Kotlin

Starting with IntelliJ IDEA 2025.1, K2 mode, a new implementation of Kotlin support, will be enabled by default. This change is an important step in the ongoing effort to improve Kotlin support in the IDE.  While this transition brings many improvements and lays the foundation for a smoother…

I'm Yan Zhulanow, and I lead the Kotlin Analysis API team. Last year, we made a series of announcements about Kotlin K2 mode in IntelliJ IDEA. Now, as K2 mode is about to become the default, I am thrilled to tell you more about everything we had to go through to make this release happen. Even bef…

The Kotlin 2.1.20 release is out! This version includes performance improvements and bug fixes for Kotlin 2.1.0. Here are some highlights from this release: K2 compiler updates: New default kapt compiler plugin. Kotlin Multiplatform: A new DSL to replace Gradle’s Application plugin in multipl…

The Kotlin 2.1.0 release is out! This version introduces new language features, tooling updates, performance improvements, and important fixes. Learn more!

Kotlin 2.0.20 has been released! This version includes performance improvements and bug fixes for Kotlin 2.0.0, where we announced the Kotlin K2 compiler as Stable. Learn more!

We're excited to release Kotlin 2.0 with a stable K2 compiler, which is fast, smart, and multiplatform.

Kotlin 1.9.20 has been released! Highlights include: Kotlin K2 for all targets is in Beta, and Kotlin Multiplatform is Stable. Learn more!

Kotlin 1.9.0 has been released! Highlights include: Kotlin K2 for JVM is in Beta, other K2 compiler updates, new enum class values function, new operator for open-ended ranges, preview of Gradle configuration cache in Kotlin Multiplatform, changes for Android target support in Kotlin Multiplatform, preview of custom memory allocator in Kotlin/Native. Learn more!

The first experimental version of the Kotlin Notebook plugin for IntelliJ IDEA is now available! This post will offer insight into the plugin’s functionality and use cases, but before launching into that, we’d like to let the plugin speak for itself: https://youtu.be/2PLYlDJPelQ W…

Kotlin 1.8.20 has been released! Highlights include: Kotlin K2 compiler updates, AutoCloseable interface and Base64 encoding in stdlib, new JVM incremental compilation enabled by default, new Kotlin/Wasm compiler backend. Learn more!

New experimental functions for JVM, Improved kotlin-reflect performance, New -Xdebug compiler option, and more.

To make sure that all scenarios and project types are tested with the new Kotlin version, we’re starting the EAP Champions program – we invite you to join!