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Book a free 30-minute call with a specialist consultant — leave with a native-Swift-vs-Flutter recommendation, a realistic estimate and a clear path to the App Store.
UP2DATE is an iOS app development company specialized in native Swift — for the deepest platform integration and performance. When a single codebase across iOS and Android fits better, we also build with Flutter. We recommend the right tool for your product, not ours.

Swift and SwiftUI for the deepest platform integration — HIG-compliant navigation, platform-native gestures, pixel-accurate layouts and the performance only native gives. When a single codebase across iOS and Android fits better, we deliver the same fidelity with Flutter.
HealthKit integrations, ARKit scenes, home-screen widgets, watchOS complications and Siri shortcuts — when the feature genuinely needs Swift, we write a clean platform channel module and wire it into the Flutter layer without leaking complexity.
We own the full submission: provisioning profiles, metadata, screenshots for every device class, privacy manifests and re-submission if review bounces. We have never received a permanent rejection on a client app.
Apple Human Interface Guidelines are not a checklist we tick at the end — they shape component choices from day one. SF Symbols, dynamic type, safe-area awareness and dark-mode fidelity are built in, not retrofitted.
Automated CI builds signed and pushed to TestFlight on every merge. Internal testers get a fresh build within minutes; external beta groups are managed with staged invitations so feedback stays structured and actionable.
Instruments sessions before each release — frame drops, memory pressure and excessive wake-lock usage caught before the App Store reviewer sees them. We optimise for the low-end iPhone in your target market, not the latest Pro.
Native Swift is our specialty and default for iOS. Flutter is the right call when a single codebase across both platforms matters more. Here is how we actually think through the choice.
One codebase, guaranteed feature parity, half the maintenance burden. The correct choice almost every time.
Scene reconstruction, Reality Composer Pro assets and visionOS spatial APIs have no clean Flutter equivalent. We build native.
Rewriting a working Swift app in Flutter to add features creates risk with no gain. We extend what you have.
A single Flutter codebase reaching App Store and Play Store costs 40–60% less than two native builds. Budget drives this one.
Swift and SwiftUI are our native iOS layer. Flutter and Dart when a single codebase across iOS and Android fits. Xcode and TestFlight in the CI pipeline, App Store Connect for delivery.
We do not use Xamarin, Ionic or Cordova. If a project is better served by cross-platform Flutter than by native Swift, we say so before you commit — not six months later.
Native Swift is our specialty — the strongest choice for deep platform integration and performance: complex ARKit or RealityKit scenes, CarPlay, watchOS complications with custom rendering, or Objective-C interop with legacy C++ libraries. Flutter is the right call when you also need Android, or when a single codebase, lower cost and faster iteration matter more — it renders at 60/120 fps, respects iOS safe areas, uses SF Symbols and passes App Store review routinely, so users cannot distinguish it from native. We recommend based on your product, not our preference.
We build against Apple's review guidelines from the first sprint — privacy manifests, data-collection disclosures, in-app purchase flows and age ratings are not afterthoughts. When a rejection does land (it happens, even to experienced teams), we diagnose the exact guideline cited, fix the issue, and re-submit within 48 hours. Re-submission is included at no extra cost. We have never had a permanent rejection on a client app.
For iOS-only, native Swift is often the strongest choice — the deepest platform integration and no cross-platform layer to maintain — and it is our specialty. Flutter still makes sense if you may expand to Android later, want a faster build loop, or have a tighter budget. We recommend native when your product leans on OS-level features or an existing Swift codebase, and Flutter when reach and speed matter more. The right tool for your project wins, not the one we prefer.
Yes. We start with a codebase audit — architecture health, dependency currency, test coverage and any known App Store compliance gaps. From there we can take over maintenance, add features in-place, or (where it makes sense) plan a gradual migration to Flutter. We give you an honest assessment of what the codebase needs before committing to a scope.
A focused MVP with core features, authentication, two to four main screens and App Store submission typically takes eight to twelve weeks. More complex apps with a custom backend, third-party integrations or regulated data handling (HIPAA, medical device classification) run four to six months. App Store review adds five to seven business days on top of development. We run weekly TestFlight builds from sprint one so you can see real progress throughout, not just at the finish line.
FintechNative iOS & Android apps for international money transfers — bank-grade encryption, biometric auth and real-time tracking. Digital adoption rose 85% with zero security incidents.
Book a free 30-minute call with a specialist consultant — leave with a native-Swift-vs-Flutter recommendation, a realistic estimate and a clear path to the App Store.
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