SKILL.md
Compose Multiplatform
Compose Multiplatform (CMP) and Kotlin Multiplatform (KMP) patterns for cross-platform UI. Loaded for projects with
org.jetbrains.composeplugin. Foundation:../compose-motion/SKILL.mdfor animation API; this file covers what's specific to writing one Compose codebase for Android + iOS + Desktop + Web.
KMP vs CMP - quick clarification
KMP (Kotlin Multiplatform) is the language and build infrastructure: shared Kotlin code compiled to JVM, Native (iOS, macOS, Linux, Windows), and Wasm. CMP (Compose Multiplatform) is the UI framework on top of KMP, built by JetBrains as a port of Jetpack Compose. You write a single Compose codebase in commonMain that runs on Android, iOS, Desktop (JVM), and Web (Wasm). Platform-specific code lives in androidMain, iosMain, desktopMain, wasmJsMain and is wired in via expect/actual declarations.