SubstrateUI is an open-source design system and component library tailored for Next.js projects. It features 70+ components, OKLCH color tokens, Tailwind CSS v4 support, and Radix UI primitives. Developers can quickly build visually consistent UIs with built-in dark mode and Storybook documentation.
SubstrateUI is a Frameworks & SDKs product. It focuses on accelerating the development of visually consistent Next.js apps with a ready-made design system and components. It is built as an open-source project for frontend developers. SubstrateUI is open source under the MIT license. It runs on the web, and it can be self-hosted.
SubstrateUI first shipped in 2026. Development happens publicly on GitHub with 92 commits in the last 90 days. PulseGate's similarity index finds few close equivalents — SubstrateUI occupies a relatively distinct niche. Key capabilities include design system, component library, and next.js integration. SubstrateUI is currently in beta.
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