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21st

Infrastructure and UI building blocks for the agentic internet 

Company Size

1 - 5 employees

Year Founded

2024

About 21st

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.

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Founders & Key People

Sergey Bunas

Sergey Bunas

Founder, 21st

Serafim Korablev

Serafim Korablev

CEO / co-founder, 21st

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