Flutter is a framework that allows developers to create native mobile and desktop apps with one codebase. It uses a unified, stateless widget architecture to produce stunning UIs. It also has a number of features that enhance time-to-market and app refinement.
Its most critical feature is hot reload, which enables changes to be made in real-time and shown in the app (often within milliseconds). This is a significant advantage over other development tools, especially when working with designers and testers who can change UI components quickly.
Another key feature is Dart, which has a fast development cycle with hot reload (it can be enabled by executing flutter run in debug mode). It provides a highly flexible syntax and is supported by IDEs that are built on the same engine, providing consistency across platforms. Dart’s runtimes and compilers provide a JIT-based fast development cycle, and an Ahead-of-Time compiler produces efficient ARM code for production deployment.
At the heart of flutter is the flutter engine, which runs your Dart code on your device to render the UI. The engine implements a platform’s API and interfaces with the underlying operating system to access services like rendering surfaces, accessibility, and input. The engine also exposes an emulator for rapid emulation of the target platform, making it easy to test apps in an emulator or on a physical device before they’re released to the App Store or Google Play Store.