21st
UI building blocks for the agentic internet
Community-submitted · content unverified. This organization has not verified ownership or the information in this profile.
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. 21st is a Y Combinator company (Winter 2026). YC-listed status: Active.
- Website
- 21st.dev
- Location
- San Francisco, CA, USA
- Added via
- web
- Ownership
- unclaimed
Where to go
Products
- 21st.dev — Community registry of 12,000+ React UI components and templates designed for AI coding tools. · Marketplace · Freemium
Links
- Y Combinator profileycombinator