Ever wanted to share code between your Android app, iOS app, backend service, and web frontend without compromise? Kotlin’s official repository houses the compiler that makes this dream reality. While other cross-platform solutions force you into lowest-common-denominator APIs, Kotlin gives you full native performance and platform-specific features when you need them.
This isn’t just another language compiler - it’s a complete multiplatform toolchain with mature support for JVM bytecode, Android DEX, native binaries, JavaScript, and WebAssembly. The compiler generates truly native code for each target, meaning your shared business logic runs at full speed everywhere. With 52K+ stars and backing from JetBrains, the tooling ecosystem is world-class: seamless IDE integration, comprehensive debugging, and build system plugins for Gradle and Maven.
Whether you’re an Android developer tired of reimplementing the same logic in Swift, a backend engineer wanting to share models with frontend teams, or building the next generation of truly cross-platform applications, this is where it all starts. The getting-started experience is surprisingly smooth - you can have shared code running on multiple platforms in under 30 minutes.
⭐ Stars: 52291
💻 Language: Kotlin
🔗 Repository: JetBrains/kotlin