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
May 15, 2026
A New Default Project Structure for Kotlin Multiplatform
We are updating the default project structure for Kotlin Multiplatform projects to give modules clearer responsibilities, better align with conventions used by other build systems and frameworks, and reflect the changes in Android Gradle Plugin 9.0. You’ll see this project structure in newly created projects generated by our tools, in the official documentation, and in […]
May 15, 2026
Help Shape the Future of Kotlin in the Age of AI
AI is rapidly changing the way developers write, review, learn, and maintain code. Code completion, AI chat assistants, autonomous coding agents, and other tools are giving rise to new workflows almost every month. But one important question remains: How well do these tools actually work with Kotlin? We want to better understand how Kotlin developers […]
May 15, 2026
Compose Multiplatform 1.11.0 Is Now Available
A new release of Compose Multiplatform has landed, with improvements to the iOS and web experience and a refreshed approach to UI testing. Read on for the highlights, or for the complete list of changes, check out the What’s New. Get Started with Compose Multiplatform Native text input on iOS If you’ve wanted text fields […]
May 13, 2026
The Road to Name-Based Destructuring
TL;DR New “val inside parentheses” syntax is being introduced to allow for name-based destructuring. Additionally, new syntax with square brackets is being introduced for positional destructuring. Both are currently Experimental (enabled using the -Xname-based-destructuring=only-syntax compiler argument) and will become Stable in a future release. In the distant future, the behavior of the “val outside parentheses” […]
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
