21st.dev is answering right now. Last checked 6 min ago.
Find UI components and themes, retrieve code, and generate with hosted 21st AI when enabled.
Nothing serious here today
Today is the operative word: we check 21st.dev every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Connect this server
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 6 min ago.
claude mcp add mcp --transport http https://21st.dev/api/mcp{
"mcpServers": {
"mcp": {
"url": "https://21st.dev/api/mcp"
}
}
}[mcp_servers.mcp]
url = "https://21st.dev/api/mcp"{
"mcpServers": {
"mcp": {
"url": "https://21st.dev/api/mcp"
}
}
}{
"mcpServers": {
"mcp": {
"url": "https://21st.dev/api/mcp"
}
}
}This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.
Endpoints
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://21st.dev/api/mcp | streamable-http | sign-in | 65 ms | 6 min ago |
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21st.dev — questions
Answers built from our own checks of this server.