21st
YC W26UI building blocks for the agentic internet
San Francisco, CA, USAFounded 20253 employees21st.dev
Team
3
Founded
2025
About
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.
Tags
SK
Serafim Korablev
CEO / co-founder @ 21st
SB
Sergey Bunas
Founder @ 21st
No open roles at this time.
