21st.dev for ChatGPT

dev.21st/mcp

Find UI components and themes, retrieve code, and generate with hosted 21st AI when enabled.

client:ChatGPT transport:streamable-http

Install 21st.dev in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://21st.dev/api/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs