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21st

Infrastructure and UI building blocks for the agentic internet
San Francisco , US
21st.dev is the largest React component registry for AI applications, used by 2M developers (370K 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.
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Founded2024
Team Size3
LocationUS
Website21st.dev
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