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.
Products used by 21st
Explore the tech stack and tools that power 21st. See what products 21st uses for development, design, marketing, analytics, and more.
Productivity 1
Productivity 1
Engineering & Development 2
Engineering & Development 2
