iOS App Development Services for US & EU Brands

New iOS projects start on Swift 6 with strict concurrency enabled and target iOS 17 as the deployment minimum, with iOS 18 as the build SDK. That covers roughly 92 percent of active US/EU iPhones at time of writing. For B2B apps that must run on legacy fleet devices we drop the floor to iOS 16 and isolate Swift 6 concurrency with @preconcurrency imports. SwiftUI is the default UI layer with UIKit interop where SwiftUI still lacks coverage (camera capture pipelines, advanced PDFKit, custom keyboard input).

We treat App Store Review Guidelines 2.x, 3.x, 4.x and 5.x as a hard pre-flight checklist before every submission. The most common rejection patterns we eliminate: Guideline 4.0 (incomplete metadata, missing demo account), Guideline 2.1 (crash on TestFlight build with reviewer locale), Guideline 3.1.1 (digital goods routed through Stripe instead of IAP), Guideline 5.1.1 (purpose strings missing in Info.plist for camera, photos, contacts, motion), and Guideline 5.1.2 (account deletion not in-app, required since June 2022). We also pre-fill the App Privacy nutrition labels accurately and keep them in sync with the actual SDK behaviour.

App Tracking Transparency (ATT) is mandatory since iOS 14.5 for any cross-app/site tracking via IDFA. We gate IDFA access behind ATTrackingManager.requestTrackingAuthorization, show the pre-prompt only when there is genuine product value, and design the app to function fully when the user declines (US opt-in rates are 25–38 percent). For EU Digital Markets Act compliance we support alternative app marketplaces, third-party browser engines via BrowserEngineKit on iOS 17.4+ in the EU, and the contractor-entitled NFC/contactless payment APIs where the business case requires it.

Default is SwiftUI-first with the Observation framework (iOS 17+) replacing ObservableObject, and UIViewRepresentable bridges where UIKit is still ahead — high-FPS table cells with custom layout, AVFoundation camera UI, PencilKit, and MapKit overlays at scale. We use Swift Concurrency (async/await, actors, structured tasks) instead of Combine for new code; existing Combine pipelines are kept and bridged. Navigation uses NavigationStack with type-safe NavigationPath. The Composable Architecture (TCA) is on offer for teams that want it, but we default to vanilla SwiftUI + Observation for new projects.

GDPR-aligned by design: lawful basis documented per data category, in-app consent flows separate from ATT, granular data export and account deletion (also an App Store requirement since 2022), and DPAs with every third-party SDK. For EU customers we host backend infra in eu-central-1 or eu-west-3, encrypt at rest with AWS KMS or GCP CMEK, and keep PII out of crash reports (Sentry/Firebase Crashlytics PII scrubbing enabled). For CCPA we ship the Do Not Sell/Share signal handling and a CCPA-specific privacy screen for California users detected via region (not IP geolocation, which is unreliable on iOS).

iOS projects are fixed-scope and tiered by product complexity, all-in and quoted in USD. An MVP runs from $3,500 (4–8 weeks) for the first working app with the core flow and an App Store release; a production app from $5,800 with several features, backend integration, offline persistence and analytics; a full product from $9,200 with multiple modules, roles, external integrations, CI/CD and device QA; a complex app from $11,500 with payments, offline-first sync, native SDKs, scale and A/B. The exact number depends on how many Apple surfaces you ship, integration and StoreKit complexity, and compliance scope. You see the line-item budget at the end of discovery and sign off before any code is written. There are no hidden fees and no tool surcharges. Apple Developer Program and third-party API fees are billed on your own accounts.