Cross-platform mobile development is becoming increasingly popular, with Flutter and Kotlin Multiplatform emerging as leading solutions. Flutter, developed by Google, utilizes the Dart language and offers a reactive framework with a vast array of widgets, allowing for fast development and a consistent UI across platforms. It is especially beneficial for creating MVPs due to its quick iteration and hot reload capabilities. However, learning Dart and managing larger app sizes can be challenging. Kotlin Multiplatform, introduced by JetBrains, leverages Kotlin's popularity and allows for shared business logic across platforms while using native UI components, offering native performance and modular integration without requiring a complete codebase overhaul. Although Kotlin Multiplatform is newer and some features remain in beta, it is gaining traction among developers who prioritize native performance and have existing native apps. Ultimately, the choice between Flutter and Kotlin Multiplatform depends on the specific needs of the development team, with Flutter being ideal for rapid development and cross-platform consistency, and Kotlin Multiplatform being suitable for projects that require native performance and integration. Both tools continue to coexist as viable options in the cross-platform development landscape.