aid: 21st
name: 21st
description: >-
  21st (21st.dev) is a Y Combinator-backed company building an open, community-driven
  registry of crafted React, Next.js and Tailwind CSS UI components, plus the tooling to
  generate and consume them with AI. Its flagship product, Magic MCP, is an AI agent that
  drops into Cursor, Windsurf, Cline, VS Code and Claude Code to generate production-ready
  UI components from natural-language prompts. The platform also ships a remote hosted MCP
  server, the @21st-dev/cli terminal client, a private component registry CLI, published
  Agent Skills, and the @21st-sdk toolkit for building, deploying and embedding AI coding
  agents. Founded by Serafim Korablev and Sergey Bunas, 21st lets teams bring craft and
  taste back to digital products and build UIs that reflect their own design vision rather
  than generic LLM output.
url: https://raw.githubusercontent.com/api-evangelist/21st/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-17'
image: https://21st.dev/opengraph-image.png
tags:
- Company
- UI Components
- React
- Model Context Protocol
- Developer Tools
- AI
- Agents
- Design Systems
- Frontend
- Component Registry
apis: []
common:
- type: Website
  url: https://21st.dev
- type: DeveloperPortal
  url: https://21st.dev
- type: Documentation
  url: https://docs.21st.dev
- type: GettingStarted
  url: https://21st.dev/magic
- type: Blog
  url: https://21st.dev/blog
- type: Pricing
  url: https://21st.dev/pricing
- type: SignUp
  url: https://21st.dev/magic/console
- type: TermsOfService
  url: https://21st.dev/terms
- type: PrivacyPolicy
  url: https://21st.dev/privacy
- type: GitHubOrganization
  url: https://github.com/21st-dev
- type: ChangeLog
  url: changelog/21st-changelog.yml
- type: MCPServer
  url: mcp/21st-mcp.yml
- type: Packages
  url: packages/21st-packages.yml
- type: SDKs
  url: packages/21st-packages.yml
- type: CLI
  url: cli/21st-cli.yml
- type: LLMsTxt
  url: llms/21st-llms.txt
- type: Authentication
  url: authentication/21st-authentication.yml
- type: DomainSecurity
  url: security/21st-domain-security.yml
- type: AgentSkill
  url: skills/_index.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence