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21st AI

by 21stYC W26No ratings yet

Generate and compare several UI component designs from a prompt

Visit 21st.dev

Linked from 21st.dev · checked 30 Oct

Tool type
AI UI-component generator
Made for
Developers and designers building web interfaces
Runs on
Web sandbox, MCP and CLI
Last checked
30 Oct 2026
1 product sources

What it does

21st AI drafts user-interface components from a written request or an existing community component. A generation produces several alternatives side by side, so you can compare the results and refine the one that fits. Code mode creates React and shadcn components in a live sandbox; Sketch mode produces editable HTML for a faster visual draft.

You can copy the component or its prompt into your project, or use the same account through supported agents, MCP and the 21st command-line tool. Generation uses credits from a paid Builder + AI plan, while browsing the library is free. The output starts in a separate sandbox rather than automatically understanding and modifying the whole application. Check accessibility, responsive behavior, dependencies and fit with your existing design system before integrating it.

What it can do

  • Multiple design variations
  • React and shadcn generation
  • HTML sketches
  • Community-component remixing
  • Iterative editing
  • Code and prompt export

Works with

  • Cursor
  • Claude
  • VS Code
  • Codex
  • Windsurf

Before you choose

  • Monthly AI allowances reset; purchased top-ups roll over.
  • Generated components need integration and accessibility checks in the target project.

Listed under

Get started

  1. Choose a Builder + AI plan and describe the desired component.
  2. Compare the generated alternatives and refine a selected version.
  3. Copy the code or prompt into your project and review the integration.
Draft a component with 21st AI

Plans and prices

Prices in USD

Builder + AI starts at $15/month equivalent on annual billing. Plans include 500, 1,000 or 2,000 monthly credits; 100-credit top-ups cost $5.

Builder + AI entry plan$15/moMonthly equivalent billed annually.
  • 500 monthly credits

Source: 21st.dev/ai, checked 30 Oct 2026. Prices can change; check before you buy.

Sources for this overview

Product pages, documentation, and pricing checked 30 Oct 2026. Each source supports part of the overview; availability and prices can change.

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What’s changed

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Signals

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Data and security

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Training on your files, compliance, hosting and the models behind it. Free with an account.

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Prices, platforms and features against similar tools, with sources. Free with an account.

Where this comes from

How we research
Company website
21st.dev: product, pricing and policy pages
YC directory mirror
Batch and company name
Social accounts
Accounts the company links, and its posts on X
Human review
Checked by a person
knowledge_base
manual_review

Last checked 30 Oct 2026. Every field keeps its source and date; unknown means we couldn’t confirm it.