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Kotlin Tutorial

What is Kotlin?

Kotlin is a modern, trending programming language.

Kotlin is easy to learn, especially if you already know Java (it is 100% compatible with Java).

Kotlin is used to develop Android apps, server side apps, and much more.

Start learning Kotlin now »

Examples in Each Chapter

Our "Try it Yourself" editor makes it easy to learn Kotlin. You can edit the code and view the result in your browser:


fun main() {
  println("Hello World")
Try it Yourself »

Click on the "Try it Yourself" button to see how it works.

We recommend reading this tutorial, in the sequence listed in the left menu.

Kotlin Exercises

Test Yourself With Exercises


Insert the missing part of the code below to output "Hello World".

 () {
  println("Hello World")

Kotlin Quiz

Learn by taking a quiz! This quiz will give you a signal of how much you know about Kotlin.

Take the Kotlin Quiz

Learn by Examples

Learn by examples! This tutorial supplements all explanations with clarifying examples.

See All Kotlin Examples

Download Kotlin

Download free Kotlin from GitHub: