Technology Overview
What Is Flutter?
Flutter is an open-source UI toolkit from Google for building natively compiled applications for iOS, Android, web, and desktop from a single Dart codebase — with a distinctive rendering engine that draws every pixel itself.
How Flutter Works
Flutter does not use native UI components (unlike React Native). Instead, it includes its own rendering engine — Impeller on modern devices, Skia on older ones — that draws every pixel of the UI directly onto a canvas provided by the platform. This means your app's UI looks identical on iOS, Android, and any other platform Flutter targets.
Dart, Flutter's programming language, compiles to native ARM or x64 machine code for mobile and desktop, and to JavaScript for web. There is no JavaScript bridge at runtime — Flutter communicates with native APIs through platform channels, a lightweight binary messaging protocol.
Dart Language
Dart is a strongly-typed, sound null-safety language with async/await, generics, and excellent tooling.
Custom Rendering Engine
Impeller renders Flutter widgets at 60 or 120fps independently of the host platform's widget system.
Widget Tree
Everything in Flutter is a widget — layout, styling, animation, and interactivity are all composed from widgets.
Strengths of Flutter
Pixel-Perfect Consistency
The same UI code renders identically on iOS, Android, and web — no platform differences to design around or test separately.
High-Performance Animations
60 or 120fps rendering with complex custom animations that would be difficult to achieve with native UI components.
Fully Custom UI
Flutter's widget-first approach makes it ideal for apps with non-standard designs that don't fit platform UI patterns.
Single Codebase, All Platforms
Target iOS, Android, web, macOS, Windows, and Linux from a single Flutter project.
Sound Null Safety
Dart's null safety catches null pointer errors at compile time, significantly reducing runtime crashes.
Hot Reload
See changes in your app UI instantly during development without losing app state — dramatically faster iteration.
Limitations to Consider
- → Dart learning curve: Dart is a less widely-known language than JavaScript. Teams without Dart experience need to invest time in learning it.
- → App size: Flutter apps include the rendering engine, which increases the baseline app size compared to native apps (typically 5–10MB overhead).
- → Platform-specific feel: Because Flutter renders its own widgets, achieving perfectly platform-native styling (e.g. iOS vs Material) requires deliberate effort.
Flutter at Elmeris
Elmeris builds Flutter applications for clients who need pixel-perfect custom design, multi-platform reach, or high-performance animations. Our Flutter projects use Bloc or Riverpod for state management, Dio for networking, and Codemagic or GitHub Actions for CI/CD.
Building with Flutter?
Tell us about your app and we'll recommend the right framework for your needs.
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