How Much Does It Cost to Build a Mobile App?

Why platform multiplication is the real cost driver

When founders ask what a mobile app costs, the honest answer starts with a question back: one platform or two, and built how? Native iOS is written in Swift; native Android is written in Kotlin. Choosing native-for-both means two codebases, often two developers with different skill sets, two sets of UI work, two QA passes, and two ongoing maintenance streams for every OS release. That is the multiplier that turns a $20,000 idea into a $50,000 one. A cross-platform framework collapses the multiplier: Flutter compiles a single Dart codebase to iOS, Android, and Web, so a feature is written once, themed once, and tested mostly once. You do not eliminate platform-specific work entirely — store submission, push setup, and a few native plugins still differ — but the bulk of the app stops being duplicated. This is why the same feature list can carry wildly different price tags depending only on the build strategy.

• Native both: Swift app + Kotlin app = ~2x the build, QA, and maintenance
• Cross-platform: one Dart codebase to iOS, Android, and Web — write features once
• Residual native work: store submission, some plugins, platform push config
• The feature list is the same; the platform strategy moves the price most

The realistic 2026 cost breakdown

Treat these as estimates, not quotes — scope, region, and platform strategy swing them hard. DIY: an experienced developer shipping a cross-platform MVP is roughly 200-400 hours; the same scope as two native apps is closer to 350-650 because so much is rebuilt for the second platform. Freelancer: $15,000-$50,000, with the upper half almost always reflecting a two-native-codebase scope or heavy custom design. Agency: $60,000-$200,000+, because agencies price discovery, design, two platforms (if native), QA matrices, and margin. The line item that separates a cheap quote from an expensive one is rarely a flashy feature — it is whether the quote secretly assumes two codebases. None of these figures include the runtime stack: Apple Developer ($99/yr), Google Play ($25 one-time), backend hosting, and any AI or messaging usage. Ask any vendor to state their platform strategy explicitly; it is the assumption that moves the number most.

• DIY cross-platform: ~200-400 hrs; two native apps: ~350-650 hrs (est.)
• Freelancer: $15,000-$50,000 (est.), upper half often = two codebases
• Agency: $60,000-$200,000+ (est.), design + multi-platform QA + margin
• Excluded everywhere: store fees, backend hosting, AI/usage costs

The shortcut: a $69 boilerplate on the cross-platform path

If you take the cross-platform route, The Flutter Kit removes the foundation that every mobile app rebuilds regardless of idea. It is a $69 one-time purchase (was $149) with unlimited projects, lifetime updates, and full source ownership: Firebase Auth (email, Google, Apple, anonymous), RevenueCat paywalls across StoreKit 2 and Play Billing, an OpenAI integration routed through a secure Flask proxy so keys never ship in the bundle, FCM push, GA4 analytics with consent, Material 3 theming from one design-token file, and onboarding, settings, and profile screens. The architecture — BLoC with get_it dependency injection, a repository pattern, and go_router navigation — is already settled, so you inherit a clean app instead of designing one. One Dart codebase compiles to iOS, Android, and Web, which is exactly the part that makes cross-platform cheaper than native-for-both. Your hours then go to the features that make your app yours, not the plumbing.

• Auth, RevenueCat payments, FCM push, GA4 — pre-wired, not rebuilt
• OpenAI via secure Flask proxy (keys stay server-side), feature-flagged
• Settled BLoC + get_it + go_router architecture and Material 3 tokens
• One Dart codebase ships iOS, Android, and Web — the cross-platform saving, realized

When native (two codebases) is actually the better choice

Cross-platform is not always right, and pretending otherwise would be dishonest. If your app's entire reason to exist is a deep, single-platform capability — a complex Apple Watch companion, intensive ARKit work, the newest iOS widget or Live Activity APIs the day they ship, or extreme low-level performance tuning — native Swift (or Kotlin) gives you tighter, earlier access than any cross-platform layer. If you are committed to one platform only and will never ship the other, the two-codebase multiplier disappears and native's advantages stand uncontested. And teams that already have separate, strong Swift and Kotlin staff may move faster on their existing stacks than by retraining onto Dart. The Flutter Kit's value is concentrated exactly where most apps live: shipping a polished app to both stores without paying to build it twice. If that is not your situation, the maker also sells The Swift Kit for the native-iOS path.

• Deep single-platform features (Watch, ARKit, day-one widget/Live Activity APIs)
• One-platform-only products where the 2x multiplier never applies
• Teams with established, separate Swift and Kotlin expertise
• Most apps want both stores without doubling the build — that is the cross-platform case

Build it yourself vs The Flutter Kit

Frequently Asked Questions