Sira is an open-source, customizable design system that ships as a TailwindCSS plugin providing ready-made component class names for building interfaces. It takes basic CSS written with Tailwind utility classes as input and outputs a compiled TailwindCSS plugin, so developers can write markup like <button class="btn solid success"> instead of composing utility classes by hand. The project is maintained by Ricco Xie under the riazer-lab organization on GitHub. It uses NodeJS, PostCSS, and the Tailwind compiler to generate the plugin, and the source code is released under the Apache License 2.0.
What is Sira?
Sira is an open-source design system and TailwindCSS component class name library created by Ricco Xie and the riazer-lab team. It accepts CSS written with Tailwind utility classes and outputs a compiled TailwindCSS plugin, letting you use component classes like btn solid success directly in your HTML. The library runs on NodeJS and uses PostCSS as its build tool, and it is distributed on npm as @sira-ui/tailwind and via jsDelivr CDN.
Key Features
- Brand customization — Theme colors are driven by CSS variables defined on the root element, and each component layer can override them, letting you match your own brand palette without recompiling.
- Light/dark mode — The library includes light and dark mode styling, switchable through your own theme class or by overriding the CSS variables.
- TailwindCSS plugin — Install it with one npm command (
npm install @sira-ui/tailwind) or load it via jsDelivr CDN, then use component classes directly in any HTML file. - CSS combination selectors — Components are organized as a layer using CSS combination selectors, keeping class names short and composable.
- Accessible by design — The stated goal is to provide a consistent and inclusive user experience, aligning with basic accessibility best practices.
- Open source and community-driven — The project is Apache-2.0 licensed, with contributions welcome via GitHub issues and pull requests.
Who is it for?
- Frontend developers working in TailwindCSS who want pre-built component classes instead of re-implementing buttons, alerts, and other UI primitives.
- Design system maintainers who need a customizable starting point and can override layer-level color variables to align components with their organization's brand.
- Rapid prototypers who want to drop a CSS link into a CodePen or a plain HTML page and instantly get consistent, accessible component styling.
What can you do with Sira?
- Style buttons and UI elements quickly: Apply
class="btn solid success"to any<button>element to get a solid success button without writing custom CSS. - Rebrand an existing Tailwind project: Import the plugin, then override the root CSS variables to change the entire component set's color scheme.
- Build accessible interface patterns: Use the component classes in your markup and rely on the library's inclusive design defaults rather than hand-rolling each state.
How does Sira work?
According to the repository's principle section, Sira uses PostCSS and the Tailwind compiler to convert basic CSS code written with Tailwind classes into a TailwindCSS plugin. The component CSS is organized using CSS combination selectors, and theme colors are applied via root-element CSS style variables that each layer can override. To develop locally, clone the repo, run pnpm install, and start the dev server with pnpm run dev.
FAQ
Is Sira free to use?
Yes, Sira is open-source software released under the Apache License 2.0, so you can use it in commercial and personal projects without licensing fees.
How do I install Sira?
Install it with npm install @sira-ui/tailwind in your Node project, or include the CSS file from jsDelivr CDN directly in your HTML. Then you can use component classes like btn in your markup.
What does Sira provide?
Sira provides a TailwindCSS plugin with component class names for building modern UI. It includes light/dark mode, customization through CSS variables, and a focus on accessibility.
Is Sira compatible with my existing Tailwind setup?
Sira is designed as a TailwindCSS plugin, so it works within Tailwind's build system. You can use it alongside your existing Tailwind configuration by importing the plugin.
Alternatives
- daisyUI — another Tailwind CSS component library with a different set of component classes.
- Ripple UI — a Tailwind-based UI library that inspired Sira (listed in the project's stack).
