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21st.dev Magic UI Builder

by 21st-dev

Describe a UI component and get one built from a curated modern component library.

Design Systems & UI Component Libraries
Summary
Generating from a curated library beats generating from nothing, and that is the real difference here.

A model asked to write a component from scratch produces something plausible and inconsistent with everything around it. Drawing from a maintained set of pieces means the output shares conventions with itself, which is most of what "looks designed" means. The preview matters more than it sounds: UI is the one thing you cannot evaluate by reading the diff. Note the API key goes on the launch line, so it lands in whatever config file you keep that in.

What it is

A component generator wired into the editor: you describe what you want in words and it produces a modern, typed component, drawing on a library of pre-built pieces rather than inventing from scratch.

What you get
  • Components generated from a natural-language description
  • A library of pre-built, customisable components to draw from
  • Real-time preview as the component takes shape
  • TypeScript throughout
  • A collection of brand assets and logos available alongside
Requirements

An API key, passed on the launch line. Integrations exist for the main editors. MIT licensed.

Setup effort

One command plus a key — npx @21st-dev/cli@latest init --client cursor # or: claude | vscode | windsurf | codex, then supply credentials