Cross-Platform Development: Flutter vs React Native vs Kotlin Multiplatform
A practical comparison of the three main cross-platform options for Android and iOS development in 2025. Which one should you pick for your next project?
If you're building a mobile app in 2025 and want to target both Android and iOS, you have three serious options: Flutter, React Native, and Kotlin Multiplatform. Each takes a different approach, and each has trade-offs that matter depending on what you're building.
Flutter is Google's UI toolkit. It ships its own rendering engine, meaning your app looks and behaves identically on both platforms. You write once in Dart and get consistent pixel-perfect UI everywhere. The trade-off is that Dart is not a mainstream language and the app bundles are slightly larger. Flutter is the right choice when UI consistency matters and you want one team handling everything. It has strong tooling, a mature ecosystem, and real production adoption.
React Native takes a different approach. You write in JavaScript or TypeScript, which means most web developers can pick it up quickly. It bridges to native components, so the app looks and feels more native than Flutter on each platform. The downside is the bridge can introduce performance issues, and the framework has a history of breaking changes. Meta has stabilised things with the New Architecture, but React Native still has more rough edges than Flutter in my experience.
Kotlin Multiplatform is not a full app framework. It lets you share business logic written in Kotlin between Android, iOS, and the web, while each platform handles its own UI. This appeals to teams with existing native expertise who want to reduce duplication without committing to a full cross-platform approach. The limitation is that you still need platform-specific UI code, so it is less 'write once' and more 'share some logic across platforms'.
My recommendation: for most startups and small businesses, Flutter is the pragmatic choice. One codebase, one developer, two platforms, fast iteration. React Native makes sense if you have a large JavaScript team or need a very native feel. Kotlin Multiplatform is worth exploring if you already have separate Android and iOS teams and want to reduce backend duplication without changing your UI approach.
The honest answer is that all three work. The best one is the one your team can actually ship and maintain.
Written by
Shyam Kishor Pandit