Col
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Libraries

21st.dev

21st.dev

A marketplace of production-ready React components built by the community, installable in one command.

Visit websiteDocsSource

Free + paid. Browsing is free with a daily limit on free component copies; unlimited copies, premium templates and 21st AI need a paid subscription. Pricing

Community collection. Anyone can publish to the registry, so components come from many community authors and terms can vary from one component to the next.

Setup

21st.dev publishes the current install commands and prerequisites in its own docs, so this page only points at them.

Read the official 21st.dev docs for prerequisites, installation, and current APIs.

Browse the official 21st.dev site and choose what to use.

Agent setup prompt

Send your agent to the current official docs.

Read the current official docs / llms.txt at https://21st.dev, then install from there.
Use 21st.dev in this existing project and follow those setup pages step by step: Col publishes no install commands of its own, so take every command, prerequisite, and version from them and cite the pages you used.
Keep the project's existing conventions, preserve accessibility, and report anything the official docs do not cover.

Integrations