Flutter is better than React Native for app development because of its fast development cycle, stateful hot reloads, and the ability to use a single codebase to develop apps for both iOS and Android efficiently. Flutter uses Dart, a language with types that has both JIT-based compilation and an Ahead-of-Time compiler that emits efficient ARM code for fast startup and predictable performance of production deployments. Flutter also offers better developer productivity, object-orientation, predictable and high performance, and fast allocation compared to React Native.

Dart is a highly productive language that saves engineering resources by letting developers create apps for both iOS and Android with the same codebase. The vast majority of developers have experience with object-oriented development, making it easier to learn how to develop with Flutter. Furthermore, Flutter empowers developers to create fast, fluid user experiences with a language that delivers high and predictable performance without periodic pauses that may cause dropped frames. Flutter also relies heavily on efficient memory allocation that depends heavily on the underlying memory allocator, which languages without this facility may not handle well.

Furthermore, Dart has been optimized for Flutter to allow for the production of predictable and high-performance native binaries, achieving fast startup times and predictable performance. Flutter's core engine is only 3.4 MB (compressed) for ARM32 and 4.0 MB (compressed) for ARM64, making it smaller than React Native. As a result, Flutter is a better option for cross-platform app development.

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