# 21st — Infrastructure and UI building blocks for the agentic internet

```yaml
url: "https://forg.to/companies/21st"
website: "https://21st.dev"
industry: "SaaS"
company_size: "1-10 employees"
headquarters: "San Francisco, USA"
is_hiring: false
open_roles: 0
verified: false
created: 2026-07-23
```

## About 21st

21st.dev is the largest React component registry for AI applications, used by 2M developers (370K 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.

## Links

- Website: https://21st.dev
- Forg: https://forg.to/companies/21st

---
Listed on [Forg](https://forg.to) — the professional network for builders

_HTML version: https://forg.to/companies/21st_