Make Claude stop building AI-looking apps: the 3-install setup

From @learningwithcole. Free, open source, and every link is the real repo. Lots of copycat versions exist, so only install from these links.

#1. Impeccable: design rules that catch "AI slop"

By Paul Bakaus (creator of jQuery UI) · github.com/pbakaus/impeccable (opens in a new tab) · 85K+ ★ · Apache-2.0

1 skill, 24 commands, and 62 detector rules for AI-generated frontend design. Overused fonts, gradient text and cards-in-cards get flagged before you ship.

npx impeccable install

Then run /impeccable init inside Claude Code.
Or, as a Claude Code plugin: /plugin marketplace add pbakaus/impeccable, then open /plugin and install Impeccable from the list.

#2. Emil Kowalski's skills: motion and polish

By Emil Kowalski (author of Sonner and Vaul) · github.com/emilkowalski/skills (opens in a new tab) · 49K+ ★ · MIT

15 skills distilled from Emil's design-engineering rules, including:

• "Never use ease-in for UI animations."
• "UI animations should stay under 300ms."
• "Never animate keyboard-initiated actions."

npx skills@latest add emilkowalski/skills

#3. Playwright MCP: Claude can see what it built

By Microsoft · github.com/microsoft/playwright-mcp (opens in a new tab) · 38K+ ★ · Apache-2.0

Claude opens your site in a real browser, clicks around, takes screenshots and resizes to phone width. Then it fixes what it actually sees.

claude mcp add playwright npx @playwright/mcp@latest

#The prompt I run after installing all three

Audit this page with Impeccable and list the top 5 issues.
Fix them, following Emil Kowalski's animation rules.
Then open it with Playwright at 390px and 1440px wide, screenshot both,
and fix anything that still looks off. Repeat once.

Honest note: skills guide Claude, they don't replace taste. Review the result, and give Claude a reference site you love.