impeccable: Why Every AI-Generated UI Looks the Same, and 17 Commands to Fix It

Build a landing page with Claude Code. Build a dashboard with Cursor. Build a SaaS homepage with Windsurf. They all look the same. Inter font. Purple gradients. Cards nested inside cards. Gray text on colored backgrounds. Every LLM learned from the same training data, so without guidance they reproduce the same predictable mistakes. impeccable fights that bias with explicit anti-patterns, 7 domain-specific reference files, and 17 steering commands. Source: impeccable — Paul Bakaus (ex-Google Chrome DevRel) "Don't Do This" Beats "Do This" for LLMs The project's core insight. Telling an LLM "create good design" is weaker than telling it "never use Inter font." Anti-patterns force the model off its default path, which triggers more deliberate choices. Explicit anti-patterns include: overused fonts (Inter, Arial, system defaults), gray text on colored backgrounds, pure black/gray without tinting, cards nested inside cards, and bounce/elastic easing (which reads as dated). Each anti-pattern