Want to build a mobile app for iOS and Android without paying twice? Cross-platform is the answer. But which framework: React Native or Flutter? Let's analyse all the angles.
What Is Cross-Platform Development?
Traditionally, an iOS app requires Swift/Objective-C and an Android app requires Kotlin/Java. Two separate teams, twice the budget.
Cross-platform lets you write one codebase that runs on both platforms. Savings: 40–60% of costs while preserving 90%+ of native quality.
Two dominant frameworks: React Native (Meta) and Flutter (Google).
React Native
Created by Facebook (Meta) in 2015. Uses JavaScript and React — web developers can get started quickly.
How Does It Work?
React Native compiles JavaScript to native platform components. A bridge between JS and native APIs. In the new architecture (JSI/Fabric), the bridge is significantly faster.
React Native Advantages
Familiar ecosystem — uses JavaScript/TypeScript and React. If you have a web team, onboarding is quick.
Massive community — millions of developers, thousands of npm libraries.
Hot reload — code changes visible immediately in the app.
Code sharing with web — business logic can be shared with a Next.js website.
Maturity — in production use at Facebook, Instagram, Airbnb, Microsoft Teams.
React Native Disadvantages
JavaScript–native bridge — despite improvements, still slower than Flutter for heavy graphics.
Fragmentation — different behaviour on iOS and Android requires Platform.OS conditions.
Third-party library dependency — many features require external native modules.
Flutter
Created by Google in 2017. Uses Dart — Google's own language.
How Does It Work?
Flutter doesn't use native UI components. It draws EVERY pixel itself through its own rendering engine (Skia/Impeller). The app looks identical on iOS and Android.
Flutter Advantages
Performance — 60fps (or 120fps on Pro) guaranteed. No JS bridge.
Pixel-identical UI — the app's appearance is 1:1 on every platform and device.
Hot reload and hot restart — fast development loop.
Dart — a simple, strongly-typed language. Easy to learn for Java/C# developers.
Excellent documentation — Google invests heavily in the ecosystem.
Multi-platform — iOS, Android, Web, macOS, Windows, Linux from one codebase.
Flutter Disadvantages
Dart — a niche language. Fewer developers on the market.
App size — the built-in rendering engine adds +5–10 MB.
Non-native UI — Flutter widgets look great but don't look like native iOS/Android. For some users, this is a concern.
Google's track record — Google has a habit of killing projects (Stadia, Glass, etc.), though Flutter is very actively maintained.
Comparison: React Native vs Flutter
| Criterion | React Native | Flutter |
|---|---|---|
| Performance | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| Ecosystem | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ |
| Talent market | ⭐⭐⭐⭐⭐ | ⭐⭐⭐ |
| Learning curve | ⭐⭐⭐⭐⭐ (JS) | ⭐⭐⭐ (Dart) |
| Native UI feel | ⭐⭐⭐⭐ | ⭐⭐⭐ |
| Code sharing with web | ⭐⭐⭐⭐⭐ | ⭐⭐ |
| Animations | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
| Documentation | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ |
When to Choose React Native?
✅ You have a web team (React/JavaScript) — faster onboarding ✅ You want to share logic with a web application ✅ The project needs many integrations (maps, BLE, camera, payments) ✅ Business app that doesn't require special effects ✅ Developer availability in the talent market matters
Examples: Retail app, delivery platform, B2B business app, customer portal
When to Choose Flutter?
✅ Performance and smooth animations are important ✅ The app has its own, consistent design system (not mimicking iOS/Android) ✅ Target: iOS, Android AND desktop from one codebase ✅ You have developers with Dart/Flutter experience ✅ Fintech, light gaming, apps with custom UI
Examples: Fitness app with animations, fintech, internal desktop+mobile tools
How Much Does a Mobile App Cost?
React Native
| Scope | Cost | Timeline |
|---|---|---|
| MVP (5 screens) | €4,000 – €7,000 | 6–10 weeks |
| Business app | €8,000 – €16,000 | 3–5 months |
| Complex platform | €16,000 – €40,000+ | 5–12 months |
Flutter
Similar costs — the main difference is developer availability and rates (Flutter can be 10–20% more expensive due to a smaller talent pool).
Our Recommendation
For most projects: React Native.
Reasons:
- More developers → lower cost and easier to find talent
- JavaScript/TypeScript → if you have a web project, one team handles everything
- Mature ecosystem → fewer problems with native integrations
- Very good performance for typical business applications
We choose Flutter when: the app requires very smooth animations, a consistent custom UI, or we're targeting desktop at the same time.
Alternatives Worth Considering
Expo (on top of React Native) — dramatically speeds up the start, great for MVPs. Limitations with advanced native features.
Capacitor + Ionic — for projects where you have a web team and care about fast time-to-market. Won't match RN/Flutter in performance.
Summary
There's no wrong answer — both React Native and Flutter are mature, production-ready frameworks used by the world's largest companies.
At Soft Synergy we primarily use React Native but have delivered Flutter projects too. We choose technology for the project — not the other way around. In a free consultation we'll help you choose the right solution for your project.