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Flutter is an open-source UI toolkit developed by Google. It allows developers to create beautiful interfaces for multiple platforms using a single codebase. Flutter uses the Dart programming language and provides a wide range of widgets that enable fast development and high performance.
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Flutter is a UI toolkit for building applications for mobile, web, and desktop from a shared Dart codebase.
Flutter was developed at Google to build interfaces for multiple target platforms from one codebase. It responds to the complexity of separate UI stacks and to the need for consistent presentation, fast iteration, and direct control over the presentation layer. Dart provides the language, while widgets provide the modular description of the UI.
Think of Flutter as a tree of small, reusable widgets. The code describes the desired UI state, not individual pixels. When data changes, Flutter rebuilds the affected parts, computes layout and rendering, and outputs the result for the target platform. Native capabilities can be added through platform integration when needed.
The interface is assembled from small building blocks that can be combined and reused.
The code describes what the interface should look like; Flutter derives the presentation from it.
Changes in data cause relevant parts of the interface to be rebuilt.
Code changes become visible quickly in the running app without restarting the whole process.
When needed, Flutter connects to system features or native code on the target platform.
Flutter is especially useful when a team wants to serve multiple platforms with one shared UI, iterate on prototypes quickly, or keep interface behavior highly consistent. The advantage of a shared codebase can be offset by extra build and maintenance work when deep native integration, large dependencies, or platform-specific edge cases dominate.
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