styled-components

Emotion is a flexible and performant library designed for writing CSS styles with JavaScript. It provides a powerful and predictable style composition in addition to a great developer experience with features such as source maps, labels, and testing utilities. Emotion allows for writing styles using string or object notation and supports both styled components and the css prop for styling elements. Its framework agnostic nature means it can be used with various frameworks or even without one, making it a versatile choice for styling modern web applications.

Stitches is a CSS-in-JS styling framework with near-zero runtime, server-side rendering (SSR) support, and multi-variant capabilities. It provides a powerful way to define and use design tokens, making it easier to maintain consistent styling across large applications. Stitches offers features like automatic critical CSS extraction, which can significantly improve initial load times. Its variant API allows for creating complex component variations with minimal code. Stitches also provides excellent TypeScript support, offering type safety for styles and themes. Its performance-focused approach and developer-friendly API make it a popular choice for projects where styling performance and flexibility are crucial.

JSS (JavaScript Style Sheets) is an authoring tool for CSS that allows developers to use JavaScript to describe styles in a declarative, conflict-free, and reusable way. It provides a more powerful abstraction over CSS, enabling the use of JavaScript's full expressiveness in style definitions. JSS supports features like dynamic styling, theming, critical CSS extraction, and vendor prefixing. By bringing the power of JavaScript to CSS authoring, JSS offers increased maintainability and flexibility in styling complex applications, particularly useful in component-based architectures.