Kotlin
Concise. Multiplatform. Fun.
fun main() {
val name = "stranger" // Declare your first variable
println("Hi, $name!") // ...and use it!
print("Current count:")
for (i in 0..10) { // Loop over a range from 0 to 10
print(" $i")
}
}Kotlin
Concise. Multiplatform. Fun.
fun main() {
val name = "stranger" // Declare your first variable
println("Hi, $name!") // ...and use it!
print("Current count:")
for (i in 0..10) { // Loop over a range from 0 to 10
print(" $i")
}
}Kotlin
Concise. Multiplatform. Fun.
Multiplatform
Go cross‑platform without compromising performance, UX, or code quality.
AI development
Leverage AI models tailored for Kotlin, backed by JetBrains' open data, benchmarks, and tooling built into your workflow.
Backend
Build fast applications with Spring or Ktor. Kotlin's expressiveness makes backend code a pleasure to write and maintain.
Android
Write less boilerplate, ship more features with the official language of Android development since 2019.
Kotlin Tour
fun main() {
val name = "stranger" // Declare your first variable
println("Hi, $name!") // ...and use it!
print("Current count:")
for (i in 0..10) { // Loop over a range from 0 to 10
print(" $i")
}
}
Latest news
June 30, 2026
Kodee’s Kotlin Roundup: Kotlin Turns 15, Kotlin 2.4.0, and the Kotlin Toolchain
Hi everyone! May and June brought so much Kotlin news that I needed a little extra space for this roundup. Kotlin turned 15, Kotlin 2.4.0 arrived with new capabilities for developers on every platform, and I found plenty of ways to learn, experiment, build AI agents and AI-powered applications, and explore useful Kotlin Multiplatform libraries. […]
June 29, 2026
Kotlin Notebook Sunset
Starting from IntelliJ IDEA 2026.2, JetBrains will sunset Kotlin Notebook as a product and will no longer maintain it. The plugin will remain available on an open-source model so the community can continue its development. Below, we explain why we’re making this change, how it affects current Kotlin Notebook users, what comes next, and how […]
June 24, 2026
Kotlin Toolchain 0.11: The Next Step for Amper
Amper 0.11.0 is out, and you will notice a shift in the product branding immediately. If you missed the KotlinConf keynote (watch the recording), here’s the headline: Amper has evolved into the Kotlin Toolchain and is now Alpha! This release brings that transition to life, alongside the ability to publish JVM libraries, new plugin development […]
June 3, 2026
Kotlin 2.4.0 Released
The Kotlin 2.4.0 release is out! Here are the main highlights: For the complete list of changes, refer to What’s new in Kotlin 2.4.0 or the release notes on GitHub. How to install Kotlin 2.4.0 The latest version of Kotlin is included in the latest versions of IntelliJ IDEA and Android Studio. To update to […]
fun main() {
val name = "stranger" // Declare your first variable
println("Hi, $name!") // ...and use it!
print("Current count:")
for (i in 0..10) { // Loop over a range from 0 to 10
print(" $i")
}
}Kotlin in action
Share code on your terms and for different platforms
Kotlin + AI
JetBrains is investing in AI models tailored for Kotlin, providing open data, benchmarks, and AI-native tooling integrated into your workflow.
At the same time, Kotlin makes it easy to build your own AI-powered features with seamless backend integrations and a growing ecosystem.
What you get with Kotlin + AI
- Strong support across JetBrains AI tools like AI Assistant and Junie
- Robust functionality for building AI-powered apps on the JVM
- Native integration with tools like Spring AI and LangChain4j
- Open data and benchmarks for better code generation
Build your own AI agents with Koog
Koog is JetBrains’ new Kotlin-native framework for creating powerful AI agents that run locally, interact with tools, and automate complex tasks. Whether you’re developing a simple chat assistant or an advanced multi-step workflow, Koog gives you full control with clean Kotlin code – no external services are required. Build, extend, and experiment with AI agents entirely in Kotlin.
Get startedBig, friendly and helpful community
Kotlin Foundation
