Platform Design
Apply 300+ cross-platform rules from Apple HIG, Material Design 3, and WCAG 2.2 when designing one UI system for iOS, Android, and web.
Overview
platform-design is an agent skill most often used in Build (also Validate, Ship) that applies 300+ Apple HIG, Material Design 3, and WCAG 2.2 rules for cross-platform apps.
Install
npx skills add https://github.com/nexu-io/open-design --skill platform-designWhat is this skill?
- 300+ curated design rules spanning Apple HIG, Material Design 3, and WCAG 2.2
- Cross-platform focus for iOS, Android, and web in one design pass
- Open Design catalogue entry with triggers: platform design, Material Design, HIG rules, WCAG rules
- Upstream bundle at ehmo/platform-design-skills for full assets and scripts
- Mode design-system / category design-systems in Open Design metadata
- 300+ design rules from Apple HIG, Material Design 3, and WCAG 2.2
Adoption & trust: 816 installs on skills.sh; 61.4k GitHub stars.
What problem does it solve?
You are shipping one product on iOS, Android, and web but lack a shared rulebook for platform-native patterns and accessibility.
Who is it for?
Indie builders defining or auditing a cross-platform design system before or during UI implementation.
Skip if: Brand-only marketing pages with no app surfaces, or teams that already maintain a locked internal design system with no cross-platform gap.
When should I use this skill?
User mentions platform design, cross platform design, Material Design, HIG rules, or WCAG rules—or when shipping one design across iOS, Android, and web.
What do I get? / Deliverables
You align screens and components with documented HIG, Material 3, and WCAG constraints so design decisions stay consistent across platforms.
- Cross-platform design recommendations aligned to HIG, Material 3, and WCAG
- Component and pattern compliance notes
Recommended Skills
Journey fit
Spans multiple journey phases - primary shelf plus alternate fits below.
Canonical shelf is Build because the skill is a design-system rule set you apply while implementing UI, even though it informs earlier scoping. Frontend is the right subphase for HIG, Material 3, and WCAG guidance that ships in client surfaces.
Where it fits
Before building clickable mocks, pull HIG and Material spacing/touch-target rules so the prototype matches shipping constraints.
While implementing navigation and forms, verify components against Material 3 and HIG patterns for each target platform.
Pre-release pass on contrast, focus order, and heading-like structure using WCAG 2.2 rule references.
How it compares
Skill-packaged design rule catalogue, not a Figma plugin or automated visual diff tool.
Common Questions / FAQ
Who is platform-design for?
Solo builders and small teams shipping mobile plus web who need authoritative HIG, Material, and WCAG guidance in the agent loop.
When should I use platform-design?
Use it in Validate when scoping UI for a prototype, in Build while implementing components and layouts, and in Ship when checking accessibility before release.
Is platform-design safe to install?
The Open Design entry is documentation-forward; install the upstream bundle only from trusted sources and review the Security Audits panel on this Prism page before copying skills into your agent.
SKILL.md
READMESKILL.md - Platform Design
# 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 Open Design 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: ```bash # 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.