sumui

sumUi is an open-source user interface library for building web applications. It provides a collection of reusable UI components and a reactive rendering model, with an emphasis on accessibility, performance, and theming. The library aims to reduce boilerplate by offering declarative components and a compact core API.

sumUi originated in a community-driven project in the mid-2020s. The framework is maintained on a public repository with contributors from diverse organizations and individuals. It is released under a permissive license and follows an open governance model, with discussion and decision-making conducted in public channels.

sumUi uses a component-based architecture with a lightweight reactive layer that updates the DOM on state changes. It includes a built-in store, a routing module, and a theming system based on CSS variables and design tokens. It supports TypeScript, server-side rendering, accessibility features such as keyboard support and ARIA attributes, and a plugin system for extensions.

Core components cover common UI needs, including buttons, inputs, forms, dialogs, cards, and navigation. The framework offers a responsive layout system and utility components, aims for interoperability with modern toolchains, and provides documentation and starter templates to help new projects begin quickly.

Reception has been positive within smaller development communities and startups, though the ecosystem remains smaller than that of larger frameworks. Critics point to a thinner ecosystem of third-party components and fewer mature tooling options. Development continues with an emphasis on accessibility, performance, and developer experience.