
21st.dev is highly praised for its ease of use and robust support for design-tool integration, particularly with Next.js. Users appreciate its smooth functionality, the availability of 3D components, and the ability to integrate with AI tools. The platform is noted for simplifying UI development by providing a centralized space for high-quality, reusable components, which saves time and effort. The community aspect adds significant value, and there is interest in potential features like preview functionality and custom component contributions.