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.

The PH Community (ph) is a forum and resource hub for PHP developers, providing discussions, tutorials, and insights on PHP programming and web development. Developers can ask questions, share knowledge, and collaborate with fellow PHP enthusiasts on topics such as PHP frameworks, CMS platforms, and database integration. Additionally, PH Community covers PHP events, job opportunities, and community initiatives, fostering a supportive and engaged PHP developer community.

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21st.dev is a React component registry for AI applications serving 1.4M developers. Their latest launch, the 21st Agents SDK, lets developers define AI agents in TypeScript, deploy with a single command, and embed a production-ready chat UI. The SDK includes built-in streaming, session management, usage billing, and observability. The platform also offers UI components, agent templates, and managed infrastructure, backed by Y Combinator (W26).

21st: Infra and UI building blocks for the agentic internet