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Compose Multiplatform Patterns

A practical KMP/CMP pattern reference for shipping one Compose codebase across Android, iOS, Desktop and Web.

Dev & CodingAdvanced★ 298⑂ 25AI score 9/10Last updated: Jul 31, 2026

What it does

  • Teaches correct expect/actual usage for functions, classes and @Composable declarations.
  • Lays out the commonMain/androidMain/iosMain/desktopMain/wasmJsMain structure and the 80–95% shared-code target.
  • Clarifies cross-platform APIs (LocalDensity, LocalWindowInfo, BoxWithConstraints) versus Android-only ones (LocalConfiguration).
  • Covers Compose Resources for fonts/images/strings, bidirectional Compose ↔ SwiftUI/UIKit interop code, plus a candid "what does NOT work" list (iOS drawer swipe conflict, imePadding(), JVM-only APIs banned in commonMain).
  • Includes an anti-pattern table against reflection-based platform detection, leaking Context, and infinite coroutine animation loops.

Who it's for

  • Mobile/desktop engineers building with Kotlin Multiplatform + Compose Multiplatform.
  • Teams comfortable with Jetpack Compose but new to iOS or Wasm targets.
  • Developers embedding Compose screens into SwiftUI apps (or the reverse).

Examples

  1. "How do I split a share sheet between Android and iOS?" → get a ready expect fun openShareSheet plus both actual implementations.
  2. "Keyboard insets don't work on iOS" → the gotchas section explains imePadding() limits on iOS and the workaround.
  3. "I need window size in shared code" → use LocalWindowInfo.current.containerSize instead of Android-only LocalConfiguration.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/AThevon/genjutsu/HEAD/skills/_jutsu/compose-multiplatform/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the skills/_jutsu/compose-multiplatform folder from the GitHub repo AThevon/genjutsu into my ~/.claude/skills/compose-multiplatform/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/AThevon/genjutsu.git /tmp/genjutsu && mkdir -p ~/.claude/skills && cp -r /tmp/genjutsu/skills/_jutsu/compose-multiplatform ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal and clone the repo: git clone https://github.com/AThevon/genjutsu.git
  2. Create the skills folder: mkdir -p ~/.claude/skills
  3. Copy this skill: cp -r genjutsu/skills/_jutsu/compose-multiplatform ~/.claude/skills/
  4. Verify the bundled references/ files (e.g. cmp-interop.md) came along.
  5. To also use linked sibling skills (compose-motion, etc.), copy them all: cp -r genjutsu/skills/_jutsu/* ~/.claude/skills/
  6. Restart Claude Code, then ask something like "review my Compose Multiplatform module structure" to trigger the skill.
View source on GitHub ↗License: MIT