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.
21st Reviews
The community submitted 7 reviews to tell us what they like about 21st, what 21st can do better, and more.
5.0
Based on 7 reviews
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Reviews praise 21st.dev for saving time and simplifying frontend work with a broad set of high‑quality, free components, including 3D. Developers highlight smooth React and Next.js use, easy integration with other tools, and strong fit for AI-driven workflows. Designers appreciate intuitive, stylish results and a collaborative community. Creators on the platform report tangible benefits and expect it to become a preferred source over traditional UI libraries. Users ask for preview features, versioning clarity, and expanded support for custom contributions as the platform grows.
+4
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