Carbon Design System is described as 'Carbon is IBM’s open source design system for products and digital experiences. With the IBM Design Language as its foundation, the system consists of working code, design tools and resources, human interface guidelines, and a vibrant community of contributors' and is an app. There are more than 10 alternatives to Carbon Design System for a variety of platforms, including Self-Hosted, React, Web-based, JavaScript and Figma apps. The best Carbon Design System alternative is Semantic UI, which is both free and Open Source. Other great apps like Carbon Design System are UIkit, Material UI, Mantine and Chakra UI.