Design Atlas
Type
component registry
Verdict
Very useful
Licence
Look only licence, not statednot-statedfree with a limit of 2 component copies per day; premium membership for unlimited copies and exclusive templates. Installed code stays "in your repo, as your code," with no runtime package of its own.
Agent channels
mcp, cli, api
Pricing
freemium
Reviewed

← Atlas · Topics: components, agents-and-prompts, inspiration

21st.dev ​

Type
component registry
Verdict
Very useful
Licence
Look only licence, not statednot-statedfree with a limit of 2 component copies per day; premium membership for unlimited copies and exclusive templates. Installed code stays "in your repo, as your code," with no runtime package of its own.
Agent channels
mcp, cli, api
Pricing
freemium
Reviewed

What it is ​

A community gallery and registry of React/Tailwind components, blocks and themes — the site states more than 12,000 components — with live previews and visible source code before installing. Many patterns have several distinct solutions side by side (e.g. ten different heroes) to compare styles before choosing.

When to open it ​

To find inspiration for a specific pattern (hero, pricing, dialog...) by seeing several real variants before deciding on a design, or to install an already-built block via CLI or MCP without leaving the editor.

Most useful ​

Categories by component type (heroes, pricing, testimonials, buttons, inputs, dialogs) and complete design-system themes. Direct integration with shadcn/ui primitives and with the design tokens of the project it's installed into.

Using it with agents ​

Built to be installed without leaving the editor:

  • CLI: npx @21st-dev/cli@latest init --client <cursor|claude|codex|vscode|devin>
  • MCP server (https://21st.dev/api/mcp) with tools: search (catalog, free), get_component (source code, paid), get_inspiration (suggestions matched to the project's stack), search_logo (SVG logos) and generate (create new components from a prompt)
  • Markdown endpoints and an OpenAPI 3.0 spec aimed at agents

Watch out for ​

Search is free, but pulling the source code of a specific component may require payment depending on the plan. Since it's a community-open registry, accessibility quality and maintenance vary by author; check the licence of each individual component or template, since authors retain ownership and can sell templates on their own.

Reusable ideas ​

  • Compare several solutions to the same pattern before settling on a final design, instead of going with the first option
  • Give an agent an "inspiration matched to your stack" tool instead of a generic catalog
  • Publish your own blocks as an internal registry reusable across projects, shadcn-style

shadcn/ui, Magic UI, Aceternity UI, VibePrompts, The Component Gallery