iOS App Development Services

Native iOS Apps
Built with Modern
Swift 6 & SwiftUI

CrestCoder builds native iOS apps with Swift 6, SwiftUI, and strict concurrency for businesses across India, Australia, South Africa, and the UK. Compiler-safe code. Apple Intelligence ready. Production-tested apps for iPhone and iPad.

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80+

iOS apps shipped

Years iOS experience

Countries served

Swift in 2026

Strict concurrency,
modern state, Apple AI

Swift 6 made strict concurrency the default. The compiler now catches data races at compile time — eliminating an entire class of crashes. SwiftUI's @Observable macro and SwiftData have standardised state management. This isn't incremental — it's a complete rewrite of production iOS patterns.

Compiler-safe code

Swift 6 strict concurrency uses Sendable conformances and actor isolation to guarantee no data races — caught at compile time, not in production.

@Observable state

@Observable macro replaces ObservableObject — less boilerplate, better performance, granular view re-renders only when needed.

SwiftData persistence

Native Swift persistence replaces Core Data — type-safe, integrates seamlessly with SwiftUI, no more manual fetch requests.

Apple Intelligence ready

iOS 26 ships with on-device AI. Language features, Foundation Models, ML models — privacy-first, no cloud calls needed.

What We Build

iOS development
services we deliver

Custom iOS Apps

Native iPhone and iPad apps with Swift 6 and SwiftUI — consumer apps, SaaS, enterprise tools, marketplaces.

App Design & UI/UX

Human Interface Guidelines compliance, Liquid Glass designs, responsive iPad layouts — Figma assets before code.

Apple Intelligence Integration

On-device AI features, Foundation Models, language processing — privacy-first, no cloud dependencies.

API & Backend Integration

REST, GraphQL, Apple Pay, Sign in with Apple, CloudKit — clean integration patterns with error handling.

Performance & Testing

Unit tests with Swift Testing, profiling with Instruments, crash monitoring — zero crashes before launch.

Maintenance & Support

Monthly retainers covering iOS updates, feature additions, App Store submissions, and performance tuning.

iOS in Production

Apps shipping
on the App Store

Rumie Campus App

Education · iOS

Rumie — Education for 30+ Countries

Challenge

An education non-profit needed a native iOS app serving learners across 30+ countries with offline content, minimal data usage, and multi-language support — built for low-bandwidth environments.

Solution

We built a native iOS app with SwiftUI, offline-first architecture, progressive content delivery, and SQLite persistence — reaching learners with zero internet access.

iOS + AndroidNative + cross-platform

Offline FirstNo connectivity

View Full Case Study →

Foil Republic POS

Retail · POS

Foil Republic — Mobile-First Point of Sale

Challenge

A retail and logistics business needed a native iOS POS app — replacing a legacy desktop system with a modern, connected point-of-sale that syncs directly to inventory and fulfillment operations.

Solution

We built a native iOS app with SwiftUI, real-time inventory sync, offline capability, and direct integration to their backend — making the old system obsolete on day one.

iOS + AndroidNative apps

Real-time SyncInventory + logistics

View Full Case Study →

View All Case Studies

Why CrestCoder

iOS teams
that ship quality

Swift 6 + SwiftUI default

We build on the current stack from day one — strict concurrency, @Observable, SwiftData, no legacy code.

80+ shipped iOS apps

We know App Store submission, platform-specific APIs, and how to ship performance on every iPhone generation.

Two-week sprint demos

Working app every sprint — TestFlight builds for you to test on real devices throughout development.

25-30 person team, senior-led

Small enough that senior engineers stay hands-on, large enough to staff a dedicated iOS team.

How We Work

Our iOS
development process

Discovery & scoping

Map your requirements, target devices (iPhone/iPad), iOS version baseline, and any Apple-specific features needed.

Design & validation

Human Interface Guidelines-compliant Figma designs for all screen sizes — you approve before code begins.

Agile development

Two-week sprints with TestFlight builds — you can test on real devices throughout development.

Testing & profiling

Swift Testing, Instruments profiling, crash monitoring with TestFlight — zero crashes before App Store.

App Store & support

We handle App Store submission, TestFlight management, and offer optional retainers for updates and feature additions.

Questions?

Frequently
asked

Still have questions? Contact us directly.

Which version of Swift and iOS do you use?+

Swift 6.3+ with strict concurrency as default — the compiler enforces data race safety at compile time. iOS 26 (Apple's new unified year-based versioning) with SwiftUI for all new projects. Xcode 26 with AI coding assistance.

Do you build SwiftUI or UIKit?+

SwiftUI exclusively for new projects — 65% of teams have adopted it across the industry. SwiftUI with @Observable macros, SwiftData, and NavigationStack is the production standard in 2026. UIKit is legacy maintenance only.

How do you handle state management in SwiftUI?+

@Observable macro from the Observation framework replaces ObservableObject + @Published — less boilerplate, better performance, granular view re-renders. SwiftData (Apple's Swift-native persistence) replaces Core Data for most projects.

What about data persistence?+

SwiftData for all new projects — native Swift persistence that integrates seamlessly with SwiftUI's environment system. It replaces Core Data with a modern, type-safe API. No more manual fetch requests or KVC.

Does Apple Intelligence work in our app?+

Yes — Apple Intelligence is available on-device for iOS 26+. You can integrate on-device ML models, Foundation Models, and language features directly. Privacy-first AI that runs locally without cloud calls.

How do you price iOS app development?+

Most projects are quoted as fixed price after discovery. A standard iOS app typically starts around $8,000-$18,000. Apps with complex features, payments, or Apple Intelligence integration usually run $20,000-$50,000+, depending on scope.

Ready?

Tell us about
your app idea

We reply within 24 hours with an honest estimate and timeline — no obligation.

Native iOS AppsBuilt with ModernSwift 6 & SwiftUI

Strict concurrency,modern state, Apple AI