Is jetpack compose multi platform?

Follow this tutorial if you need to install JDK 11 and IntelliJ IDEA.

Compose for Desktop Features Excellent AWT and Swing interoperability. Code sharing with Jetpack Compose Android applications via Kotlin Multiplatform . Android Compose compatibility at the UI element level.

Compose Multiplatform , by JetBrains Compose Kotlin UI framework port for desktop platforms (macOS, Linux, Windows) and Web, components outside of the core Compose repository at https://android.googlesource.com/platform/frameworks/support.

Yes Kotlin can be used to write desktop applications (but then might D or Rust be even better); no Kotlin is not just for Android apps. As other posters have mentioned, JVM apps can run most places, including the desktop. Also, Kotlin has a version that uses llvm called Kotlin/Native.