDPR. Apps handling sensitive data can also have independent security testing.
Will I own the app?
Yes. You own the source code, designs and App Store account, and the app is published under your Apple Developer account.
Ready to build your iOS app?
Tell us about your idea, users and timeline. We'll recommend the right approach and send an itemised GBP quote.
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