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What Is Flutter?
Flutter UI Toolkit
Flutter is Google's open-source toolkit for building natively compiled applications for mobile (iOS and Android), web, and desktop from a single Dart codebase. It uses a custom rendering engine instead of native UI components, giving you pixel-perfect control across platforms.
How Flutter Works
Flutter doesn't use native UI widgets — it draws everything with its own rendering engine (Skia/Impeller). This means your app looks identical on iOS and Android. The widget system is declarative: compose small widgets into complex UIs, similar to React's component model.
Hot reload lets you see changes in under a second without losing app state. Flutter's performance is near-native because it compiles to ARM machine code. Google uses it for Google Pay, BMW uses it for their app, and it's the most popular cross-platform framework.
Why Developers Use Flutter
Flutter is the leading choice for cross-platform mobile development in 2026. It's ideal for teams that need iOS and Android apps from one codebase with near-native performance and consistent UI across platforms.
Key Concepts
- Widgets — Everything in Flutter is a widget — buttons, layouts, padding, even the entire app. Compose them like building blocks.
- Hot Reload — See code changes instantly without losing application state — dramatically speeds up development
- Custom Rendering — Flutter draws its own UI instead of using native components — identical appearance across platforms
- Dart Language — Flutter's programming language — fast compilation, null safety, and async/await built in
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Frequently Asked Questions
Flutter vs React Native?
Flutter has better performance (custom rendering), consistent cross-platform UI, and hot reload. React Native leverages existing JavaScript/React skills and uses native UI components. Flutter for pixel-perfect cross-platform; React Native for leveraging web skills.
Can Flutter build web apps?
Yes, Flutter supports web compilation. But for web-first projects, traditional web frameworks (React, Next.js) provide better SEO, performance, and ecosystem support.
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