# iOS App Development > App369 builds native iOS applications with Swift and SwiftUI for iPhone, iPad, and Apple Watch. Canonical: https://app369.com/service/ios-development/ Build your mobile app for iOS and Android, or for iPhone only. App369 builds native iOS applications with Swift and SwiftUI for iPhone, iPad and Apple Watch, or cross-platform with Flutter when you also need Android. [**Get Started **→](https://app369.com/contact/) ## **Prefer a fixed price?** Fixed scope, fixed price, paid upfront. The work happens in writing; no call needed. - [**App Fix Ticket**from $450One reproducible bug in an existing mobile or web app, diagnosed and fixed.](https://app369.com/fixed-price/flutter-firebase-bug-fix/) - [**AI-Built App Rescue**from $450A Lovable, Bolt or Cursor app checked end to end in 3 days, then its worst problems fixed at a fixed price.](https://app369.com/fixed-price/ai-app-rescue/) - [**Firebase Security Rules Audit + Fix PR**$950Tests whether one user can read or edit another customer’s data, and fixes what it finds.](https://app369.com/fixed-price/firebase-security-rules-audit/) What Simon builds ## **iOS Development Services** 01 ### **Native Swift Development** High-performance iOS applications built with Swift 5 and modern Apple frameworks. Swift is Apple's official language that delivers C-level performance with memory safety. Simon builds apps that fully leverage Apple's hardware capabilities including Face ID, LiDAR, and the Neural Engine. 02 ### **SwiftUI Interfaces** Declarative UI development with SwiftUI for faster iteration and pixel-perfect interfaces. SwiftUI provides live previews in Xcode, adaptive layouts that work across iPhone, iPad, and Apple Watch, and built-in accessibility support. 03 ### **App Store Optimization** App369's ASO strategies maximize your app's visibility through keyword optimization, compelling screenshots, A/B tested descriptions, and review management to drive organic downloads. 04 ### **Apple Watch Apps** Companion and standalone watchOS applications built with SwiftUI and WatchKit. Simon uses health sensors, complications, and notifications to extend your app experience to the wrist, reaching the 100+ million Apple Watch users worldwide. 05 ### **iPad & Universal Apps** Optimized iPad experiences that take advantage of larger screens with multi-column layouts, drag and drop, Apple Pencil support, and Stage Manager compatibility. Universal apps that adapt automatically across all Apple device sizes. 06 ### **App Clips** Lightweight App Clips under 15MB that let users experience your app instantly without downloading. Triggered via NFC tags, QR codes, or Safari, App Clips drive conversions by lowering the barrier to engagement with your full app. How it works ## **The process** 2. 01 ### **Discovery & Planning** Simon analyzes your business requirements, target audience, and iOS-specific opportunities like Apple Watch, iPad, and App Clips to create a comprehensive development plan with wireframes and architecture decisions. 3. 02 ### **UI/UX Design** Simon designs interfaces following Apple's Human Interface Guidelines in Figma, leveraging iOS-native patterns like tab bars, navigation controllers, and SF Symbols for an intuitive experience. 4. 03 ### **Swift Development** Simon builds your app using Swift, SwiftUI, and UIKit with clean MVVM architecture. Simon integrates Apple frameworks like Core Data, CloudKit, and HealthKit as needed. 5. 04 ### **Testing & QA** Rigorous testing using XCTest for unit and UI tests, TestFlight for beta distribution, and manual QA across iPhone and iPad device sizes to ensure flawless performance and accessibility. 6. 05 ### **App Store Submission** Simon prepares all App Store assets, writes ASO-optimized descriptions, configures App Store Connect metadata, and manages the Apple review process to ensure successful first-submission approval. 7. 06 ### **Maintenance & Updates** Ongoing support including iOS version compatibility updates, security patches, performance optimization, App Store Connect analytics review, and feature enhancements. Technologies - Swift - SwiftUI - Xcode - Core Data - CloudKit - TestFlight Error fixes ## App Store rejections Simon fixes Each page explains the rejection from Apple’s own guidelines, with what to change before you resubmit. - [App Store Guideline 1.3 Kids](https://app369.com/fix/app-store-guideline-1-3-kids-category/) - [App Store Guideline 5.1.1(ix)](https://app369.com/fix/app-store-guideline-5-1-1-ix-regulated-services/) - [App Store Guideline 5.1.1(v)](https://app369.com/fix/app-store-guideline-5-1-1-v-account-deletion/) - [App Store Guideline 2.3.3](https://app369.com/fix/app-store-guideline-2-3-3-screenshots/) - [App Store Guideline 2.2](https://app369.com/fix/app-store-guideline-2-2-beta-testing/) - [App Store Guideline 2.3.7](https://app369.com/fix/app-store-guideline-2-3-7-keywords-and-name/) - [App Store Guideline 2.3.10](https://app369.com/fix/app-store-guideline-2-3-10-other-platforms/) - [App Store Guideline 5.1.1(i)](https://app369.com/fix/app-store-guideline-5-1-1-i-privacy-policy/) - [App Store Guideline 2.3.1](https://app369.com/fix/app-store-guideline-2-3-1-notes-for-review/) - [App Store Guideline 2.3.12](https://app369.com/fix/app-store-guideline-2-3-12-whats-new/) - [App Store Guideline 2.5.1](https://app369.com/fix/app-store-guideline-2-5-1-software-requirements/) - [App Store Guideline 5.1.2](https://app369.com/fix/app-store-guideline-5-1-2-data-use-and-sharing/) - [ITMS-90062 