Kotlin

Typed application programming languageOpen source· verified Sep 2026

A language with Java interoperability and coroutine support, used for native Android apps and other application targets. Pair it with Jetpack Compose for Android UI.

Official site

Reach for it when

Native Android apps
JVM applications and asynchronous application logic

Worth knowing

Apache-2.0 licensed. Kotlin Multiplatform is a separate architectural choice; using Kotlin in an Android app does not automatically share its UI with iOS.

In stack playbooks

Native Android — Kotlin + Jetpack Compose

Application logic and asynchronous work

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