iOS App Development Company 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).

Pricing starts at 12,000 EUR/month per dedicated team (one senior iOS engineer + part-time tech lead, QA, and PM allocation). Standard product team is two senior iOS engineers + tech lead + QA + designer + PM at 28,000–34,000 EUR/month. Project sprints (e.g. App Clip MVP, ATT migration, SwiftUI rewrite of a tab) start at 25,000 EUR for a 6-week fixed-scope engagement. CET workday with 9 AM–1 PM ET overlap. Three-month minimum on dedicated teams, then month-to-month with 30 days notice.