Latest news
September 10, 2025
Kotlin 2.2.20 Released
The Kotlin 2.2.20 release is out, delivering important changes for web development. Kotlin/Wasm is now Beta, with improvements to exception handling in JavaScript interop, npm dependency management, built-in browser debugging support, and a new shared source set for js and wasmJs targets. Additionally, here are some main highlights: For the complete list of changes, see […]
August 29, 2025
ICPC World Finals Livestream: ecnerwala and SecondThread Speed-Solving Kotlin Challenge
Join us live from the ICPC World Finals in Baku, Azerbaijan, for a special event. This year, we are hosting a head-to-head match where two of the world’s top competitive programmers, Andrew ‘ecnerwala’ He and David ‘SecondThread’ Harmeyer, will speed-solve Kotlin problems in real time. Save the date: September 2, 2025, at 9:30 am UTC […]
August 28, 2025
Koog 0.4.0 Is Out: Observable, Predictable, and Deployable Anywhere You Build
Featuring Langfuse and W&B Weave Support, Ktor Integration, Native Structured Output, iOS Target, GPT-5, and More. Koog 0.3.0 was about making agents smarter and persistent. Koog 0.4.0 is about making them observable, seamlessly deployable in your stack, and more predictable in their outputs – all while introducing support for new models and platforms. Read on […]
August 27, 2025
Exploring Data Science With Kotlin: A Powerlifting Case Study
This is a guest post from Adele Carpenter. Adele is a Software Engineer and Consultant at Trifork Amsterdam, where she works on educational systems in the Kotlin/Java/Spring ecosystem and advises customers on their projects. TL;DR This blog post uses a dataset from the sport of powerlifting to get you up and running with Kotlin Notebooks, […]
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
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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.
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Kotlin Foundation
