Every “Flutter vs React Native” article is written by someone who clearly prefers one over the other. I wanted actual data, so I spent two weeks building the exact same app in both frameworks and measured everything.
The Test App
I built a task management app with these features: user authentication, CRUD operations for tasks, offline storage, push notifications, a camera feature for attaching photos, and animations. This covers most common mobile app requirements.
Development Speed
React Native took me about 55 hours total. Flutter took 48 hours. The difference was mostly in UI building – Flutter’s widget system is faster once you get used to it because you’re not switching between JSX and stylesheets.
However, I already knew JavaScript well and had to learn Dart for Flutter. If you’re starting from scratch with both, the difference would be smaller.
Performance Comparison
| Metric | React Native | Flutter |
|---|---|---|
| App startup (cold) | 1.8s | 1.2s |
| List scroll (1000 items) | 58 FPS | 60 FPS |
| Animation smoothness | Occasional drops | Consistently smooth |
| APK size | 28 MB | 22 MB |
| RAM usage (idle) | 180 MB | 155 MB |
Flutter wins on raw performance. The compiled Dart code runs closer to native than React Native’s JavaScript bridge. That said, for most apps, users won’t notice the difference.
Developer Experience
React Native pros:
- JavaScript/TypeScript ecosystem is enormous
- Hot reload works great (Flutter’s does too)
- Easier to find developers who know JavaScript
- Can share logic with web apps
Flutter pros:
- Dart is genuinely pleasant to write once you learn it
- Widget-based UI is more consistent across platforms
- Built-in Material Design and Cupertino widgets look great
- Better documentation overall
The Ugly Parts
React Native’s biggest pain point was native module compatibility. I spent 4 hours debugging a camera library that didn’t work with the latest React Native version. The ecosystem fragmentation is real.
Flutter’s biggest pain point was the widget tree depth. Complex UIs become deeply nested and hard to read. Also, the Dart ecosystem has fewer third-party packages than JavaScript, so sometimes you have to build things yourself.
My Verdict
If your team already knows JavaScript and you need to ship fast: React Native.
If you’re starting fresh and want the best performance and UI consistency: Flutter.
If you’re a solo developer: try both for a week and see which one feels right. The “best” framework is the one you’re productive in.