Swift development company
Native Apple apps written in Swift by engineers who know the platform: SwiftUI interfaces with UIKit where it still wins, Swift 6 data-race safety, offline storage, in-app purchases and release pipelines built around TestFlight and App Review.
- Senior engineers · IST + EST overlap
- NDA on day 1
- 24-hour reply
- Projects shipped
- 50+
- Code ownership
- 100%
- Client rating
- 4.8/5
- First reply
- 24h
Swift apps that feel native on every device
If your product has to feel at home on iPhone, iPad, Mac or Apple Watch, Krapton is a Swift development company that builds it natively rather than through a cross-platform layer. Most new screens are written in SwiftUI with the Observation framework, while UIKit stays in play for complex collection views, text editing and older codebases that cannot be rewritten in one go. Concurrency is where many Swift codebases now struggle: Swift 6 language mode turns data-race warnings into errors, and migrating means marking types Sendable, isolating UI state to the main actor and replacing completion-handler chains with async/await. Our engineers plan that migration module by module. Around the app sits the work buyers often underestimate: Keychain and privacy manifests, StoreKit 2 subscriptions, push notifications, offline sync with SwiftData or Core Data, crash reporting, and a fastlane or Xcode Cloud pipeline that ships TestFlight builds on every merge.
Swift development services
SwiftUI app development
New iPhone and iPad apps built in SwiftUI with @Observable models, NavigationStack routing and accessibility support for Dynamic Type and VoiceOver from the first screen.
UIKit modernization
Gradual moves from UIKit and Objective-C to Swift and SwiftUI using UIHostingController, keeping the app shippable at every step instead of pausing features for a rewrite.
Swift 6 concurrency migration
Enabling strict concurrency checking per module, resolving Sendable and actor-isolation errors, and replacing GCD and callback code with structured concurrency that the compiler can verify.
Payments and subscriptions
StoreKit 2 purchase flows, subscription status handling, server-side verification with the App Store Server API, and Apple Pay checkout for physical goods and services.
Offline data and sync
Local persistence with SwiftData or Core Data, background sync against your API or CloudKit, and conflict rules that decide what happens when two devices edit the same record.
watchOS, macOS and widgets
Companion Apple Watch apps, Mac apps, WidgetKit widgets, Live Activities and App Intents for Siri and Shortcuts, sharing Swift packages with the main iOS codebase.
Why teams choose Krapton for Swift
Senior engineers, fixed scope, and code you own — the things agencies promise and rarely deliver.
Platform conventions respected
Apps follow Apple’s Human Interface Guidelines, support Dark Mode, Dynamic Type and VoiceOver, and use system components where custom UI would only add maintenance and review risk.
Modular Swift packages
Features live in local Swift packages with clear boundaries, which shortens build times, enables SwiftUI previews per module and lets widgets or watch apps reuse code safely.
Tests the compiler cannot replace
Swift Testing and XCTest cover view models and networking, snapshot tests guard key screens, and XCUITest runs critical flows such as sign-in and purchase on every pull request.
Release engineering included
Signing, provisioning, TestFlight groups, phased releases and App Store metadata are automated with fastlane or Xcode Cloud, so shipping does not depend on one person’s Mac.
How a Swift project runs with Krapton
01
Product and platform scoping
We define target devices, minimum iOS version, offline needs and backend contracts, since the deployment target decides which SwiftUI and SwiftData APIs are available.
02
Design to SwiftUI
Figma designs are mapped to reusable SwiftUI components and design tokens, with previews reviewed by designers before screens are wired to data.
03
Build and beta
Features ship to TestFlight continuously, with crash reports from Crashlytics or Sentry and performance traces from Instruments reviewed before each external beta.
04
Launch and iterate
Krapton prepares App Review notes, privacy labels and phased rollout, then monitors MetricKit data and crash-free sessions while planning the next release.
The Swift stack we build with
Swift development: questions answered
When should I hire a Swift development company instead of building cross-platform?
Hire one when the app depends on deep Apple platform features or iOS is where most of your revenue comes from. Native Swift gives first access to new APIs, the best performance for camera, audio, AR and on-device ML, and widgets, watch apps and App Intents without bridges. If you need identical Android and iOS apps on a tight budget, Flutter, React Native or Kotlin Multiplatform may serve you better.
Should a new app use SwiftUI or UIKit?
Start new apps in SwiftUI and drop into UIKit only where it clearly does a better job. SwiftUI now covers most interfaces well, and its previews and declarative state make features faster to iterate. UIKit still earns its place for highly customized collection layouts, advanced text editing and some performance-sensitive lists. The two interoperate through UIHostingController and UIViewRepresentable, so mixing them is normal.
How hard is migrating an existing app to Swift 6 strict concurrency?
It is manageable when done module by module, and painful when switched on everywhere at once. We first enable complete concurrency checking as warnings in Swift 5 mode, fix shared mutable state, add Sendable conformances and main-actor isolation, then flip each module to the Swift 6 language mode. Third-party SDKs that are not yet concurrency-safe are wrapped behind actors or marked with @preconcurrency imports until vendors update.
How do you keep a Swift app fast and stable after launch?
By measuring on real devices and watching field data, not just simulator runs. Instruments profiles launch time, hitches and memory; MetricKit and Xcode Organizer report hangs, energy use and crashes from users; and SwiftUI views are checked for unnecessary redraws caused by broad state dependencies. Each release goes out as a phased rollout so a regression can be paused before it reaches every user.
What drives the cost of a Swift app project?
The number of screens matters less than the platform features and integrations involved. Cost rises with offline sync and conflict handling, in-app purchases and subscription logic, extensions such as widgets or watch apps, accessibility and localization depth, backend work, and the age of any existing Objective-C or UIKit code. The minimum iOS version also matters, because supporting older releases limits which modern APIs can be used.
Ready to build? Tell us what you have in mind.
Send a short brief and a senior engineer will reply within one business day with next steps — no sales fluff.