21st

Infra and UI building blocks for the agentic internet

5.0•6 reviews•

2.7K followers

Infra and UI building blocks for the agentic internet

5.0•6 reviews•

2.7K followers

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Engineering & Development

21st.dev is the largest React component registry for AI applications, used by 1.4M developers (200K MAU). We provide the building blocks to create AI agents and agent-powered apps: UI components, agent templates, and an SDK with built-in UI, tools, memory, observability, and managed infrastructure.