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The open-source tool ai-design-check breaks down the "AI look" into 70+ countable check rules (spacing grid, type scale, gradient buttons, emoji icons, 'Welcome back' greetings, etc.). It's zero-dependency, requires no AI or API key, runs on React/Vue/Svelte/HTML/SwiftUI/Jetpack Compose, and can be hooked into Claude Code so the agent automatically fixes design issues itself.