Kotlin

Concise. Multiplatform. Fun.

Get started

Developed by

Latest news

May 22, 2025

KotlinConf 2025 Unpacked: Upcoming Language Features, AI-Powered Development, and Kotlin Multiplatform Upgrades

Last updated: May 28, 2025 With 2.5 million developers worldwide using Kotlin, the language continues to thrive and evolve. From exciting language and ecosystem updates and robust AI tools that empower Kotlin development to major Kotlin Multiplatform milestones and a strategic partnership for the backend, KotlinConf 2025 brought a wave of news that set the […]

May 22, 2025

Strengthening Kotlin for Backend Development: A Strategic Partnership With Spring

At JetBrains, we see Kotlin as a strong foundation for modern backend development, not just because of its technical strengths, but also because of how it helps developers build reliable, maintainable systems more efficiently. As part of our continued efforts to make Kotlin a top choice for professional server-side work, we’re excited to announce a […]

May 22, 2025

Meet Koog: Empowering Kotlin Developers to Build AI Agents

We’ve got some exciting news for the Kotlin Community! At this year’s KotlinConf, we’re introducing Koog, an innovative, open-source agentic framework that empowers developers to build AI agents within the JVM ecosystem using a modern Kotlin DSL. We designed Koog to provide developers with the tools they need to create intelligent, autonomous agents with the […]

May 21, 2025

Qodana Case Study: How JetBrains Kotlin QA Scaled Quality for Kotlin 2.0

When we prepared to release IntelliJ IDEA support for Kotlin 2.0, a major milestone for their compiler and ecosystem, their QA team faced a formidable challenge: how to ensure consistent, reliable quality across a complex and evolving codebase without slowing down development. With the Kotlin compiler, IDE plugin, and numerous inspections being refactored and rewritten, […]

Kotlin blog

Why Kotlin?

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")
    }
}

Get started

Kotlin in action

McDonald's leverages Kotlin Multiplatform (KMP) for their global mobile app, enabling them to build a codebase that can be shared across platforms, removing the need for codebase redundancies.Kotlin Multiplatform

AWS opted for Kotlin over Java for Amazon Quantum Ledger Database (QLDB) thanks to its expressiveness and structured concurrency. They rewrote QLDB in Kotlin, enhancing the user experience, benefiting from its development workflow, and adopting it fully for server-side development.Server-side

Philips utilizes Kotlin Multiplatform in its HealthSuite digital platform mobile SDK. With KMP, they accelerated the implementation of new features and fostered increased collaboration between Android and iOS developers.Kotlin Multiplatform

Adobe Experience Platform chose Kotlin for server-side development because of its concise syntax, async capabilities, and interoperability with Java. This shift boosted productivity and improved the developer experience, replacing Java for real-time services.Server-side

By sharing over 80% of logic across iOS and Android, Forbes now rolls out new features simultaneously on both platforms, keeping the flexibility to withhold or customize features based on the specific platform.Kotlin Multiplatform

Atlassian adopted Kotlin for the Jira Software cloud, leveraging its Java compatibility for seamless integration and minimizing migration challenges. Kotlin's ease of use improved developer productivity and boosted team satisfaction and efficiency.Server-side

Share code on your terms and for different platforms

Simplify the development of cross-platform projects with Kotlin Multiplatform. It reduces time spent writing and maintaining the same code for different platforms while retaining the flexibility and benefits of native programming. Kotlin applications will work on different operating systems, such as iOS, Android, macOS, Windows, Linux, watchOS, and others.

Learn about Kotlin Multiplatform

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

Learn about JetBrains AI Build AI apps with Kotlin

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 started

Big, friendly and helpful community

Kotlin has great support and many contributors in its fast-growing global community. Enjoy the benefits of a rich ecosystem with a wide range of community libraries. Help is never far away — consult extensive community resources or ask the Kotlin team directly.

Kotlin Foundation

Actively supports community efforts in developing the Kotlin ecosystem.

Learn more

Start using Kotlin today!

Get started