Mmcp.market

21st.dev MCP server

by 21st.dev·dev.21st/mcp·v1.0.1
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Find UI components and themes, retrieve code, and generate with hosted 21st AI when enabled.

B70/100grade B
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Safety scan
B70/100

full report

Adoption
New

Little public usage data yet

Reviews

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If you have run it, two minutes of your experience saves the next person an afternoon.

21st.dev tools

Tool list not cached yet. `describe` through the gateway fetches it live.

Public scan report

scanner v0.1.5 · 2026-09-19 · same rubric, same numbers if you re-run it

1 low
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 378ms (auth required)20/20
  • –Tool poisoningtools not inspected (endpoint requires auth); not countedn/a
  • Auth qualityOAuth resource metadata advertised on 40115/15
  • Maintenanceno repository listed3/15
  • Maintainer identityverified namespace with website, no repo4/10

Findings (1)

  • lowNo source repository listedmaint.no-repo
Overall 70/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

Install directly

claude mcp add --transport http mcp https://21st.dev/api/mcp
Add to Cursor

21st.dev: common questions

Is 21st.dev MCP server safe?
Mostly: it is graded B (70/100). Read the 21st.dev safety report
How do I install 21st.dev?
It runs remotely at 21st.dev. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.
Does 21st.dev need an API key?
No key to paste: it signs you in with OAuth when your client connects.
Is 21st.dev maintained?
The latest release is v1.0.1.
Is 21st.dev up?
100% of our last 7 checks got an answer. We check remote servers about four times a day.
What can I use instead of 21st.dev?
Servers from other publishers that do the same job: Ignite UI Theming MCP Server.

Alternatives to 21st.dev

Same job from other publishers: the closest match first, then the best rated.

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