New Claude Code Skill Brings Professional Mobile App UI Design Principles to Developers

Open-Source Skill Codifies Design Systems from Leading Apps

A new GitHub repository, ceorkm/mobile-app-ui-design, publishes a Claude Code skill that packages mobile app UI/UX best practices into a reusable framework. The skill draws on documented patterns from Airbnb, Duolingo, Spotify, Revolut, and Phantom, aiming to move developers beyond functional screens toward interfaces described as "intentional, smooth, personal, and alive."

What the Skill Covers

• Five-step design process — from context gathering to final polish
• Industry-specific conventions — patterns for nine-plus sectors including AI, crypto, finance, and health
• Emotional design principles — Peak-End Rule (from Nobel Prize research), feedback loops, and strategic interaction patterns
• Design systems — typography hierarchy (max four sizes, two weights), 60/30/10 color rule, 8-point grid spacing
• Implementation guidance — React, Tailwind CSS, and component patterns for React Native, Flutter, and SwiftUI

Automatic Triggers

According to the repository, the skill activates when a user asks Claude to:

• Improve an existing mobile app design
• Build React Native, Flutter, or SwiftUI interfaces

Practical Implications

Developers can copy the skill files into `~/.claude/skills/mobile-app-ui-design/` and immediately apply:

• Visual design rules for typography, color, spacing, and shadows
• Industry-specific design languages
• Micro-interaction CSS transitions
• A four-phase client-work process with line-numbered navigation

The maintainers also note that screens designed with the skill can serve as App Store or Google Play screenshots, and mention a companion tool, ASO Shots, that generates headline copy, offers three style directions, and exports images at platform-required sizes.

Licensing and Contributions

The project is released under the MIT License. Contributions are welcome via pull requests. Design principles are attributed to "industry best practices, research papers, and case studies from leading design teams" without naming specific internal documents.

How to Verify

• Visit the repository: `https://github.com/ceorkm/mobile-app-ui-design`
• Review the README for the full feature list and installation steps
• Check the license file for usage terms
• Open issues or submit pull requests for improvements

Unknowns

• No release date or version number is published in the source text
• Adoption metrics and community size are not disclosed
• The relationship between this skill and any official Anthropic offering is not clarified