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 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” […]
May 7, 2026
Kotlin Ecosystem Mentorship Program: Results and Winners
In the Kotlin Ecosystem Mentorship Program pilot, mentors and mentees worked together on real Kotlin open-source projects to make their first meaningful community contribution. Four pairs successfully completed the two-month program, and one eligible pair was randomly selected in the prize drawing to receive the grand prize – a trip to KotlinConf 2026 in Munich! […]
May 4, 2026
Kodee’s Kotlin Roundup: Golden Kodee Finalists, Kotlin 2.4.0-Beta2, and New Learning Resources
Hi everyone! April brought exciting community news with the announcement of the Golden Kodee finalists, along with Kotlin and tooling releases, multiplatform progress, and fresh backend resources. I also came across the new Kotlin Professional Certificate on LinkedIn Learning, which is a great way to build your skills. And if you want something more playful, […]
April 29, 2026
Next-Level Observability with OpenTelemetry
This tutorial was written by an external contributor. As a developer, logging is usually the first technique that you reach for when something goes wrong in your application. You add a few log statements at the start and end of a function and in the exception handlers, and then you get a basic picture of […]
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
