Platform Design

A practical reference when you're building apps that need to look native on iOS, Android, and web without maintaining three separate design systems. It bundles 300+ rules extracted from Apple's Human Interface Guidelines, Material Design 3, and WCAG 2.2 accessibility standards. The value here is consolidation: instead of context-switching between official docs while designing buttons, spacing, or touch targets, you get cross-platform guidance in one place. Most useful during early design phases when you're establishing patterns, less so if you're already deep in platform-specific polish. The upstream repo from @ehmo suggests this is actively maintained, though you'll want to verify the rule coverage matches your specific platform targets before committing to it as your primary reference.

skills.sh installs: 2.9K
GitHub stars: 106.9K
last updated: Aug 21, 2026

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Install

$ npx -y skills add nexu-io/open-design --skill platform-design --agent claude-code

Installs into .claude/skills of the current project.

Files

platform-design

Curated from @ehmo.

What it does

300+ design rules from Apple HIG, Material Design 3, and WCAG 2.2 for cross-platform apps. Useful when shipping a single design across iOS, Android, and the web.

Source

Upstream: https://github.com/ehmo/platform-design-skills
Category: design-systems

How to use

This catalogue entry advertises the skill in OpenDesign so the agent discovers it during planning. To run the full upstream workflow with its original assets, scripts, and references, install the upstream bundle into your active agent's skills directory:

# Inspect the upstream README for exact paths
open https://github.com/ehmo/platform-design-skills

Then ask the agent to invoke this skill by name (platform-design) or with one of the trigger phrases listed in this skill's frontmatter.

SKILL.md on GitHub

Details

Repository: github.com/nexu-io/open-design
Categories: Mobile Development, Design & UI/UX
First seen: Jun 3, 2026