Impeccable

Impeccable is presented as a design vocabulary for agents. According to the page, it helps agents build interfaces from scratch, improve existing ones, and stay consistent with a design system. The page lists installation support for Codex CLI, Claude Code, GitHub Copilot, Cursor, Gemini CLI, Grok Build, Antigravity, OpenCode, Pi, and Hermes Agent. It describes a CLI installer, project initialization with /impeccable init, and optional automatic design checks via hooks, plus a Chrome extension and automated checks for pull requests. It also mentions commands such as polish, audit, typeset, distill, and layout, and files PRODUCT.md and DESIGN.md for recording product context and visual rules. Pricing is not stated on the page in explicit terms, though testimonials describe it as free.

Key features

• Installs as a skill for multiple AI coding tools via npx impeccable install or npx skills add
• Initializes project context with /impeccable init and enables design checks with /impeccable hooks on
• Detector with 62 checks that catch common AI design defaults and report findings to the agent
• Command set including polish, audit, typeset, layout, distill, clarify, and others
• Records product context in PRODUCT.md and visual system in DESIGN.md
• Reads existing codebase tokens and components to build within the current design system
• Chrome extension that finds design issues on a page via DevTools panel
• Automated checks in pull requests with CLI findings and exit codes
• Live Mode for picking page elements and steering edits in a running app

Best suited for

• Developers using AI coding agents to build frontend interfaces
• Teams wanting to keep agent-generated UI consistent with an existing design system
• Designers and developers reviewing and refining AI-generated UI
• Teams running design checks in pull request workflows

Pricing

Not stated on the website