version must be higher](https://app369.com/fix/itms-90062-version-must-be-higher/) - [App Store Guideline 4.0](https://app369.com/fix/app-store-guideline-4-0-design/) - [App Store Guideline 1.5](https://app369.com/fix/app-store-guideline-1-5-developer-information/) - [App Store Guideline 2.5.4](https://app369.com/fix/app-store-guideline-2-5-4-background-modes/) - [ITMS-91061 missing privacy manifest](https://app369.com/fix/itms-91061-missing-privacy-manifest/) - [App Store Guideline 1.2](https://app369.com/fix/app-store-guideline-1-2-user-generated-content/) - [App Store Guideline 2.5.2](https://app369.com/fix/app-store-guideline-2-5-2-executable-code/) - [App Store Guideline 4.5.4](https://app369.com/fix/app-store-guideline-4-5-4-push-notifications/) - [App Store Guideline 5.2.1](https://app369.com/fix/app-store-guideline-5-2-1-intellectual-property/) - [App Store Guideline 4.1](https://app369.com/fix/app-store-guideline-4-1-copycats/) - [App Store Guideline 4.2.3](https://app369.com/fix/app-store-guideline-4-2-3-standalone-app/) - [App Store Guideline 5.1.5](https://app369.com/fix/app-store-guideline-5-1-5-location-services/) - [App Store Guideline 2.3.8](https://app369.com/fix/app-store-guideline-2-3-8-metadata-all-audiences/) - [App Store Guideline 1.4.1](https://app369.com/fix/app-store-guideline-1-4-1-medical-apps/) - [App Store Guideline 2.5.14](https://app369.com/fix/app-store-guideline-2-5-14-recording-consent/) - [App Store Guideline 3.2.2](https://app369.com/fix/app-store-guideline-3-2-2-unacceptable/) - [ITMS-90725 SDK version issue](https://app369.com/fix/itms-90725-sdk-version-ios-26/) - [ITMS-91053 Missing API declaration](https://app369.com/fix/itms-91053-missing-api-declaration/) - [ITMS-90683 Missing purpose string](https://app369.com/fix/itms-90683-missing-purpose-string/) - [App Store Guideline 2.3](https://app369.com/fix/app-store-guideline-2-3-accurate-metadata/) - [App Store Guideline 4.2](https://app369.com/fix/app-store-guideline-4-2-minimum-functionality/) - [App Store Guideline 3.1.1](https://app369.com/fix/app-store-guideline-3-1-1-in-app-purchase/) - [App Store Guideline 3.1.2](https://app369.com/fix/app-store-guideline-3-1-2-subscriptions/) - [App Store Guideline 4.8](https://app369.com/fix/app-store-guideline-4-8-login-services/) - [App Store Guideline 2.1](https://app369.com/fix/app-store-guideline-2-1-app-completeness/) - [App Store Guideline 4.3](https://app369.com/fix/app-store-guideline-4-3-spam/) - [App Store Guideline 5.1.1](https://app369.com/fix/app-store-guideline-5-1-1-data-collection/) Questions ## **Frequently asked questions** ### **How much does it cost to develop an iOS app?** Cost depends on scope, platforms and integrations. App369's rates are published on the fee structure page, and the free app cost calculator gives a range for an iOS app with every assumption listed. Simon sends a fixed quote after reviewing your brief. ### **How long does it take to develop an iOS app?** Simple apps take 2-3 months, medium-complexity apps with CloudKit integration and push notifications require 3-6 months, and complex enterprise applications with custom frameworks and advanced features can take 6-12 months. Apple's annual iOS updates also require compatibility testing, which App369 includes in the development timeline. ### **Should I choose Swift or Flutter for my iOS app?** Choose Swift if your app is iOS-only and requires advanced Apple-specific features like ARKit, HealthKit, or CarPlay. App369 specializes in both approaches and can recommend the best fit during a consultation ($100 per 15 minutes, paid upfront). ### **What is the App Store submission process?** App369 handles this entire process, ensuring compliance with Apple's Human Interface Guidelines and App Store Review Guidelines. ### **How much does iOS app maintenance cost?** App369 provides maintenance packages that include CI/CD pipeline management, automated testing, and Firebase Crashlytics monitoring. ### **What are Apple developer account requirements?** Organizations require a D-U-N-S Number from Dun & Bradstreet. ## **Data and research** - [**Mobile App Market Data 2026**](https://app369.com/statistics/mobile-app-market-data-2026/) App Store billings, iOS and Android share, smartphone ownership and app retention studies, each sourced. - [**Flutter Adoption Statistics 2026**](https://app369.com/statistics/flutter-adoption-statistics-2026/) Survey usage against React Native, Dart usage, GitHub stars and supported platforms. Start here ## **Reach iPhone and iPad Users** iOS users generate the highest in-app revenue of any mobile platform. Whether you need a native Swift app or a [cross-platform Flutter solution](https://app369.com/service/flutter-development/), get a detailed estimate by email, usually within one business day, or book a consultation ($100 per 15 minutes, paid upfront). [**Get in touch **→](https://app369.com/contact/) [**View pricing**](https://app369.com/fee-structure/) Fiverr reviews / 95 on app work ## **What buyers said about this kind of work** [**Read 126 of the 127 reviews **](https://app369.com/reviews/) - - - ### **Read the whole story** - [Sixteen five-star reviews from one buyer: mobile apps, app design and a Shopify store](https://app369.com/case-studies/fiverr/mobile-apps-and-a-shopify-store-for-one-buyer/) (Mark, United States) - [A large custom app build, delivered on the back end and the front end](https://app369.com/case-studies/fiverr/large-custom-app-build/) (A buyer in the United States)