Copy-Paste Components vs npm Packages: shadcn/ui vs Ninna UI in 2026

The React component library debate used to be straightforward: pick an npm package, install it, use it. Then shadcn/ui arrived and proposed something radical: don't install components - copy them into your codebase. Two years later, both approaches have proven themselves in production. This article is an honest comparison of the copy-paste model (shadcn/ui) and the npm package model (Ninna UI) - examining the trade-offs that matter at scale. The Two Models shadcn/ui: Copy-Paste You run a CLI command that copies React component source files directly into your project. The components use Radix UI primitives and Tailwind CSS for styling. You own every line of code. npx shadcn@latest add button dialog select This creates files in your components/ui/ directory. They're yours. Modify them freely. Ninna UI: npm Packages You install packages from npm. Components are consumed as imports. You customize via CSS custom properties, Tailwind utilities, and data-slot CSS selectors - without modifying