Outside of a few one-time configuration items, there is NO platform-specific work required to get your app running on both Android and iOS. After the small learning curve to get up to speed on Dart and its use of Futures, the language is very familiar as a C# developer. Layout is very easy, because it's all code-based. There are a ton of available add-ons to increase functionality, and the community is VERY active.

A easy application for mobile developement with best features such as ,ease of development with “hot reload”, native OEM Widgets, shared code base and views for Android and iOS.