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21st

21st.dev

UI building blocks for the agentic internet

B2BWinter 2026
Batch
Winter 2026
Team size
3
Region
United States of America
Status
active

Detail

Batch
Winter 2026
Industry
B2B
Region
United States of America
Status
active
Team size
3
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Summary

21st.dev is the largest React component registry for AI applications, used by 2M developers We provide the building blocks to create agent-powered apps: UI components, agent templates.

Source

Public startup directory

Last updated Nov 5, 2026

Imported automatically — not verified by the company.

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