MCP.Market

21st.dev MCP server

online · 100% uptime
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.

B77/100grade B
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Safety scan
B77/100

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 v0.1.10 · 2026-10-02 · same rubric, same numbers if you re-run it

1 low
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 135ms (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 identityendpoint served from the registry-verified namespace domain8/10

Findings (1)

  • lowNo source repository listedmaint.no-repo
Overall 77/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How 21st.dev compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
77/100
higher than 50% of 48,243 servers
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
248 ms
faster than 59% of 30,027 servers

Install 21st.dev in Claude Code, Cursor or VS Code

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 (77/100). Read the 21st.dev safety report
How do I install 21st.dev?
It runs remotely at 21st.dev. Add it to Claude Code, Cursor, VS Code or Claude Desktop 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 28 checks got an answer. We check remote servers about four times a day.
How does 21st.dev compare with other MCP servers?
safety score 77/100 (higher than 50% of 48,243 servers); uptime 100% (of our recent checks; the typical remote server answers 100%); response time 248 ms (faster than 59% of 30,027 servers). Full comparison.