Need an iOS app development company?
Book a free 30-minute call with a senior iOS engineer — leave with a Flutter-vs-Swift recommendation, a realistic estimate and a clear path to the App Store.
UP2DATE is an iOS app development company that defaults to Flutter — one codebase, native performance, faster iteration. Where Swift is genuinely the right call (HealthKit depth, ARKit scenes, watchOS hooks) we write it. That honesty is the product.

Our Flutter apps pass App Store review with HIG-compliant navigation, platform-native gestures and pixel-accurate layouts. Users cannot tell it is Flutter — and that is the point.
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.
We default to Flutter because it is the right tool for most iOS projects. But not all. 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.
Flutter and Dart are our primary layer. Swift for native modules where platform APIs demand it. SwiftUI for module-level UI when we are building natively. Xcode and TestFlight in the CI pipeline, App Store Connect for delivery.
We do not use Xamarin, Ionic or Cordova. If a project genuinely warrants fully native Swift from the ground up, we say so before you commit — not six months later.
For the vast majority of apps, yes — users cannot distinguish Flutter from native. Flutter renders with its own engine at 60/120 fps, respects iOS safe areas, uses SF Symbols and passes App Store review routinely. The cases where native Swift genuinely wins are narrow: complex ARKit or RealityKit scenes, CarPlay integrations, watchOS complications with custom rendering, or apps that need Objective-C interop with legacy C++ libraries. Outside those scenarios, Flutter delivers the same UX at lower cost and faster iteration.
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.
Often yes. Flutter gives you a faster build loop, a larger component library, and a codebase that can expand to Android later if your market grows. That said, if you have strong reasons to stay Swift-only — existing native codebase, deep OS-level features, a team that already knows Swift — we will recommend native rather than push Flutter on you. 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 senior iOS engineer — leave with a Flutter-vs-Swift recommendation, a realistic estimate and a clear path to the App Store.
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