Tachyons vs. Radix UI
By SW Habitation
Tachyons
Radix UI
You know how building a website can feel like a lot, especially when you’re trying to style every little thing yourself? Buttons, forms, layouts… it adds up fast. That’s where UI frameworks really save the day. They give you a bunch of premade design elements that you can just drop in and go. It’s like having a design starter pack that helps your site look clean and professional, without spending forever tweaking the details.
What isTachyons?
Tachyons is a functional/atomic CSS framework that uses small, reusable utility classes. Instead of big UI components or deeply nested CSS, Tachyons encourages developers to style elements using many tiny, single-purpose classes.
Let's check by the example,
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<button class="f6 link dim br3 ph3 pv2 mb2 dib white bg-dark-blue">
Click Me!
</button>Here, each class f6, br3, ph3 controls a specific CSS property like font size, border radius, padding, etc. This modular approach makes styling predictable and reusable.
Tachyons was one of the innovator of the utility-first CSS movement—it influenced modern frameworks like Tailwind.
Key Features of Tachyons
- Atomic CSS Classes: Every class does one thing (e.g., pa3 = padding).
- Responsive Utilities: Classes adapt to multiple screen sizes.
- Small Bundle Size: Around 14KB minified & gzipped.
- Performance-Oriented: Encourages minimal CSS output.
- Accessible Defaults: Typography and spacing built for readability.
- Framework-Free: Works with plain HTML, React, Vue, or any frontend.
- Rapid Prototyping: Compose UIs quickly with utility classes.
Advantages of Tachyons
- Stable: Mature and widely battle-tested since 2015.
- Highly Composable: Mix classes freely to achieve complex designs.
- Consistent: Predictable, reusable naming system.
- Fast & Lightweight: Tiny CSS footprint.
- Great for Prototypes: Quickly test ideas without writing custom CSS.
- Utility-First Approach: No deep CSS overrides needed.
Disadvantages of Tachyons
- Smaller Community: Fewer themes, templates, and ecosystem resources.
- Messy HTML: Can lead to class-heavy markup that’s harder to read.
- No Components: You must build everything (buttons, navbars, modals) manually.
- Learning Curve: Class names (pa3, f5) are shorthand and non-intuitive for beginners.
- Not Actively Maintained: Less frequent updates compared to newer frameworks.
What is Radix UI?
Radix UI is a modern component library offering headless, unstyled, and accessible primitives for React. These primitives include tooltips, dialogs, dropdowns, switches, and more, giving you full control over their design and behavior.
It's built for developers who want to create custom design systems without reinventing the wheel.
Key Features of Radix UI
- Unstyled Components: You bring your own styles using any CSS method.
- Accessibility First: Meets WCAG standards and handles focus management, keyboard support, ARIA, etc.
- Composability: Designed to work well in any React component structure.
- Animation Support: Works well with animation libraries like Framer Motion.
- Cross-browser Consistency: Tested across all major browsers.
- TypeScript Support: Full typings for all components.
Advantages of Radix UI
- Total design freedom, you're not tied to any design system.
- Accessibility is handled for you out-of-the-box.
- Works with Tailwind, Emotion, Styled Components, or vanilla CSS.
- Ideal for teams building a component library or design system.
- Tree-shakable, import only what you need.
Disadvantages of Radix UI
- No styles included, you must build your own from scratch.
- Longer time to build complete UIs compared to styled libraries.
- Slightly higher learning curve for accessibility and composition.
- Not ideal for beginners who want fast results.
Comparison Between Tachyons vs Radix UI
Use Cases of Tachyons
- Rapid prototyping and MVPs.
- Building custom UIs without depending on pre-styled components.
- Designers who want total control over design instead of prebuilt themes.
- Developers who like atomic/functional CSS.
- Lightweight projects where performance is critical.
Use Cases of Radix UI
- Custom design systems and UI kits
- Accessibility-first enterprise apps
- Complex UIs needing fine control (e.g., advanced modals, tooltips)
- Developers who prefer full styling freedom
- Applications requiring granular component logic and behavior
Other Resources
Conclusion
UI frameworks make building a polished website way easier. Whether you're working on something simple or a big project, they help you get things looking just right without having to stress over every little design decision. With ready-to-use components, responsive layouts, and modern styles, you can build faster and smarter.
So, pick one that works for you, and start creating a site that looks amazing from the get-go.
Frequently asked questions
How do I start using Tachyons?
Include via CDN, install with npm, or build a custom version with PostCSS.
What makes Tachyons different?
Tachyons is utility-first and functional using small, single-purpose classes combined directly in HTML.
How big is Tachyons?
Very lightweight, under 14 KB gzipped, and you can slim it down further by removing unused modules.
Can I customize Tachyons?
Yes, through custom builds, CSS variables, or tools like Components AI for theming.
Is Tachyons enough for UI development?
Yes, many developers build full, responsive, and accessible UIs using only Tachyons plus basic CSS knowledge.
Is Radix UI a UI library or just logic?
It's a headless UI library that provides unstyled, accessible primitives like Dialog, Tooltip, Tabs, etc.
Is Radix UI styled?
No. It leaves styling completely up to you — use Tailwind, CSS modules, or styled-components.
Does Radix UI support dark mode?
Yes, but it depends on your implementation — it doesn’t manage themes out-of-the-box.
Is Radix UI accessible?
100%. It strictly follows WCAG and ARIA best practices.
Is Radix UI React-only?
Yes. It only works with React (and supports TypeScript out-of-the-box).