Impeccable

Impeccable is a design skill system that helps AI coding tools produce better frontend interfaces by giving them a richer design vocabulary. It provides one comprehensive skill, multiple commands, and curated reference files covering typography, color, motion, spacing, interaction, responsive design, and UX writing. The project is built to counter common AI-generated design habits such as generic SaaS layouts, overused fonts, nested cards, weak hierarchy, and predictable gradients. It can be installed across several AI coding environments, including Claude Code, Cursor, Codex, Gemini CLI, GitHub Copilot, and others. Impeccable also includes deterministic anti-pattern detection through a CLI and browser extension without requiring an API key. It is most useful for developers and designers who want AI-generated interfaces to feel more polished, intentional, and product-aware.