Is Kotlin for Android only?

Get started with Kotlin/JVM

Yes. Kotlin is 100% interoperable with the Java programming language and major emphasis has been placed on making sure that your existing codebase can interact properly with Kotlin. You can easily call Kotlin code from Java and Java code from Kotlin.

Reason #4 — Kotlin is Multi-Platform “Kotlin is no longer just for developing android apps .” Yeah! You read that right. Though Kotlin was created keeping JVM in mind, which means it can only be used on any device that runs on JVM.