As of 2025, the default rendering engine for Flutter on iOS is still Skia. Skia is a 2D graphics library that Flutter uses to render UIs consistently across different platforms, including iOS. It provides low-level graphics rendering and ensures smooth performance for Flutter applications.
While Apple has its own graphics framework called Metal, Flutter abstracts this out and uses Skia on top of Metal for rendering on iOS. This allows Flutter to maintain a consistent rendering pipeline across platforms, including Android, iOS, and web.
In short, Skia continues to be the default rendering engine, and it interfaces with the platform’s native graphics system (like Metal on iOS and Vulkan/OpenGL on Android) to draw UI elements.
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